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08-27-2012, 06:34 AM #11
It is a 5 speed manual gearbox."It went together didn't it? Well then there has to be a way to take it apart!" - Me.
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08-27-2012, 09:27 AM #12
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- Mar 2012
- Lynden, WA
So the motor struggles a lot almost as if you were towing a HUGE load? I see you have changed almost everything related to fuel and spark. Have you watched the fuel injectors in the tbi unit spray fuel while it is running? I would make sure that they arent gummed up. If you have access to an exhaust backpressure gauge you can take out the upstream O2 and check your back pressure before the cat to see if it is too high. Or just cut out the cat. Since its a 95 with tbi this exhaust only has the upstream O2's that are before the cat right? If so then you dont actually need a cat
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08-27-2012, 11:09 AM #13
I took the downpipes and cat off today to see if that was a problem. Turns out that the cat has already been hollowed out by a previous owner. I can see from the rear of the pipe all the way to the o2 sensor.
All was not lost, though; I needed to replace the donut seals at the manifold anyway. The injectors seem to be spraying fine, although I know that you really can't tell by looking at them. I am going to disconnect them one at a time to see if the truck acts differently using one of them or the other.
Yes, it feels like there is a big load I am trying to pull along. A friend of mine says "Dude... It's not a 350. I understand that it is not a 350, and I realistically don't expect V8 power... So this isn't a case of unrealistic expectations...
Also, the inside of the exhaust pipe is heavily blackened and sooty. The truck runs rich (or has incomplete combustion maybe). I know this already because I can smell it. I just confirmed it today. Maybe another clue.
Last edited by moogvo; 08-27-2012 at 11:13 AM.
08-27-2012, 01:43 PM #14
Yeah buddy, no problem man! Hope you can get something figured out. It's a bummer having vehicle trouble... Diagnosis can often prove to be difficult. Best of luck man.
08-27-2012, 01:53 PM #15
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- Feb 2007
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Have you considered that it might be something later on in your drivetrain? Perhaps you're having transmission issues or something that's putting excess load on the engine.Christopher
1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
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08-27-2012, 06:26 PM #16
08-27-2012, 08:09 PM #17
Is the air intake unobstructed and a fresh filter in place? If it was carbureted I'd say look for a stuck choke.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
08-27-2012, 08:14 PM #18
09-02-2012, 11:52 AM #19
If the cats were hollowed out did the previous owner re tune ? Exhaust changes such as a hollowed out cat can change your a/f mapping. Could be running to rich in certain areas of the power band.2001 Burban 4x 5.3L
09-02-2012, 01:50 PM #20
I have found a happy middle point with the base timing that seems to give me good take off power and minimizes the low power issue in the mid range, although I can still feel it bucking a bit. First and second gear, it runs like a raped ape. 3rd and 4th it does accelerate fine, but that's when the bucking begins. I can hold my speed up and even accelerate in some cases on small inclines without shifting out of 5th gear.
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