89 Cav 2.0 Fuel Delivery Problem

[GreasyWrench]

Background:
My girlfriend's car broke down when she was leaving work. In troubleshooting the issue in the parking lot I found that the compression in cylinder #4 was only 85 p.s.i. I figured she had blown a head gasket and had the car towed home. I had replaced other parts while troubleshooting the issue (see below) that were either issues themselves or were attempts to fix the problem.
The car still did not start after the head gasket replacement and I found that the injector was not firing, so I replaced it. The car started right away and ran perfectly, but died after running at idle for a couple of minutes. I could start the car a few more times before it would not start anymore. If I leave it for a while then I can run through the same start/die scenario for a few more times.

The real problem:
I was able to see the injector while running at idle. It produces a very fine, barely visible mist of gasoline. What is happening after a couple minutes of idling is that the injector begins firing a full stream of gas and floods the engine. I can restart the car and the same thing happens. Eventually, the injector is firing the full stream while cranking which prevents the engine from turning over.

Parts already Replaced:
Head Gasket and related gaskets, O2 Sensor, Spark Plugs, Plug Wires, Injector, Fuel Pressure Regulator

Parts Tested - OK
Throttle Position Sensor

Please help!!!

[noshun]

Originally Posted by GreasyWrench

Background:
My girlfriend's car broke down when she was leaving work. In troubleshooting the issue in the parking lot I found that the compression in cylinder #4 was only 85 p.s.i. I figured she had blown a head gasket and had the car towed home. I had replaced other parts while troubleshooting the issue (see below) that were either issues themselves or were attempts to fix the problem.
The car still did not start after the head gasket replacement and I found that the injector was not firing, so I replaced it. The car started right away and ran perfectly, but died after running at idle for a couple of minutes. I could start the car a few more times before it would not start anymore. If I leave it for a while then I can run through the same start/die scenario for a few more times.

The real problem:
I was able to see the injector while running at idle. It produces a very fine, barely visible mist of gasoline. What is happening after a couple minutes of idling is that the injector begins firing a full stream of gas and floods the engine. I can restart the car and the same thing happens. Eventually, the injector is firing the full stream while cranking which prevents the engine from turning over.

Parts already Replaced:
Head Gasket and related gaskets, O2 Sensor, Spark Plugs, Plug Wires, Injector, Fuel Pressure Regulator

Parts Tested - OK
Throttle Position Sensor

Please help!!!

It sounds like it's getting a bad signal. It may be that the MAF is faulty. Has the car been fitted with an oiled mesh Air filter such as K & N?

[GreasyWrench]

The car is completely stock. No mods whatsoever. It's simply a commuter car. I'll test the MAP sensor and post the results

[noshun]

Originally Posted by GreasyWrench

The car is completely stock. No mods whatsoever. It's simply a commuter car. I'll test the MAP sensor and post the results

map and maf are two different things MAF- mass air flow sensor. MAP - Manifold Absolute pressure sensor.

[GreasyWrench]

I forgot about this post. The issue was the ECM. I started to remove it from behind the dash and heard a click from the engine compartment. Every time I pressed on the ECM I would hear the click. The click was the injector activating. Replacing the ECM resolved the issue. The car now runs perfect!