4kq acceleration issue

[Grant Lenahan]

OK, wow. Open ended issues.
You need to start with the basics. Since you dont know when the plugs, 
rotor, cap, etc were last done,
inspect them. Better yet, replace them. But that's a money issue.

Many of your problems - cold start, cold idle, dieseling all suggest 
mixture problems.
But that could be from LOTS of things.
- cold start ("5th") injector
- mixture control adjustment
- o2 sensor (i'm suspicious here ...)
- vacuum leak

It seems to me that the first thingh you need is facts. Measurements.
Too bad its pre-OBD or I;d have you go for codes.  But your next best 
thing would be emissions readout.

Grant

On Feb 13, 2007, at 2:56 AM, Rory [Armodis.List] wrote:

> Hey audifans
>
> I have a stock 85 4000 quattro that needs a lot of love =)  Based on a
> couple references from audifans, I believe the car has an Inline 5
> 2.2L 10V CIS-E.
>
> - The valve cover leaks and the lifters clack pretty bad.
> - It idles high, usually a little above 1000.
> - It has some trouble starting in the cold.  The colder it is, the
> harder it is to start.
> - I have to give it some gas to get it to idle steady but then its 
> good to go.
> - Sometimes it will almost stall until I get the car moving and then 
> it's ok.
> - The temperature gauge usually sits between the 1/2 to 3/4 mark
> unless I have the heater on and then it drops down to between 1/4 and
> 1/2.
> - The motor diesels.
>
> The fuel pump, fuel pre-filter, and fuel filter have all been replaced.
> I do not know when the plugs, wires, cap and rotor were last replaced.
>
> Last night the car suddenly started having acceleration problems in
> any gear.  I kept the RPMs above 4000 and the acceleration problem
> seemed to go away long enough for me to get on the highway and get
> home.  This morning and through the day the car seemed to function as
> it usually does.  Tonight the acceleration problem came back and
> didn't go away.  I limped it home and could smell something burning,
> but didn't get a good whiff.  I think it was plastic like.
>
> In looking at the Bently it seems this could be caused by a leak in
> the air intake system, differential pressure outside of tolerance, or
> several other things.  In searching through the archives I found
> several references to the air intake leak and one about the oxygen
> sensor.  I tried removing the oil dip stick as recommended in a post
> from the archives to test the air intake issue, but that didn't change
> anything.  Several posts are in reference to turbo motors, so I'm not
> sure how that plays into things.
>
> I know the car has quite a few issues that could cloud what is causing
> the acceleration problem, but any ideas on where to start or what is
> most likely to be the problem would be deeply appreciated.  If there
> is anything I *must* do to narrow the problem down please let me know
> (ensuring the idle screw is tightened down?).  I'm saving my pennies
> for a motor swap, so I'd be happy if I could just get it running
> fairly normal again.  Hopefully long enough to make it through
> snowboarding season =)
>
> Thanks in advance!
> Rory
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