so my car ('87 turbo II) started running really wierd (sputtering and dying) and all of a sudden died and wouldn't start (would crank fine though). so i bought a new fuel pump for it because i checked all the relays and they seemed fine, but when i put it in that wasn't it. so i had it towed to a shop and they've had it for almost two weeks, now they're saying the alarm system (which i wasn't even aware that it had one) cut off the power to the fuel pump and there aren't any pulses at the fuel injectors. I looked at the stock alarm system and it said it's only supposed to cut the starter off. is this correct? does anyone know what this could be because i'm in desperate need of a car (it's been down for over a month now) and i'm tired of these people hanging on to it.
thanks.

 

Yes, the starter cut relay only cuts the power the the starter. No pulses at the injector could be one of two things:
No power is getting to the injector (less likely)

or

The ECU isn't grounding the injectors, due to a bad ground (more likely).

You will need a multimeter. At the ECU, check pins 3G and 3A with the voltmeter, you should get a reading of less than .5v with the IGNITION OFF. Anything higher points to a grounding issue. Which means you need to redo your ground which is located on the rear housing. The intake manifold must come off for you to replace this.

Next check pins 3E and 3C with the voltmeter. They should be recieving a reading of 12v with IGNITION OFF. Anything less would be an indication of a short to the injectors.

If it is a grounding problem and you do not wish to remove the intake manifold, you could do a quick fix the same way I did. The wiring harness located near the airpump has a black wire in it. Splice another wiring onto that black wire and ground it to the nearby engine bay. Works just as well as replacing the engine ground on the block but no need to remove the intake manifold.

 

thank you very much
also would a bad ground for the injectors cause the fuel pump to not power on?