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Unexpected extra-boost from turbo?[700/1990] posted by David_M on
Monday, 12 October 1998, at 6:42 p.m.
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
Re: Unexpected extra-boost from turbo?[700/1990] posted by George Swift on
Tuesday, 13 October 1998, at 12:19 a.m.
Check to see if the actuator hose is split or broken off. That will not allow the actuator to open the wastegate, causing the overboost.
--George Swift / Volvo Car Care / 760 868 1903