engine wont start when warmed

[bradley22]

i have a 1994 gmc sierra. 5.7L. when i first start my truck when the motor is completly cooled it runs perfect, but after i drive it for a little while and the motor gets warm to max temperature when i turn the truck off it wont start back.. it will turn over.. all it does is flood really bad and wont stay running.. please help

[2000CAYukon]

Leaking FPR diaphram or ECT sensor. With the engine hot, what is the resistance of the ECT sensor?

EDIT: I doubt this could be a leaking FPR because on TBI models, the fuel pressure drops to zero when the key is off.

//2000CAYukon

[bradley22]

Originally Posted by 2000CAYukon

Leaking FPR diaphram or ECT sensor. With the engine hot, what is the resistance of the ECT sensor?

EDIT: I doubt this could be a leaking FPR because on TBI models, the fuel pressure drops to zero when the key is off.

//2000CAYukon

not sure dnt have a volt meter

[2000CAYukon]

Originally Posted by bradley22

not sure dnt have a volt meter

You can bypass the ECT by removing the connector (next to Tstat in intake manifold) and create a jumper wire between the 2 wires in the connector. If it starts good warm with the jumper wire, the ECT is bad.

Your other option is to use a scan tool and see what temp is being reported by the ECT.

//2000CAYukon

[bradley22]

ok i did what you said by jumping it.. still no luck did the same thing. i know the vaccuum is correct, its not the computer, its not the sensor on the side of the throttle body, i have no idea

[ctwright]

Maybe ignition coil, ignition module, have you checked into these?

[bradley22]

i have replaced the module underneath the distributor

[ctwright]

Originally Posted by bradley22

i have replaced the module underneath the distributor

I would replace the coil then, that is a common problem of a vehicle that the same symptoms as yours, not starting after warm.

[bradley22]

ok, is that the coil that is connected to the distributor?? i believe it has 2 wires attached to 1 clip

[ctwright]

Originally Posted by bradley22

ok, is that the coil that is connected to the distributor?? i believe it has 2 wires attached to 1 clip

I'd have to see a picture to see what you are talking about, but if you are talking about the thing connected to your center plug wire on the distributor, yes.

[bradley22]

yea thats it, thanks i will try asap

[ctwright]

Here is a page with ignition coils for your truck, they are in the $50 to $60 price range at advance auto parts. http://shop.advanceautoparts.com/web...tion%20coil___