Loss of Power, backfiring - 1991 90 20vq sedan

[Grant Lenahan]

Good point.

On Jul 14, 2008, at 4:38 AM, mike wrote:

> I’m inclined to think that issues with exhaust, cat & fuel pump  
> would not recover once above 4k so my vote goes to ignitions system
>
>
> --- On Mon, 14/7/08, Brendan <mailinglist at endosquid.com> wrote:
>
>> From: Brendan <mailinglist at endosquid.com>
>> Subject: Loss of Power, backfiring - 1991 90 20vq sedan
>> To: quattro at audifans.com
>> Date: Monday, 14 July, 2008, 3:22 AM
>> Ok, I made it a few years without wasting bandwidth, so here
>> goes:
>>
>> --- *Only* when in gear in driving ---
>> No matter what gear (but feels different in each gear), car
>> will hit an odd
>> powerloss between 3400/3600 RPMs if accelerated slowly
>> through that band. If
>> you rocket through, there is nearly no powerloss. This
>> powerloss keeps going
>> unless you downshift and/or somehow accelerate quickly over
>> 4200 RPMs or so
>> at which point, you feel the car drop out of wimpy and back
>> into Hefty. If
>> you stay driving in what I think of as "power loss
>> mode", the car will
>> backfire eventually.
>>
>> Been happening for years, but I have adjusted my manner of
>> driving to
>> compensate, namely, I just speed all of the time.
>>
>> New parts since problem began:
>> timing belt, water pump, tensioner
>> plugs, cap, rotor, wires, air fuel filters
>> wheels, tranny/diff mounts
>> entire suspension
>> exhaust, o2 sensor, cat
>> shifter
>> MAF was gently washed with alcohol until clean, but not
>> replaced
>>
>> Ideas? My mechanic and I are nearly out of them.
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>
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