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Strange noise from engine... 900 1993

posted by  rjk on  Mon Jun 20 07:02 CST 2005
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last visit: Sat Dec 12 12:30 CST 2009
[RELATED]

Not sure of your noise, maybe more detail on describing it. Is it apparent only when the vehicle is stopped? Moving? Both? Pitch (high whine/low thrumb)?

Exh manifold gasket leaks can definitely affect performance, believe it or not, ambient air will be sucked in through the leak and the resulting increase in O2 content will throw off the O2 sensor reading making the computer think there is a lean mixture. It isn't a hard repair, just time-consuming, parts are cheap, just soak the manifold nuts & turbo/exhaust downpipe bolts in PB Blaster or some such penetrant so they come off easily w/o breaking the studs.

There is a section on Exh. man. gskt replacement in the FAQ's

http://www.brickboard.com/FAQ/700-900/EngineTurbo.htm#ExhaustManifoldGasketandStuds


'94 945T (daughter co-opted it for college, used to be mine)
'99 S80 (mom-in-law's)
'88 240DL (son's)
'84 242Ti (future commuter)
'89 560SL (wifemobile)
'88 300TE (my commuter, for sale)
'68 GT500KR (under restoration)
--
Bob K






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