Re: 200 Turbo 2 WD surging and noisy fuel pump.

["Shawn K." <skolu@getnet.com>]

Chris Wilson wrote:
> 
> 1987 Audi 200 Turbo 2WD. 80K miles.Fuel pump noise started about 2
> weeks ago,now very noisy.Wife complains of surging and poor
> performance at high to full throttle openings.I drove the car and it
> seems to be boost related."Gauge" shows 1.4 / 1.5 bar boost maximum.At
> high boosts the surge is apparent,and performance is sluggish.At
> cruise the car seems normal.Sometimes the surge is gone and car
> performs normally.Boost still reaches circa 1.4 bar.
> 
> Questions: Is there a known fuel pump problem with these cars?Is boost
> solely controlled by air pressure to the wastegate,or is there
> electronic control? How is overboost,(say a stuck wastegate or pipe
> off),handled? At what boost should the failsafe device operate?How
> accurate is the "gauge" considered to be?Ie should I put a remote
> proper boost gauge on for diagnosis?
> 
> A quick other problem.The dashboard water temp gauge was
> intermittent,now permanently broken..:-( Does the gauge sender control
> just the gauge,or does it have any other role?I guess this problem
> is totally unassosciated with the above.

I have an 89 200 and posted a similar problem awhile ago.  One
suggestion  which I received was to check the fuel pump.  It seems that
these models had a painted fuel tank interior which could slough off and
clog the fuel pump intake.  This did not turn out to be my problem as
mine was a vacum leak in the flex hose of the intercooler.