4kq acceleration issue

[Tony Hoffman]

I'd start with the intake air boot. Make sure it isn't torn, and is
connected on the ends. Also, look at the bottom, where the fitting comes
out. It's right in front of the battery. When checking the boot, pull it a
bit and make sure there are no crackes on the pleats of rubber. They usually
hide a bit till you step on it. The torque of the engine seperates them
then. One thing I do whenever getting an older car such as this is replace
all of the vacuum lines. It costs about $10, and saves a lot of little
headaches in the future.

Tony Hoffman


On 2/13/07, Rory [Armodis.List] <armodis.list at gmail.com> 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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