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Questions and Answers

Isuzu Trooper Short Runner

Q. I have a 1991 Isuzu Trooper with 190,000 miles. I have had extensive work over the years and until three days ago it was running great. 4 cylinder, fuel injection (throttle body is less than two years old). I went on a trip for two weeks and did not drive the car during that time. When I returned I went to start the Trooper and it would crank over, run out to about 3,000 RPM and then die.

Isuzu Trooper Short Runner

I cranked it about ten times then it ran out to about 4,500 rpms when ran fine for the rest of the day (after being parked for 5+ hours at work) The next day I got in the car and tried to start it and it did the same thing. This time it started running after about 15 times and did it again at work for about ten times.

The third day I went out and tried to start the Trooper and it would not start. Same situation as before, crank run out to 3,000, die. I finally ran the battery down and had to charge it today (Saturday). I replaced all the questionable vacuum lines and checked the computer for problems and had no indicator light show up.

That's all I know. I would like to get it running but do not want to spend a great deal of money on chasing cats. Hope you can help.


A. It sounds to me like a fuel pump control problem. When you turn the key on the fuel pump will run for 3 or 4 seconds and shut off if the computer does not get a signal that the engine is running. If it gets that signal, the fuel pump will continue to run. If not, it will shut the fuel pump off.

The thing to check here is if the fuel pump is, indeed, shutting off. The way to do that is with a test light. Hook it up to the power (black/yellow wire) of the relay and see if it shuts off after 3 or 4 seconds. If it does, run a jumper wire from the battery to that wire and start the car.

If it starts and runs check fuse 12 (10 amp) and make sure it is good. If it is, then the next thing to look at is the Oil Pressure Switch.

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