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2001 Silverado won't start when cold outside


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jwoolf
New User

Jan 4, 2018, 7:43 AM

Post #1 of 6 (208 views)
2001 Silverado won't start when cold outside Sign In

I have what seems to be a unique problem. When the outside temp drops to around freezing, my truck won,t start. Cranks over but acts like no fuel. Then runs fine when the temps go back up.
2001 Chevy Silverado
v8
120,000 miles


nightmaim
User

Jan 4, 2018, 7:58 AM

Post #2 of 6 (199 views)
Re: 2001 Silverado won't start when cold outside Sign In

Once you manage to start, while the engine is still cold, is there any other symptoms?


jwoolf
New User

Jan 4, 2018, 8:14 AM

Post #3 of 6 (197 views)
Re: 2001 Silverado won't start when cold outside Sign In

No there doesn't seem to be any thing else.
2 mechanics have looked at it. nothing shows on diagnostics. replaced fuel filter. air filter.


nightmaim
User

Jan 4, 2018, 8:33 AM

Post #4 of 6 (193 views)
Re: 2001 Silverado won't start when cold outside Sign In

Try to unplug the IAT sensor from the intake hose, it is usually located after the air filter and before the throttle body. Then try to crank the engine.

Sometimes this sensor can go bad and even when there is no check engine light. With the sensor off, ECU should assume safe values which can be easier to start the engine.

Ensure that you are using the right engine oil, but unless you are missing too far, for example, engine requires 5W30 and you are using 15W40, I don't think that would be enough to stop a V8 from cranking in the extreme cold.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 4, 2018, 9:37 AM

Post #5 of 6 (181 views)
Re: 2001 Silverado won't start when cold outside Sign In

No, don't go unplugging any sensors. That's just bad advice. If you do that it will tell the computer it is -40 degrees.
If you want to check your temp sensors, just look at data in the scan tool when it's dead cold and the 2 sensors should match each other.

You need to test your fuel pressure with an accurate fuel pressure gauge. This engine is very pressure sensitive and that is the symptom when it gets even a little low. The spec for the 4.8 and 5.3 is 55-62PSI and not a pound less.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jan 4, 2018, 9:39 AM)


jwoolf
New User

Jan 4, 2018, 10:11 AM

Post #6 of 6 (174 views)
Re: 2001 Silverado won't start when cold outside Sign In

thank you . will check that out






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