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Old 08-31-2006, 02:31 PM   #1
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Default No spark or signal to the injectors

Ok...so im swapping a 3800 into my fiero...ive got the engine in...and trying to start it. But it seems the the ecm isnt telling the engine that it needs to spark, or fire the injectors. Ive got the cam angle and crank position sensors plugged in, those were my first thoughts. Keep in mind ive got the harness all apart, and there are loose ends. Im thinking there is a loose end that needs power... This is all on a ln3 engine from an 89 bonneville. Its hard to ask for help, becuase theres no way to show you guys what all is hooked up and what isnt. But maybe throw out some ideas? Or if someone knows what actually tells the ecm the igniton is on, and to put out spark? Ive got 12volts to both my ignition modual, and fuel injectors, and the fuel pump runs when i turn the key...ive got fuel pressure, but nothing going through the injectors. I can roll the engine over and over (although im doing it manually, not through the key)
Any help would be great!
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Old 08-31-2006, 05:08 PM   #2
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I'm assuming your using the PCM from the Bonneville. It should have power going to terminals b1 & c16. PM with an email address if you'd like a wiring diagram.
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Old 08-31-2006, 07:44 PM   #3
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Keep in mind that the ICM controls spark and fuel timing for the first few seconds after starting, then hands off control to the PCM. If the PCM fails, the ICM should take over at reduced power (limp mode). Cam and Crank sensors both pass their signals through the ICM to the PCM for this purpose. Either module can make use of their inputs.

When you get the wiring diagram, try to shoot resistance (continuity) all the way from the cam sensor harness, through the crank sensor, through the ICM, and back to the PCM. My bet is your issue will end up BEFORE or AT the ICM, and not the PCM (unless you have multiple issues).
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