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S3 constant speed hesitation - Help appreciated

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Old 10-06-2001, 06:32 AM
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Default S3 constant speed hesitation - Help appreciated

I´ve read lots of postings with regard to diverter valve problems which affects the turbo pressure somehow (I´m no expert).

For the past 3,000 miles, I´ve been experiencing a constant hesitation by the car when driving at a constant speed between 3000 and 4000 rpm. If feels like if the Turbo turns on and then turns off, turns on and then turn off, back and back again. Like continuous pulses of acceleration.

Is this due to a faulty D/V? Has someone experienced this before?
Any help would greatly be appreciated.

AndrewR
Old 10-06-2001, 01:25 PM
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WJM
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Default that sounds like the bypass (D/V) valve is opening

Check the hose that goes from the intake manifold to the valve it may be cracked and leaking the boost.
Old 10-07-2001, 03:09 AM
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Default Re: that sounds like the bypass (D/V) valve is opening

Thanks for the input. I´ll check if the hose is cracked somewhere.
I also heard that there should be a vacuum between the hose and the dump valve right? If not, that means there´s air leakage and thus the valve not working properly, is that correct?

AndrewR
Old 10-07-2001, 02:20 PM
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Default it goes from vac to boost... when the turbo produces boost some of the air pressure is used to ...

hold the valve shut
Old 10-07-2001, 10:36 PM
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Default Re: it goes from vac to boost... when the turbo produces boost some of the air pressure is used to

Again, thanks for the input and help.
I´ll check it myself to see if I´m able to locate the problem, and then take the car to the shop and hopefully fix the problem.

AndrewR
Old 10-11-2001, 10:37 AM
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Default waste gate malfunction

BPV problems are more likely under acceleration than steady state. Sounds like you have a waste gate problem.
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