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Hard Start when Warm

Dan_RL72

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Dan_RL72 Enthusiast

Dan_RL72

Posted
Posted

HI all,

This one has me stumped. I ran a search without luck. It takes 2 or 3 tries to get the truck to start when its warm. Cranks and cranks and then finaly catches and runs bad for a minute or two, then its fine. Cold start has no issues. I changed the plugs and check Fuel pressure. Anyone had this problem? BTW I have a 2000 1500 with the 5.3.

silverado man Senior Enthusiast

silverado man

Posted
Posted

Most likely it is going to be your fuel pressure regulator. If you take the hose off at the regulator and gas pours out your regulator is bad. I had the same problem a couple months ago and after the fix I haven't had a problem since.

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bikeyron New Member

bikeyron

Posted
Posted

I had a GMC Safari that did the same thing. It was a little electric black box that cost about $15. I am having the same issue with my GMC Sierra. I don't remember the electronic part. It cost me $50 to have it anaylized in "95". I'm sure it would be more than that now. If you get an answer let me know.

X-man Enthusiast

X-man

Posted
Posted
HI all,

This one has me stumped. I ran a search without luck. It takes 2 or 3 tries to get the truck to start when its warm. Cranks and cranks and then finaly catches and runs bad for a minute or two, then its fine. Cold start has no issues. I changed the plugs and check Fuel pressure. Anyone had this problem? BTW I have a 2000 1500 with the 5.3.

 

I had a similar problem with my wife's Explorer. It was an injector leaking down. The leaky injector effectively flooded the engine which made for a difficult hot restart. But there was no problem when the engine was cold as the fuel presumably had evaporated out of the manifold by then.

You could try doing a pressure leak down check to see if it is within spec but you may have to plug the FPR return to isolate that as a leakdown source.

Good luck.

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