'91 90 check engine light comes on over 65mph

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Jan 21, 2004 | 08:10 PM

Audirod

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'91 90 check engine light comes on over 65mph

Any one have an idea why after we got our daughter's 1991 Audi 90 back from a
repair shop that the check engine light comes on and stays on when the car is
driven over 65 mph? Otherwise car runs fine.
Thanks.
Rod Michaelson
Walnut Creek, CA
'03 A4 avant quattro sport
'95 90 quattro sport
'91 90 cs

Jan 22, 2004 | 08:32 AM

Steve Sears

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Re: '91 90 check engine light comes on over 65mph

Rod,
Is there any way to pull the codes and find out what is tripping the check -
engine over-rev, knocking, temperature sensor, etc.?
What was done at the repair shop - look in the area of the work for
loose/broken/unconnected sensor wires.
Cheers!
Steve Sears
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
(SPAM Blocker NOTE: Remove SHOES to reply)

"Audirod" <audirod@aol.com> wrote in message
news:20040121211023.13560.00000329@mb-m24.aol.com...
> Any one have an idea why after we got our daughter's 1991 Audi 90 back
from a
> repair shop that the check engine light comes on and stays on when the car
is
> driven over 65 mph? Otherwise car runs fine.
> Thanks.
> Rod Michaelson
> Walnut Creek, CA
> '03 A4 avant quattro sport
> '95 90 quattro sport
> '91 90 cs
>

Jan 23, 2004 | 05:18 AM

NA713

Guest

Posts: n/a

Re: '91 90 check engine light comes on over 65mph

I have a 93 Audi 90 and you can dump the codes using an odd but effective
procedure. I found it out at 12v.org, but that site isn't up any more. It
involves shorting the computer terminals in the fuse box and watching the
check engine light flash.

The most common CE code is 2411, EGR valve. It comes on if the car warms up
but the EGR bypass hasn't. Mine comes on on really cold days.

I'll keep an eye out for the procedure.

Steve

1993 Audi 90

"Audirod" <audirod@aol.com> wrote in message
news:20040121211023.13560.00000329@mb-m24.aol.com...
> Any one have an idea why after we got our daughter's 1991 Audi 90 back
from a
> repair shop that the check engine light comes on and stays on when the car
is
> driven over 65 mph? Otherwise car runs fine.
> Thanks.
> Rod Michaelson
> Walnut Creek, CA
> '03 A4 avant quattro sport
> '95 90 quattro sport
> '91 90 cs
>