A few days ago I was getting a CEL after idling for about 20 secs. It would come on and stay on for a few restarts afterwards. I decided to put in the 173 ECU I have. It fixed the CEL, it no longer comes on. However, I now get an anti-lock brake light on the dash. Any ideas? This is in an 88ix.
-
-
The DME has nothing to do with the ABS, that fault is a coincidental failure.
While the original DME could have been faulty, the CEL while idling is more likely to be a Lambda fault and caused by an aged O2 sensor and intake leaks. The useful life of an O2 sensor is 100k and it is a scheduled maintainance item. A smoke test is the only sure way to locate intake leaks at any of the possible locations.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL -
I am SO TIRED of seeing a smoke test suggested.Comment
-
jlevie is right tho. These cars are so old and crusty you can't rule out intake leaks.Ma che cazzo state dicendo? :|Comment
-
Use carb spray like the old days. Smoke testing is for late model 2000-up models.Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.
garage queen 91 bmw 325is / 1972 Chevy El Camino 355 sbc 450hpComment
-
-
actually, the ABS issue does have to do with the ECU (it's an ix thing).
you need to add a 1k resistor from pin 17 of the C101 connector, to ground.Comment
-
Ok, thanks, I am going to say that since I don't get a CEL anymore, it was my Ecu that was bad. It went away. Thanks Nando.Comment
-
it could come back. it was in an old TSB on early ix's - what happens is the output from the ABS computer to the ECU can end up floating. Grounding it with a resistor still lets it work but you won't get the ABS fault anymore.Comment
-
If it does, then I will look into it, but for now it is gone. I think my tps may be going bad, because it only does it on idle. Thanks for the info.Comment
-
Wouldnt the carb spray NOT work because your ICV is constantly modulating idle air? Ive never had the carb cleaner trick work on a car with a ICV.Ma che cazzo state dicendo? :|Comment
-
I don't know if the ICV is the reason, but i've never had the carb cleaner trick work on an M20 either.Comment
-
It works after the icv. I think it may be the reason.Comment
-
I had the opposite problem. I took out my 153 and installed a 173 w/ Bavauto chip. CEL went on after about 200 miles, and my mpg's dropped a few numbers. Put the 153 back in and car ran fine w/o any warning lights.'87 325i "Chewey" (RIP, my beloved)
current:
'01 e46 325iT "Dot" - #datwagonlife
'87 e30 325i "Tui" - she has her mother's eyesComment
-
Weird, I think my ecu was the problem, but time will tell.Comment
Comment