2000 GMC truck won't start in the morning

beubank · 01-11-2009, 10:05 AM

I have a 2000 GMC truck w/ 130,000 miles. It will not start in the mornings unless I spray a little starting fuild in it. Then it fires right up. I then can start it anytime after that. I then let it sit overnight and it does the same thing.

I changed plugs, fuel filter. It sounds like the fuel pump kicks on each time I turn on the key. I don't have a code reader.

Any help would be great.

leolkfrm · 01-11-2009, 10:11 AM

Welcome to the forum
I think if you scan it, and look at the reading for the ecm temp sensor you will find it weak

mudseeker · 01-11-2009, 10:33 AM

if you do scan it, do it with a cold engine and compare the IAT sensor with the ECT sensor. they should be within a few degrees of each other with a cold engine.

stumpuller454 · 01-11-2009, 08:49 PM

Alsio could try turning key on for 2-3 seconds before crank to confirm if fuel is loosing prime overnight. If starts after wait could be check vavle prob.

beubank · 01-31-2009, 10:08 PM

So I have changed both the IAT and ECM sensors and it still doesn't want to start very well. Where is the check valve?

I am thinking I may need a new fuel pump.

01-11-2009, 10:05 AM	#1
beubank Junior Member Join Date: Jan 2009 Posts: 5	2000 GMC truck won't start in the morning I have a 2000 GMC truck w/ 130,000 miles. It will not start in the mornings unless I spray a little starting fuild in it. Then it fires right up. I then can start it anytime after that. I then let it sit overnight and it does the same thing. I changed plugs, fuel filter. It sounds like the fuel pump kicks on each time I turn on the key. I don't have a code reader. Any help would be great.

01-11-2009, 10:11 AM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,927	Welcome to the forum I think if you scan it, and look at the reading for the ecm temp sensor you will find it weak __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

01-11-2009, 08:49 PM	#4
stumpuller454 Senior Member Join Date: Dec 2007 Location: Grande Prairie, AB Posts: 2,206	Alsio could try turning key on for 2-3 seconds before crank to confirm if fuel is loosing prime overnight. If starts after wait could be check vavle prob. __________________ SUPERCHARGED 454 K2500 GMC! Watch My Youtube Videos!!<<<

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01-11-2009, 10:33 AM	#3
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	if you do scan it, do it with a cold engine and compare the IAT sensor with the ECT sensor. they should be within a few degrees of each other with a cold engine.

01-31-2009, 10:08 PM	#5
beubank Junior Member Join Date: Jan 2009 Posts: 5	So I have changed both the IAT and ECM sensors and it still doesn't want to start very well. Where is the check valve? I am thinking I may need a new fuel pump.