85 4kq power hesitation when cold (FAQ)

[gottasix]

Well guys but I am dragging my feet on this one.  After a visual this
weekend, I did notice that there was some leakage around the Diff. pressure
reg., so when I get the time I need to get the multimeter out and test. The
rest of what Ben mentioned below had been replaced or checked within the
last year/ week.
Will keep you updated as to what I find.
Jeff
85 4kq

----- Original Message -----
From: "ben swann" <benswann at comcast.net>
To: <gottasix at netzero.net>
Cc: <quattro at audifans.com>; <benswann at comcast.net>
Sent: Monday, March 10, 2003 11:24 AM
Subject: 85 4kq power hesitation when cold (FAQ)


> Here we go again...one for FAQ.
>
> After performing the routine maint. - Air Filter change and clean air
> sensor plate/fuel distributor assemble and throttle body - while at it,
> a good time to check injector pattern (not necessary unless you have
> ruled out other things).
>
> Replace/check ign. cap/rotor/plugs.
>
> Check/replace all vacuum lines.
>
> Basically a general, yet thourough cleaning and going over things.  OK -
>
> Now that we have gotten all that out of the way, you can get to the
> things that drive you crazy:
>
> O2 sensor - can cause this problem.  I recently disconnected one and
> the problem went away, allowing me to adjust so car could be driven
> until replacement.  O2 sensor was throwing the mixture off.
>
> My bet would be on: Fuel Injectioon Thermo-sensor located on bottom of
> cooling neck.  This has been culprit on every one of these cars I have
> seen - at least 5 in the last year at Ben's DIY home of neglected AUDIs.
> You can test to see if good, or just buy one from
> Rod at thepartsconnection.com and cut to the chase.  They have MTBF of
> about 130 kmi in my guestimation.
>
> Differential pressure regulator - if dirty/clogged can cause this
> problem, or worse.  Can be removed an cleaned.  If this is a problem,
> there may be things in the system before it that are dirty/gummed
> up...like
>
> ..I've also seen a number of bad fuel pumps too - nasty job, but if
> your fuel is questionable or history of the car, may want to at least
> disconnect the line from pre-filter and see if it is loaded up or not.
> Be careful with GAS!
>
> Other stuff - probably, but there is a bunch of stuff I mention above
> that should be ruled out first.
>
> Happy Hunting.
>
> Ben
>
> [Hello listers,
> Unable to locate an answer to this common 4kq problem in the archive so
> I look to you for assistance. I have an 85 4kq with 110K, my issue is
> when the engine is cold; idles and starts fine, but when I attempt to
> take off and drive there is very little power, allot of hesitation,
> especially going up hills, but after 5 minutes or so, temp gauge needle
> gets to 4 o'clock, the car jumps to full throttle and has good power
> after that, like a sticky breather valve not allowing it to breathe. I
> can not see or hear any potential vacuum leaks, just changed the temp
> sensor to the ecu (a problem you listers helped me with), plugs, wires,
> cap rotor, fuel pump/filter, air filter are clean/new.  I have been
> dealing with this for the last 5 months (just let the car warm up..),
> but I guess I am becoming impatient now and want to try to resolve the
> problem.  Thank you in advance for your thoughts..
> Jeff
> 85 4kq 110K
> 85 4kq 95K clean parts car]
>
>
>
>