Question about GMC Yukon

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I have a 2005 yukon with a 4800 vortec engine, it starts fine when the engine is cold but after it has warmed up and sits for 10 minutes or so it starts hard taking 3 to 5 five seconds to start while turning over.

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These vehicles are known to have problems with the injectors and the fuel pressure regulators. leaking fuel into combustion chambers.most notable after situation your describing

Posted on Dec 06, 2008

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I have a 1998 chevy 1500 with a 4.3 liter engine,after it sits overnight it takes a while to start. After it is warm it starts fine and runs good,it happens after its cooled down


I would start by checking fuel pressure via the schrader valve on the fuel line (near the rear of the intake manifold). The vortec engines needed considerably higher fuel pressure than most to start cold, and it is quite common for a weak fuel pump to cause a cold only no start condition with that engine. You should see around 50-60 psi with the key on / engine off for about 3 seconds. Also, if the pressure drops very quickly after a few seconds, the fuel pressure regulator could be to blame.

Oct 30, 2014 | Cars & Trucks

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No heat just cold air


Is the gauge showing the engine is warming up to normal temp ?
Are the heater hoses getting hot ?
If the heater core is getting hot, it could be a blend door problem. The blend doors direct air thru the heater core and the ac evaporator among other things.

Dec 06, 2012 | 2005 GMC Yukon

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96 honda civic engine ,starts & runs fine cold-but dies when warmed up


Did you find a fix?
Same problem, wondering how you fixed it?

Mar 07, 2012 | Cars & Trucks

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I have a 97 s10 and starts and runs fine when cold but after it warms up i have to hold the gas peddle down to the mat before it will start again and when it does start it revs up to 1 1/2 to 3000 rpms and...


The repair for this is to scan the computer and see what codes are present if their are no codes indicating the TPS switch the problem will be your fuel pressure regulator.This is a fairly big job it requires removing the intake manifold if this is the 4.3L vortec engine.But Iam not sure which engine you have so this applies only to the Vortec Engine.

Apr 29, 2011 | 1997 Chevrolet S-10 Pickup

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After my S-10 sits about 30 minutes it sometimes


are you saying it starts fine cold but when hot or warm it has trouble starting, give more descriptions of conditions... weather related issues... any check engine light ?, stored codes ? any recent repairs ? give all you can..

Jul 29, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

2005 Yukon Denalli - Blow cold air out the drivers side


the passenger side electronic controller is sensing the passenger side temperature is cooler than it really is, which causes the controller to increase the hot water flow to warm up the passenger area...any time you replace a battery or loose your charge, the HVAC module will need to be reset...Try this...
Remove your hvac fuse for 10 sec - reinstall fuse. Start engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" Recalibration of module will accure when power is lost (fuse pulled, battery changed or died) If hvac reset did not work you have a trouble code - reset BCM There are two ways to reset your body control module Go to the GENERAL Remove BOTH battery cables (for the sake of CAUTION remove air bag fuse and wait 5 MINUTES) Hold both cables together for 1 minute - drains KAM (keep alive memory). Put everything back together Start the engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" If you have no broken parts - system not default (normal operation)

If that works it just saved you 600 dollars...dealer costs to repair.

Good Luck...please rate me a fixya.

Jul 25, 2009 | 2004 GMC Sierra

2 Answers

4.3 L Vortec problem, can anybody point me in the right direction


check the temperature sensor for the computer. it may be telling the computer that the engine is still cold and causing the engine to run too rich at warmer temps

Jan 16, 2009 | 1994 GMC Jimmy

2 Answers

1990 dodge colt,does not want to start in the cold


If it starts with a shot of WD-40 then fuel delivery is obviously a problem when cold. If intake air temperature sensor ( for one) is telling it that its still real warm out, then it won't give it enough fuel to start on a cold day, which requires more fuel.

Dec 19, 2008 | 2005 Ford F-150

2 Answers

2004 GMC Yukon Denali


My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.

Oct 02, 2008 | 2005 GMC Yukon Denali

1 Answer

97 saturn sc2


I had the same problem with a 97 sc2. The fix for my car was the temp sensor that controls the extra fuel when engine is cold it didn't sense that the engine was warmed up and added extra fuel flooding the engine.

Jul 22, 2008 | 1993 Saturn SC2

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