Continuing Problems 88 5KSQ

[Huw Powell]

Bernard Littau wrote:
> If you are a fix it yourself type, here is a great site for information on
> the 5ktq.  You may also want to pass this along to your shop.
> http://www.sjmautotechnik.com/trouble_shooting/trouble.html

The car in question is not a turbo, keep that in mind.

> Too lean usually means you do not have the typical blown air intake hose and
> metered air leak -- that would make the system too rich.  You can't easily
> get too much air into a CIS system, so if it is lean, it means not enough
> fuel.  Usually, that means the ECU is confused by a bad input.  Very rarely,
> it can be the fuel pump or fuel filter, but these sorts of problems tend to
> manifest themselves at high throttle and high boost first.

> I'll amplify on what Steve said: The mixture screw on a 5ktq never needs to
> be touched, the problem is always somewhere else :-)  You really need to
> rule out everything else before you adjust the mixture screw.  Check all the
> input sensors and switches to the ECU.

Unless it was already used to compensate for a problem that has now been 
repaired.

Make the sure the cat didn't break up and clog the exhaust.

Try unplugging the knock sensor.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/