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1999 Xc70 Smooth Idle, Lumpy Up-hill Cold Acceleration V70-XC70 1999

posted by  jokomoto on  Sun Feb 10 16:04 CST 2008
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last visit: Thu Feb 21 18:53 CST 2008
[RELATED]

Strange combination. I swapped out plugs, (went with coppers), checked my coil packs, and am stumped. The lumpy-ness seems to lessen as the car warms up, but is still there. Really bad when cold. No codes. My MPG is also not good, 14mpg. I live in hilly Seattle, but I think this problem is causing my poor MPG.

It feels mechanical. Could it be something like a burnt valve, a PCV problem, exhaust manifold leak?

Any Ideas?






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