ECM trouble?
Thread Starter
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
ECM trouble?
Hey everyone, if this is the wrong section im sorry and someone move it please. I recently rebuilt my 383 in my 86. Installed everything back in the car hooked everything up. Cranked it up it for 30 secs or so then shut it off to put the rest of the accessorys etc on and fill it with water. cranked it later that night to show my dad and it back fired and died. couldnt get it to crank back. the rotor in the distributor cap came loose and got caught up on the housing and tore it up. replaced it the cap seemed fine. Got everything back together and it will crank up for a sec and shut off. I hook my scan tool up and i get code 34 code 14 and 15 i beleive. My scan tool is a OTC and it has a datastream function. With the engine switched off all of the data read outs on the otc screen were like spinning. The MAF RPM LV8 and all sorts of readings are just going up and down, without the engine even running! The TPS voltage will not move no matter the throttle position. When i crank it, it runs for like 1-2secs and just shuts off. no response at all the throttle.
Anyways, I need help with this, seems weird and I have very little knowledge of the electronics on this thing. To me it sounds like a bad ground or bad ecm. I am open to suggestions though.
Anyways, I need help with this, seems weird and I have very little knowledge of the electronics on this thing. To me it sounds like a bad ground or bad ecm. I am open to suggestions though.
Thread Starter
Instructor
Joined: Jan 2006
Posts: 160
Likes: 1
From: Fl
Instructor
Joined: Oct 2006
Posts: 213
Likes: 0
From: Mandeville Louisiana
Possible damage to ignition module
Are you sure that the ignition module didn't get dinged when the rotor came loose?
During cranking, timing is controlled by the ignition module, but once the ECM sees startup (I believe somewhere around 400 RPMs), it sends a signal to the ignition module and the module switches modes so that the ECM is controlling timing.
If the module got dinged, it could be causing this symptom.
During cranking, timing is controlled by the ignition module, but once the ECM sees startup (I believe somewhere around 400 RPMs), it sends a signal to the ignition module and the module switches modes so that the ECM is controlling timing.
If the module got dinged, it could be causing this symptom.
