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Discussion in 'Gas Engines/Drives/Transmissions/Props' started by struss3, May 20, 2020.
Oops, now that I look closer I see it! Thanks for all your help. Back to trouble shooting.
Replaced sensor, nothing. Where do I find ckt numbers? It’s telling me to check ckt 439.
Chk 439 is
Thanks wanderer, I’ll check that tomorrow. Got a feeling it’s going to end up being the ECM.
Did the ignition system check and everything checked out ok. Just noticed I’m getting no fuel from injectors and no spark when trying to start. Tach only moves to less then 200 when cranking
I am pretty sure that a failed icm will result in no spark and also inhibits fuel pressure.
Out of curiosity, do you get aoil pressure indication when cranking?
No oil pressure either. I don’t have an ICM because it’s EFI, only the ECM
Bad oil pressure sensor?
If there is a distributor I am reasonably sure there is an icm under the rotor. At least every 2000 5.7 TBI (throttle body injection) I have seen has a distributor and ICM....ICM being an ignition control module.
Yes, there’s an ignition sensor under there, replaced it with 2 new ones. Thought you were talking about the ICM that the non EFI have. Sorry
I was a little faulty in my terminology... correct name is “ignition sensor assembly “. So the oil pressure sensor would be next maybe.. Anybody have something to add?
Thanks again wanderer, I will check the oil sensor tomorrow.
Tested the oil pressure sensor, getting a steady 240 ohms which supposedly means its good
One more quick check that occurred to me...
The engine harness has a cannon plug about a 1 1/4 inches in diameter with about 10 pins located on the top back side of the block. Loosen the hose clamp on it and verify the connection is tight. I had a problem similar to yours a few years ago and found that to be the problem.
Yep, already did that. Going to order a new ECM tomorrow. I’ll update after I receive it. Thanks for all the input.
Well, good and bad news. ECM is fine, saved $1800. Bad news- have no ?”$@&@ idea what the issue could be now.
Many problems like you are going through are due to faulty electrical grounding. Go through all of the engine systems ground connections.... Key switch - when you turn the key switch to the "Ign" position and "Start" position does the ECM get BAT+ power?
Thanks ttmott, I’ll recheck all my grounds again when I get home. I’m assuming I get power when I turn the key to Ign because all my diagnostic steps were good. Not sure about the start position though. I did replace it though thinking I might have a bad switch, but it still wouldn’t start.