[Rogue909]

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

 

[McMahan]

Wow that's very weird and never heard of this. I am a little stumped as well by what you wrote. To me it sounds like the fuel pump isnt sending enough fuel to the injectors as fast as it should thats why its taking long to start and another indicator to me is its loosing PSI real fast so that tells me the fuel pump isnt keeping the system primed. Personally I would just replace the fuel pump just out on general purpose and for peace of mind that if it doesnt fix it then that variable is out. Best of luck to you

Also check the injectors and fuel rails and fuel press regulator

 

[Naptime]

Fuel pump, change the filter too.

 

[Augie]

I'll be following this one.
My 6.0 Denali XL is doing the same thing. No other issues, exept for the crancking.
Let us know if you replace the fuel pump and if that fixes it for you. I believe it may be my fuel pump making it do that too.

Thx,
Augie

 

[MrShorty]

Disclaimer: I'm assuming your '05 uses a continuously circulating fuel system like my '98 does. I don't know the newer GMs well enough to know if GM came up with a different (probably returnless) fuel system design.

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

I mean no disrespect to your friend's dad, but when you put a fuel pressure gauge on it and you can see that the fuel pressure is that far below spec, that defines a fuel issue.

My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?

Not necessarily. KOEO (Key On Engine Off), the fuel pump will only run for a second or two to build up pressure. If you don't immediately start the engine, the pump will turn off and wait for you to start the engine.

As you've noted, the usual first suspect in a problem like this a faulty check valve. Other possibilities include just about any other fuel system leakage like a leaky injector or a leaking regulator.

A couple of further tests I would suggest:

If your '05 is wired like my '98, you can apply power to a lead that will feed power straight to the fuel pump and see how long it would take for the system to build up pressure.
Turn the key on and off several times while watching the fuel pressure. How many cycles of the key does it take to get the fuel pressure up to spec? From what I can gather from others, these engines need at least 45-50 psi to start. Spec, as you know is about 60 psi.

 

[bmxer360]

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

I have an 03 sierra 1500, its been in t

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

I have an 03 sierra 1500 5.3 doing the same thing. It's spent 6 months in the shop, every day they tinker with it and just gave up? The issue developed in the time they replaced the fuel pump and the knock sensors. Itll crank crank crank, poping out the exhaust the first time, sometimes. Then the 2nd will fire with no issues and always runs perfect, no cel. Fuel pressure is 54lbs every turn of the key. Sometimes it fires on first try. Weather doesn't affect it firing more often or not, totally random. If anyone has fixed this, that would be amazing to get help.

 

[RayVoy]

Let it sit over night, then in the morning spray a little gas or starter fluid into the throttle body, see if it starts any faster.
It it does, it's a fuel delivery problem
If there is no difference, it's probably a spark problem.

Let us know what happens.

 

[bmxer360]

Let it sit over night, then in the morning spray a little gas or starter fluid into the throttle body, see if it starts any faster.
It it does, it's a fuel delivery problem
If there is no difference, it's probably a spark problem.

Let us know what happens.

This morning the truck fired up first try. I went to the store, shut it off, came back, didn't fire on first try, fired on 2nd. It's so random, there is no pattern or anything that makes it better or worse. I live in redding, ca where there's a 100 degree differential from summer to winter and tempature doesn't affect it either. I'll give it a shot of ether in the morning and it'll either fire or wont.

 

[Kanode]

Any of you guys ever figure this out? I also have to turn my key twice about 2/3's of the time I try to start my truck. 2000 Silverado 5.3L. The problem started when I replaced the camshaft position sensor about a year ago. I replaced the camshaft position sensor because the truck wouldn't start at all. After I replaced it the truck started right up, but then the next time I had to crank twice and it's been this way ever since. My fuel pressure is normal. When I pulled the old camshaft position sensor out it was coated with sludge, so possibly there is more sludge on the new one. I've had regular oil changes and have run an engine flush through it before the last 2 oil changes.

 

[bmxer360]

Any of you guys ever figure this out? I also have to turn my key twice about 2/3's of the time I try to start my truck. 2000 Silverado 5.3L. The problem started when I replaced the camshaft position sensor about a year ago. I replaced the camshaft position sensor because the truck wouldn't start at all. After I replaced it the truck started right up, but then the next time I had to crank twice and it's been this way ever since. My fuel pressure is normal. When I pulled the old camshaft position sensor out it was coated with sludge, so possibly there is more sludge on the new one. I've had regular oil changes and have run an engine flush through it before the last 2 oil changes.

I just sold my truck to my buddy, he was willing to take on the issue because I or the shop couldn't figure it out. My issue started when the shop changed the fuel pump and the knock sensors. They went back through and replaced it all again. Still nothing.

 

[Cowboytrukr]

What’s your fuel pressure?

 

[Jaercole]

Maybe leaky fuel injector(s)?

 

[ezitpainting]

Any of you guys ever figure this out? I also have to turn my key twice about 2/3's of the time I try to start my truck. 2000 Silverado 5.3L. The problem started when I replaced the camshaft position sensor about a year ago. I replaced the camshaft position sensor because the truck wouldn't start at all. After I replaced it the truck started right up, but then the next time I had to crank twice and it's been this way ever since. My fuel pressure is normal. When I pulled the old camshaft position sensor out it was coated with sludge, so possibly there is more sludge on the new one. I've had regular oil changes and have run an engine flush through it before the last 2 oil changes.

Did you do relearn (after replacing ecu, cam or crankshaft sensor need to do relearn at dealer)>some BS at dealer updating your ECU ,cost $80-150.Let me know

 

[ezitpainting]

Any of you guys ever figure this out? I also have to turn my key twice about 2/3's of the time I try to start my truck. 2000 Silverado 5.3L. The problem started when I replaced the camshaft position sensor about a year ago. I replaced the camshaft position sensor because the truck wouldn't start at all. After I replaced it the truck started right up, but then the next time I had to crank twice and it's been this way ever since. My fuel pressure is normal. When I pulled the old camshaft position sensor out it was coated with sludge, so possibly there is more sludge on the new one. I've had regular oil changes and have run an engine flush through it before the last 2 oil changes.

I thing replacing ECU, cam or crankshaft sensor you need you go to dealer to update your ecu software called relearn variation or something like this .Let me know Thx

 

[Christopher2111]

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

 

[Christopher2111]

I'm having the same symptoms with my 2004 Suburban. Did anyone find a fix?

 

[DUSTING]

So my dad just purchased a used 2005 suburban (our last one was an 02 that we ran into the ground) and got a good deal on it...
As with all good deals it has its qwirks, but my dad and I are handy with a wrench (OK not perfect, but on a scale of 1-10 id rate us pretty good at figuring stuff out and getting things fixed) so we figured sure why not, its a suburban, they are tough, the person we bought it from was less then mechanically inclined so its probably something stupid. Besides, we got a deal on it (even if we lose some money on repairs we still end up ahead.)
Ok, dead end now.
Heres what happens... when you crank the truck it cranks strong, but you sit there and crank it and it never fires... until you let go and drop the key back to the run position then crank again. Then it fires like a champ.
First thought was the fuel pump, so we primed it (put key in run and wait....) then cranked, same story.
So we drove it around for a bit (150 miles) hoping to trigger a code pop, nothing.
Took it to a friends dad (a retired mechanic, he has a knack for motors) who told me it must be a sensor issue (his first guess was the crankshaft position sensor), replaced that and no dice. Same story.
Took it to a local shop, had them scan it with one of their super scanners, nothing popped up on the scanners as being irregular.
Gut feeling got the better of me so I picked up a fuel pressure gauge and tried that, now I got some weird numbers....
When you first put the gauge on it reads 0 (car is off).
When the car is switched to run it reads 0. (if im correct it should have pressure here)
When you start cranking the gauge will slowly start going up, if you let it raise all the way to 45-50 it will fire and start running like a champ.
If you stop cranking early (IE when the gauge is at 25~) then drop it to run and crank it again, fires right away.
Once the truck is running, solid 60psi the whole time its running (havnt driven it with gauge on, the gauge we got has a short hose (dumb selection in hindsight) so the hood has to stay open while you ahve the gauge).
When you kill the truck the gauge rapidly drops down to about 9psi (in approx 3 sec)
From there the gauge will slowly drop to 0 (takes about 30-45 sec)
If you attempt to start the truck while the gauge is dropping, it starts fine. If you let it hit 0 psi, start cranking.
It should be noted that once the truck is running it has no problems, instant acceleration (for a suburban anyway), smooth idling, etc. I drove it to class and ran errands yesterday (150 - 200 miles) without any problems.
I checked fuel pump relay, it looked alright, was a little brown on one side, went ahead and replaced it, no dice.
Ran Chevron fuel cleaner through, no change.

Now im confoundled. What would cause those symptoms?
My first thought would be a leaking fuel check valve, but the system depressurizes so fast, and even when its in run it should be priming right?
So then I thought maybe the fuel pump? But then it would show up during drives.
Regulator? The pressure stays a solid 60 once its started.
Line/Fuel Injector? MPG is too high to be "wasting" gas... 17.9 mpg (city65/hwy35)

Maybe its not a fuel issue at all? Friends dad swears its got nothing to do with fuel and its a sensor (I would think the scans would pop something there)

Some specs;
2005 Suburban
Z71
4x4
5.3
FlexFuel
110k miles

Anyone have any thoughts? Im desperate here >.<

Hello my name is Dustin and I am having the same issue with my 2000 suburban 5.3 liter v8. just had rear main seal done along with camshaft sensor, crakshaft sensor, fuel pump, fuel filter , new battery, 2 new fuel pressure regulators, and cleaned air mass sensor. Did you happen to find anything out concerning this problem? Im frustrated. love the truck other than this.

 

[RayVoy]

Hello Dustin, did this problem exist before all of the replacement parts; or did it start happening after the parts were changed?

 

[Jaercole]

Hello my name is Dustin and I am having the same issue with my 2000 suburban 5.3 liter v8. just had rear main seal done along with camshaft sensor, crakshaft sensor, fuel pump, fuel filter , new battery, 2 new fuel pressure regulators, and cleaned air mass sensor. Did you happen to find anything out concerning this problem? Im frustrated. love the truck other than this.

Look into leaking injectors. I had the same problem with my 99 Suburban 2500. It was leaking injectors.

 

[Christopher2111]

Look into leaking injectors. I had the same problem with my 99 Suburban 2500. It was leaking injectors.

Same issue with my 2004 suburban, I've checked the injectors, replaced camshaft sensor, checked fuel pump, fuel filter, fuel pressure regulator, and replaced knock sensor. However, after talking to my dealer a bad ignition switch can cause these symptoms. I will provide an update once I confirm whether or not this works