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Cold Start Injector not getting electricity--Help me figure this one out--Also, where can I get a good wiring diagram? 700 1989

posted by  bobp on  Tue Jan 22 06:38 CST 2002
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Fellow Brickers,

I've posted my cold-starting problem in the past and you've all been helpful. Through a process of tests, I have discovered that the wire harness to my cold start injector is not bringing electricity to the injector. Thus, the engine does not get the extra gas it needs to start well in cold temperatures.

I tested the cold start injector wiring harness with a tester designed for that purpose (from Actron). The harness has continuity, but does not provide electricity during cold starts. In a separate test I found that the cold start injector works fine.

The car runs perfectly, once it is started. Right now, I manually squirt some gas into the intake manifold to provide the engine with the extra gas it needs for a cold start. Once the engine is warm, the engine starts without the need of the cold start injector.

My understanding is that the radio-suppressor relay must work for the cold start injector to work, and that a the temperature sensor in the engine block (B230F) must also work properly to let this harness activate.

I opened the radio suppressor relay and it looks brand new and 'appears' to function well and has clean contacts. The contacts do close when the ignition key is on.

I also tried connecting another thermal sensor to the thermal sensor wire connector(including grounding the sensor).

Any ideas?

So far, my thought is that I have a bad connection someplace, but I don't have a good wiring diagram to trace the circuits. Does anybody know where I can get a better diagram than what is in the Haynes manual?

Thanks for all your help

Bob
1989 740, 1985 250






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