Mechanics

CHEVROLET BLAZER ENGINE PROBLEM

1992 Chevrolet Blazer • 200,000 miles

I have a 92 Full size Chevy Blazer 5.7 Liter 4wd.
fuel pump was replaced at 190,000 miles.
The fuel pump runs for a few seconds when I turn the key to on.
The car however will not start. If I put a squirt of gas in down the throttle body
the car starts and runs. After 5 or 10 minutes Idling the car abruptly quits.
When I have someone crank the engine and I watch the throttle body injectors
they do not squirt any gas into the throttle body even though the pump goes on
for a few seconds when turning the key to on. I can squirt more gas into the throttle
body and start the car and it will run for another 5 or10 minutes and abruptly die
again. Each time the engine dies it is instant, with no grasping for fuel.
Its like someone pulled the plug. I have watched the injectors when the engine dies
and at the moment the engine dies the injector stop spaying fuel. Something is sensing a problem and shutting down the engine.
Does this sound like any of the following.
1: the ECM
2: the Throttle Position sensor
3: the Oil pressure sensor
4: the Fuel pump Relay
5: the Fuel pump
6: Distributor cap and rotor




Avatar
Guest
November 5, 2012.




Any applicable trouble codes? Did you check for voltage and ground at injectors. If computer doesn't see rpm signal, no injector pulse. The rpm signal should come from pickup coil to ignition module to ecm.

JDL
Nov 5, 2012.


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