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Poor mileage S90-V90 1998

posted by  DanR on  Wed Nov 28 14:21 CST 2007
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last visit: Thu Oct 23 15:25 CST 2014
[RELATED]

A vacuum leak would make the engine run rich, it is counterintuitive but what happens is the computer reacts to unmeasured air and richens the mixture.

I would check all vacuum connections, look especially at any rubber elbows, a missing hose that sort of thing. You definately are on the right track though, a bad temp sensor, a bad t stat, intake manifold leak, a tired 02 sensor. Some bad coils causing a miss, a bad amm as you mention. It might be worth having it hooked up to a dealer's scan tool, there would be clues on what to chase down for possible solutions. If it truley is running rich, the catalytic convertor could possibly be damaged over the long term.

Have you pulled a spark plug, are the black, before replacing parts some detective work needs to be done?

DanR '94 964 333,000 miles (99,000 on the new engine)
--
DanR






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