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Discussion Starter · #1 ·
Got a 2000 Silverado Z71 short box regular cab dark blue with the 4.8. It has a lot of miles 215,000+ but seems to be doing good. Got a great deal on it and it and I needed a truck.

Issues,
-It shifts clunky but nothing outragous for the miles. Added some Lucas tras treatment with little results.
-The tow/overdrive off button on the shifter no longer works.
-It doesn't like to start on cold days. It turns over freely but doesn't want to start. During warm weather it starts perfectly. Battery checked out ok at autozone.

work done,
- new plugs and wires
- all fluids changed to include
- oil every 3,00 miles
- transmission flush
- both differential fluid change
- coolant flush
- Intake cleaning service at local lube shop
- I cleaned out the throttle body with cleaner and a toothbrush

Plans,
- Volant CAI
- Magnaflow dual exhast
- Predator tuner
- fix current issues


I also own a 2006 GTO. It is a fair weather toy/DD. I have a PCV catch can, Billet performance shifter, Predator tuner and some other little mods like blacking out the Pontiac emblems and Royal Purple in trans and dif.
 

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Welcome

:sign0016: A couple of things to check:
1. Coolant sensor. This is the sensor that tells the PCM the onboard computer how cold it is and in turn the computer tells the injectors adjust the air/fuel ratio. It has a 2 wire connector and is located in the intake manifold near the thermostat housing. Test it, while the enging is cold, by unplugging the connector to simulate a cold conditon and the computer will tell the system to go full rich. If it starts up, buy a coolant sensor.
2. Fuel pressure. Can be the pressure regulator or the fuel pump. You need to test the fuel pressure. If you don't have the tool for this, have your mechanic check the pressure for you.

I hope this helps, come back for more help or to share your experience.

P.S. Is it throwing any DTC codes?
 

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Discussion Starter · #3 ·
I will try the coolant sensor when it gets colder out. It starts fine when its warm just doesn't want to start when its close to or below freezing.
I don't have a fuel pressure tester but I could take it in a have it checked. I do hear the fuel pump running when I turn the ignition on.
I don't know if it's throwing any codes (don't have my handheld yet) but I assume it isn't because there is no Check Engine Light.
Thanks for the help,
 

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:sign0016: welcome to the party. hope you get that problem solved. along with what unplugged said do a search in the silverado section
 

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welcome! lets see some pics! :sign0016:
 

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welcome to the forum. If I were to have any new "muscle car" it would be the GTO. They sound mean straightpiped. :great:
 

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I love GTO's
welcome
 

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Welcome to the site!
 

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Welcome to he site. I'm prety new myself but can't get enough of it. More information than any one person can stand. Any issues I'm sure you'll find here. If not someone will point you in the right direction.
 

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Discussion Starter · #12 ·
Did you ever find out why it wouldn't start on cold days, I'm having the same problem with my 99 tahoe.
It hasn't gotten real cold yet this year but it hasn't had the problem yet. I replaced the battery with a Duralast gold (800 CCA). And I replaced all the belts with gator back (A/C Belt Sucked).
 
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