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Post by clash69 on Jan 30, 2023 16:50:44 GMT -5
1988 stang to tc swap was done a few years ago. Chk light on Sti grounded no initiate test, At ecm sti will go to ground checked wiring and values are good from the test page no codes Ford fuel in. Com, car runs great little change I noticed at warm up there is a slight change, checked act ect values good 02 gauge I reading stich hunting at idle, if read somewhere maybe leaking cap at ecm. Figured I’d test more before condemning ecm
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Post by Stinger on Jan 31, 2023 0:32:06 GMT -5
So the only problem is the CEL is on?
Does the fuel pump prime and shut off at key on or does it run constantly key on?
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Post by clash69 on Jan 31, 2023 11:43:57 GMT -5
yes cel is on but I believe there is a code lurking, for the last month the cel would come on at cold idle for 30 to 60 sec and then out not to be seen again until the next cold start, now on all the time. fuel pump primes and then off, fp at 39lbs running
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Post by Stinger on Jan 31, 2023 11:58:52 GMT -5
Not outputting codes (just a constant tone when using a "beeping" code reader) is one of the signs of a failed ECU. Another would be the fuel pump being always on (which is why I asked).
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Post by clash69 on Jan 31, 2023 13:02:42 GMT -5
No tone from reader
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Post by Stinger on Jan 31, 2023 15:28:56 GMT -5
That would make me think there is a wiring fault for the test port in the harness.
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Post by clash69 on Jan 31, 2023 17:39:44 GMT -5
Continuity tested wire from sti test plug to computer was good white red trace pin 48
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Post by Stinger on Jan 31, 2023 23:58:13 GMT -5
Short of opening the case and doing a visual inspection, only thing you can do is swap it out and see if the problem goes away.
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Post by clash69 on Feb 1, 2023 11:32:29 GMT -5
Yup that was my thought,thanks for your time,I'll go look on ebay
any companies out there u know that repairs ecms
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Post by Stinger on Feb 1, 2023 15:46:19 GMT -5
There are a few out there but none specifically for these ECU's, or any that I'm aware of that are remotely affordable.
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Post by clash69 on Feb 7, 2023 16:27:06 GMT -5
Replaced ecu cel light out no codes,initiating reader thanks for the advice
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Post by Stinger on Feb 7, 2023 20:45:00 GMT -5
Good to hear!
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