Low control pressure and/or high system pressure????

[Huw Powell]

forgive me for "top-postng", but those symptoms sound a bit litke an 
idle switch that is not opening.  Check the two switches on the thorttle 
body... one for "wide open" and one for "idle" - are they both working 
properly?

A busted idle switch can stop higher revs...

Cody Forbes wrote:
> I was driving along after a long trip in my '86 5k-t-q KZ engine and
> as I was exiting the highway at my exit I noticed the engine didn't
> want to rev above 3000rpm. Driving to my house I experimented and
> found no way no how was the engine going over 3 grand, even clutch in
> and WOT. I didn't do much more then park it in my driveway after
> that, as I had just driven 800miles in a day. 4 weeks later I decided
> to take it to work (was carpooling). On the way in I decided it was
> the fuel filter being clogged. I replaced the filter, then dumped out
> the old one and found a ton of nasty stuff confirming my guess. When
> I went to leave work I had no change.
> 
> What it seems to be doing after further investigating is the system
> seems to run exponentially richer as load increases. If I have my
> allen wrench on the fuel plate adjustment and hold the throttle wide
> open (engine goes to 3000rpm - no more) then push down on the allen
> the engine accelerates. If I adjust it at idle to where the engine
> sounds happy my effective rev-limit is 3000rpm, but if I adjust it
> while holding 2500rpm until the engine sounds happy it goes so lean
> at idle that it wont run. A new set of plugs turned utterly BLACK
> after about 2.5 miles of driving with the adjustment as lean as I
> could get it. When I hold it WOT and look at the rear I can see
> clouds of black smoke.
> 
> Please tell me something other then "call worldpac and order a $180,
> at cost ($336 list), pressure reg"!

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/