[V8] Who Works on ECUs?
Steven.Buchholz at kla-tencor.com
Wed Jan 18 13:58:12 EST 2006
... the fact remains that the behavior changes simply with the ECU swap. Perhaps a case can be made for a temp related idle difference, but it is still true that each ECU is seeing the same temp sender. Personally, I can't see a connection between an OXS and idle speed.
San José, CA (USA)
> My thought as well - the ECU would not idle this high unless maybe it thought
> the engine temp was below zero F?? even then I doubt it, and you would also
> have a very rich mixture.
> Most likely you have a major air leak or the throttle linkage is binding.
> There are a few known trouble spots. I would pull the throttle body off (not
> hard to do, but there are some rubber gaskets that could break) and inspect
> thoroughly. There are lots of bearings and bushings to get sticky.
> Quoting Ingo Rautenberg <i.rautenberg at waratap.com>:
> > See, I still see a problem. You shouldn't have a steady idle of 1100 to
> > rpm (even with the auto ECU). That is too high. Have you checked the O2
> > sensor by unplugging it? I've had sheared O2 wires that threw the O2 values
> > way out of wack trying to get the engine to compensate. Bad info in --
> > info out or something like that. Last thing would be to check for jammed
> > cruise control rod, with the bushing at the edge of failure.
> > Best of luck.
> > Ingo
> > ----- Original Message -----
> > We (yes, I sought professional help) have looked for and not found a
> > leak. I think in this case the problem really is the computer, because on
> > swapping in a computer from an automatic, the idle was consistently around
> > 1100-1200 rpm with no trouble codes. With my computer, it is down around
> > 800-900 until it decides to be in the 2000-3000+ range--this typically
> > when pulling up to a stop sign. If it were a vacuum leak, I'd expect code
> > 2231 saying that the output to the ISV is out of range. The code we're
> > seeing is 2111, and the manual mentions the possibility that the Motronic
> > itself has a problem.
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