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Missing injector pulses - How to narrow down the problem? 700 1990

uid 49372's pic
posted by  740_dan on  Thu Jun 12 12:29 CST 2014
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last visit: Thu Aug 28 13:10 CST 2014
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I've never tracked down this kind of problem, but I have read the ignition part of the green book. Do you have that one? It explains the theory behind the EZK and all the sensors (maybe that's what you and lucid are referring to).

I've got the greenbooks for 740s on DVD (adequate but wish I had paper version).
Anyway, there is a page showing what circuits are activated when the key is position I, II, and III, its one of the general wiring books. This could be useful to see what circuits are hot during ignition.

If my memory is good, the Injector circuit is out of ECU, So maybe track backwards:
All the injectors fire at once but there could be a problem with that circuit going from injectors to ECU. Then check circuits from ECU to ICU that control injectors.

In the back of my mind, I wonder if it could be an ignition problem, not an injector problem, because I think the computer calculates ignition before fuel. Fuel is just constant pressure and on-off signals to injectors, about as simple as it gets.


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