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Poor mileage S90-V90 1998

posted by  someone claiming to be sevenvolvos on  Wed Nov 28 11:38 CST 2007 [RELATED]

Group:
I am in need of informed opinions as to the possible causes of poor mileage.
I am convinced that my '98 S90 is running too rich.
Current mileage in suburbia with some 60 mile RTs on urban interstates and a few state highways is about 16 mpg on regular. Maybe a few 5 mile round trips as well.
Not cold in N Jersey with 40+ days.

One indication is that at a start, the engine seems to run rough even before the air pump starts. After warm up the engine is smooth again.

What are the possible things I could change, one at a time, to see any improvement?
Knock sensor? I can get one fron e-bay.
Coolant temp sensor? Don't know where it is located. Not the one that goes to the gauge.
AMM? Can get one off e-bay.

What else is there?
Consideration should be given to the difficulty of changing.
Items from e-bay can be re-sold at a later date if there is no apparent change.

Who can help?

-- S' V'






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New Poor mileage [S90-V90][1998]
posted by  someone claiming to be sevenvolvos  on Wed Nov 28 11:38 CST 2007 >


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