85 ur-q engine woes.

[JEAN & STEVE ADAMS <adamsfam@batelco.com.bh>]

Can anybody cast some wisdom at the following?:

Symptoms: engine runs smoothly up to 4-4500rpm then starts hesitating
and won't rev higher on full throttle.Back off to part throttle and
hesitation is reduced and revs climb higher but not much power.

Action: Paul Timmerman pointed me to Ned Ritchies excellent tech tip
page at
http://www.intendedacceleration.com/html/tip2.htm
that deals with engine cut-out above 4000rpm. Checked the air temp
sensor with an ohmmeter and got correct reading. Checked the idle switch
and found a faulty reading until I put in an external earth to the
switch.

Result: Now the engine revs to 5500rpm reluctantly but power seems to
drop off dramatically over 4000rpm and there is still a trace of
hesitation.

This is all with a healthy boost reading of 13-14psi by 4000rpm using
Pauls adjustable boost control. Without the kit  I get the same
symptoms, about 10psi on the guage and a bit less power.

Should this engine really run out of puff so quickly above 4000rpm?
What should I check next?
How do I test the Fuel frequecy valve as Ned suggests?

The car has had all it's services at Audi since new, most recent about
5000km ago but I told them about the problem last time and they didn't
fix it.

Any suggestions appreciated!

Steve Adams
Bahrain.