This is a new engine, it has 6500 miles on it, with a 90000 miles warranty. It's fuel injected. It started missing about 3000 miles ago. A mechanic has checked out everything obvious, such as plugs, wires, rotor and cap. He swears it is not an internal engine problem, because the missing has been a little intermittent, and doesn't seem to occur on acceleration at all. However, I replaced the O2 sensor and now it appears to be mssing very regularly: at 20mph in 2nd gear, 30 mph in 3rd, and 40 in 4th. It does well when I accelerate, and at idle, and at high speeds. I get very good mileage on the freeway.
The fuel pump has also been replaced, and the tank cleaned out.
Could it be a vacuum problem? If it is an internal engine problem, won't it show up on a compression check? I disconnected the O2 sensor a couple of times, and although the CEL light came on, it only stayed on for a a few miles and went off again. Doesn't that point to a computer problem?
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Sunday, December 7th, 2008 AT 6:05 PM
