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What would cause the injectors to not fire?

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Old Sep 27, 2003 | 09:46 AM
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Lee7's Avatar
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Car: 88 BMW 535i
Engine: 3.5L M30
Transmission: 4HP22E
What would cause the injectors to not fire?

Sorry for posting this in these forums, but TGO are the most knowledgable car people i know, and i cant find any other forums that specify on this subject.

I just got a BMW K75C motorcycle yesterday for free from a freind of mine because he says he cant get the damn thing running for the life of him.

Anyways, the spark plugs work and are getting spark, so ignition is not the issue. The engine is a 3 cyl fuel injecter motor with 1 injector per cylinder and 1 throttle body per cylinder making 80hp.

I pulled the fuel rair off, along with the injectors and cranked over the motor, none of the injectors were firing so i pulled off on injector and put a voltmeter onto the wiring harness contacts, it read no signal.

So, the injectors are not getting a signal, therefor they are not firing and not allowing the engine to get gas, in turn this is probably 99% of why the engine does not run.

At first i thought the computer might me fried, but the ignition is computer controlled, and it IS getting spark, so the computer cant be fried right? I started looking at the wiring harness for any cut wires and the like, but i could find nothing.

I dont know what to do now, i dont have alot of experience in the FI and computer stuff, so that is why i ask you guys.
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