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200 Turbo 2 WD surging and noisy fuel pump.
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.
Thanks for any input here,the car is in constant usage,and my
diagnosis needs to be fast and accurate,as has the repair,(or domestic
strife will ensue...:-) )