[V8] Who Works on ECUs?

[Carol, Dave, and Zach Weiss]

Good ideas.  Alex at IA also recommended looking for intake vacuum leaks,
and said that plug wires too near the speed sensor wiring can confuse the
ECU.

 

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.

 

Only option besides fixing the ECU is getting one from another (but
automatic) car.  Anybody know the consequences of using an ECU out of an
automatic, other than the higher idle?  Can it be tweeked to get the idle
down?  Putting in the IA chip should take care of the maps.

 

Dave

 

-----Original Message-----
From: Ed Kellock [mailto:ekellock at gmail.com] 
Sent: Tuesday, January 17, 2006 12:17 PM
To: Ingo Rautenberg
Cc: Carol, Dave, and Zach Weiss; V8 List
Subject: Re: [V8] Who Works on ECUs?

 

I've also heard that the climate control vacuum box can leak.  I believe I
have that issue and have not yet pursued it.  It seems fairly clear though
since any setting (even Econ, so not a/c compensation from the ISV) aside
from OFF will cause the idle to increase. 

 

Ed

 

On 1/17/06, Ingo Rautenberg <irautenberg at comcast.net> wrote: 

Dave,

Have you thoroughly checked for vacuum leaks?  I thought I had until I found
that black plastic hard line that goes from the vacuum valve at the firewall

and loops around the inside pass side fender -- had a 1" tear along the
underside.  Also, how is your V8's performance otherwise?  Is it down from
where you remember it?  A little thirstier, maybe?  FPR more than 2 years 
old?  Replace it.  Cured my idle problem like that, though I can't say I was
getting the speed sensor code.

Don't know of anyone that works on these ECUs, but you can certainly check
with Ned.

Good luck. 

Ingo

----- Original Message -----
From: "Carol, Dave, and Zach Weiss" <cdzweiss at charter.net>
To: "V8 List" < v8 at audifans.com <mailto:v8 at audifans.com> >
Sent: Tuesday, January 17, 2006 1:33 AM
Subject: [V8] Who Works on ECUs?


Looks like the intermittent high idle problem is the computer-new idle
stabilizer and speed sensor, rung out all the wiring from the computer to 
the sensors, and it's still throwing the speed sensor code (and only that
code).  It seems the computer clamps the idle when it loses the speed sensor
input; otherwise, it should be reporting idle stabilization out of range. 
An ECU from an automatic has no codes, and the car runs normally with it
(although at a slightly higher idle than a 5-speed would).



I have Ned's chip, but IA seems to be more into turbos these days.  Is there

anybody that repairs ECUs, or should I try to get Ned himself involved?



Dave Weiss

91 5-speed

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