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Unexpected extra-boost from turbo? 700 1990

posted by  someone claiming to be David_M on  Mon Oct 12 12:42 CST 1998 [RELATED]

Car history.

1990 780 Turbo

85K miles

Bought it at 83K

new turbo at 80K

new timing belt at 84K

oil change at 84K

Washed it this morning

Today I experienced something strange, the turbo seemed to be overboosting. I was on the freeway and accelerated to pass another car, it felt as though I had gained 50 more HP. I looked at the boost gauge and the needle was past the end of the boost indicator. Worried I would toast something or send parts flying, I kept off the accelerator for the most part. It definetly felt and acted like the turbo was working overtime. The car was parked for about two hours, and did not misbehave again. I have no idea what my boost pressure is running, but my last gas mileage check was at about 21mpg(mixed hwy/city driving). Anyone have any suggestions on what to expect next, where to look, what to do?

Checked the archives, could not find a similar problem.

Thanks to all,

David_M





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