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Sudden drop in gas mileage S90-V90

posted by  Mike L on  Tue Nov 22 08:15 CST 2005
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last visit: Sat Jun 29 12:04 CST 2013
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Thanks for your reply, Poolman; I've been monitoring this board since I bought this car, and it's clear you have a lot of experience with these cars, and you provide excellent advice. I will check the things you listed, but I expect to find the cam timing to be OK. My guy is pretty good, and the mileage drop showed up for several tankfuls before the timing belt was changed. I had hoped that replacing the air filter and spark plugs would make a difference, but it didn't. My mechanic also said that we'd look for codes implicating the O2 sensor, since the sensor is the original as far as I know -- at least I haven't replaced it since I bought the car at 74K. Also, the spark plugs I took out looked great for color, with no indication of either rich or lean conditions.

Can you elaborate a bit on your suggestion to replace the ends on the vacuum hard lines? Is this trimming the ends of rubber hoses (perhaps hardened with age) and re-plugging them onto hard lines?

Thanks again for your help. I'd like to see if I can make this one go as long as my dear departed '82 245, killed in the line of duty at 422,000 miles (no internal engine work at all), protecting my son from from someone making an oncoming illegal left turn in front of him.

Mike L






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