5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

ecm ground problems

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Old Sep 23, 2010 | 04:41 PM
  #1  
8850stang's Avatar
8850stang
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From: alabama
Default ecm ground problems

well my fox went stupid on me and started flooding horribly for no reason. found a fuse shot and replaced it but it didnt make a diff. one of my honda friends had a wiring problems and his was flooding like this and he found a ground wire broke in two. so i got to checking some stuff and thinking and put a ground from the battery ground to the ground prong on the eec test thing under the hood and it started running normal. i was wondering if there is a fusable link somewhere or a ground on the ecm that i cound jump to the frame or something to fix it?
Old Sep 23, 2010 | 07:17 PM
  #2  
Bubba 95SN's Avatar
Bubba 95SN
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At the negative battery connection is two smaller wires that go to radiator support. One of these wires is the ground for the computer. Check for continuity from pin 40&60 at computer to wire at negative battery. No continuity...fix open circuit. Have seen a ground run to test connector as you stated to make a bad computer still function. One time. When I disconnected it would not operate. The computer was defective. Might check ground to O2 sensors. First run the EEC1V test. Then post results.
Old Sep 25, 2010 | 10:30 AM
  #3  
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8850stang
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thanks man. i will try to check the wires today but i cant run a eec test. i have tried using a test light and the check engine light but it doesnt work either way. but i tried to do that before it started all this so i didnt think the ecm was bad. it might be defective. it would run when it was flooding but i had to idle it up just so i could drive it back home. and my car doesnt have o2 sensors. whoever put the exhaust on before me didnt put them on
Old Sep 25, 2010 | 08:19 PM
  #4  
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Bubba 95SN
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You desperately need the 02 sensors to control fuel. This is reason for running pig rich.
Old Sep 27, 2010 | 03:31 PM
  #5  
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8850stang
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well it hasnt had o2 sensors for a year now yet it run suprisingly good. but i found a un insulated wire at the ecm and used a ohm meter to check it and it had no ground at all when i undone the jumper wire i put on. so i just put a self tapping screw in the body and put the wire around it. still working till i can do the motor swap
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