[V8] Who Works on ECUs?

[Ed Kellock]

I haven't been paying attention enough throughout the life of this thread so
please forgive if this has already been asked/answered/tried, etc...

Has the ISV been unplugged during an "idle event" to see if there is any
change?

Ed


On 1/18/06, Buchholz, Steven <Steven.Buchholz at kla-tencor.com> wrote:
>
> ... 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.
>
> Steve B
> 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.
> >
> > Dave
> >
> >
> > Quoting Ingo Rautenberg <i.rautenberg at waratap.com>:
> >
> > > See, I still see a problem.  You shouldn't have a steady idle of 1100
> to
> > 1200
> > > 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  --
> > bad
> > > 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
> > vacuum
> > > 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
> > occurs
> > > 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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