Loss of Power, backfiring - 1991 90 20vq sedan

[mike]

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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> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> ---
> Watch this space for ads :)


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