ot/89 gmc pickup

flying belgian · Dec 23, 2009

When start in the morning it will instantly quit. start again and it might run till out of shed.start again and it will quit when put in gear. start again and it will run until on road . start again and it will run until first stop sign. start again and it will run fine the rest of day. What's wrong? It seams to be doing it more.

ericlb · Dec 23, 2009

fuel filter first then if that dont fix it check the pump pressure

BCnT · Dec 23, 2009

i bet its got an electric choke on it and choke is opening before engine warms up OR choke is stuck open

i forget when GM went to fuel injection so if it has that...i dunno.

Chester5731 · Dec 23, 2009

The last carb GM used on a pickup was in 1986.

lakeside · Dec 23, 2009

Just to add, I have run a couple of chevy 4.3 V6 engines into the ground(very high mileage) and both dead stopped when the fuel pump went, never had a fuel filter warning in advance before the pump failed.

rhouston · Dec 23, 2009

If it is computer controlled a weak battery will cause it to stall just like it had a huge vacuum leak.

Old Ford Mechanic · Dec 23, 2009

Throttle position sensor.

BCnT · Dec 23, 2009

thanx for the update...last 25 years working was in Ford/LM dealerships and that was 20 years ago.

MarkB_MI · Dec 23, 2009

First thing to check is the fuel pump. Take the fuel line loose at the filter and make sure it's pumping plenty of gas.

dhermesc · Dec 23, 2009

Agreed. The fuel pump is probably forcing fuel through a mostly clogged filter and shuts off to save itself. I doubt the fuel pump itself has failed, usually those pumps just quit and it doesn't start again until you replace it.

tubby · Dec 23, 2009

Check the coolant tempature sensor. It controls the rich lean setting for the T.B.I.

DJM75 · Dec 24, 2009

if it was the fuel pump or the filter it would do it all the time but since it runs great after it warms up I would say coolant sensor also. If it was a throttle position sensor likewise it would do it all the time too. You need to look at things that have to do with temp of the engine.

bradk · Dec 24, 2009

Have had a few TBI Chevs come through my way with similar if not exact symptoms.Pick-up coil inside distributor cured 'em all.

chris blohm · Dec 24, 2009

IGNITION CONTROL MODULE UNDER DIST CAP CAN BE TESTED AT MOST AUTOPART STORES
HTH

ot/89 gmc pickup

flying belgian

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ericlb

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BCnT

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Chester5731

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lakeside

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rhouston

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Old Ford Mechanic

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BCnT

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MarkB_MI

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dhermesc

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tubby

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DJM75

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bradk

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chris blohm

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