Re: Ahab Needs Help

["Brandon H. Hull" <brandon@cardinalventures.com>]

Lawson, Dave wrote:

> >
> I'm hoping for a little more direction before the Great
> White Whale goes to my mechanic this week..
>         Symptom: When car(91 200q) nears full boost, power
> suddenly drops off substantially and the motor runs quite
> roughly. Boost also drops. If I back off on the gas, all is
> well again.
>         Plugs have been replaced, IC to TB hose replaced, bypass
> valve is recent, hoses have been inspected closely (yup, I
> know I still need to pressure test).
>         Suggestions include: frequency valve, plug wires,
> cap/rotor, static timing, pull fault codes.
>         If anyone has any more helpful ideas, I'm all ears.
> Thanks to those who have contributed thus far.
> >
>
> Sounds like a bad mass airflow sensor. Had direct experience
> with a friends car, and have heard of a few others with this
> problem. Low boost /easy throttle the car works fine, heavy
> boost/full throttle, higher revs, car runs rough.
>
> HTH
> -
> Dave Lawson

Check out Ned Ritchie's new web site, where there is a two part "tech
tips" section on engine fall-off above 4000 rpm.  I visited the other
day and the symptoms he describes match yours...
http://www.intendedacceleration.com/

Brandon Hull
'91 CQ