engine wont start when warmed
bradley22
03-23-2009, 05:45 PM
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
03-23-2009, 05:59 PM
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
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
03-23-2009, 06:39 PM
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
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
03-23-2009, 08:51 PM
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
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
03-24-2009, 06:26 PM
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
03-24-2009, 06:31 PM
Maybe ignition coil, ignition module, have you checked into these?
bradley22
03-24-2009, 06:35 PM
i have replaced the module underneath the distributor
ctwright
03-24-2009, 06:42 PM
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.
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
03-24-2009, 06:43 PM
ok, is that the coil that is connected to the distributor?? i believe it has 2 wires attached to 1 clip
ctwright
03-24-2009, 06:51 PM
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.
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
03-24-2009, 06:57 PM
yea thats it, thanks i will try asap
ctwright
03-24-2009, 07:09 PM
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/webapp/wcs/stores/servlet/partlist_Ignition-Coil_190_R|GRPTUNEAMS__ignition%20coil___
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