1990 Chevy Truck 1990 Chevrolet C1500 -- Engine Stalling!

Tiny
VIXEN20
  • 1990 CHEVROLET TRUCK

Engine Performance problem
1990 Chevy Truck V8 Two Wheel Drive Automatic 89000 miles

1990 Chevrolet C1500 -- 350 V8 TBI -- Regular Cab, Short Bed, 2 wheel drive, 89000 miles.

Everything on truck is 19 years old, except:

New parts: EGR valve, coolant temperature sensor, fuel filter, idle air control valve, pcv valve, air filter, 1 oxygen sensor (in the exhaust manifold), spark plugs, distributor cap and rotor.

Hello there,

My truck's compression is good and I do get spark.

I have driven it once where the check engine light stayed on while driving at speeds of 60 mph on highway. Turned off the engine and turned the engine back on. The check engine light did not come back on. I hooked up the Actron CP9001 code scanner.I received: Flash (pause) Flash Flash. That means I got a code 12. Six times. This means system is normal.

On cold starts, most of the time, engine starts right up. My engine runs strong while accelerating and driving. When it gets to operating temperature and I stop at a stop sign, truck shuts right off with all the dash lights still on. (The check gauges, check engine, and battery lights are still on.) I try to start the engine, the engine cranks over strong, but engine does not start.

I let the truck sit until engine is cool and I try to restart it. Sometimes it restarts, sometimes it just cranks over.

I checked around throttle body, pushed the throttle, and no fuel was coming out. Bone dry. However, if I let the truck sit and I jump start the truck, the truck cranks over strong for a little bit, but has always started right up. It will only drive so far and after I stop the truck a few times at a few stop signs -- it will stall again at idle.

Fuel pump comes on. (I hear the whirring sound when key is in the "ON" position.)

Is the fuel pump weak at idle? Or could it be the ECM/PCM? Or both?

Thank you!

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Wednesday, August 5th, 2009 AT 8:55 PM

2 Replies

Tiny
VIXEN20
  • MEMBER

Update:

I replaced the fuel pump. The truck still does not start.

Now, I get no spark or fuel.

It seems that something is getting very hot and burning out. Now, it has completely burned out because I can't even start the truck whether I let the engine cool down or not.

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Friday, August 7th, 2009 AT 2:33 PM
Tiny
JAMELROSE
  • MEMBER

Did you ever get this fixed? I'm having the same problem on my 1990 with 150k on it. It starts up fine and has many new sensors and a new distributer cap and rotor and new coil. I get about a half mile from home and it stalls at a stop sign and won't restart. Later once cool it will start right up. I've replaced both temperature sensors and they don't appear to be giving me an accurate temperature reading on the dash but would that cause this problem? If I put it in neutral at a stop sign and rev the engine it will stay running. I don't want to keep doing this. Please any info would be helpful.

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Wednesday, December 7th, 2016 AT 7:24 AM

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