Car question

[sexobon]

Originally Posted by glatt

I've got a car question.

Rough idle. ... After it warms up from driving around ... it goes into an idle where it's pretty rough. ... If I apply a little pressure to the accelerator and ever so slightly rev the engine, the vibrations and roughness go away. It does not have a rough idle when cold. ... It is not rough when driving. This has been going on for a couple months.

That's an unusual combination of symptoms; but, I've experienced something like it. In my case, I noticed that it initially occurred during periods of high humidity and was exacerbated by cold-wet weather. It was a minor distraction that I put off having checked out for a few months until the condition began rapidly deteriorating to nearly disabling the vehicle. It turned out to be a faulty oxygen sensor which I had replaced under warranty.