Hi, I'm new to the newsgroup, but can't seem to find my problem here...
I hope that you can help.
I have two problems, I'm not sure if they are related or not. The first
is minor. My oil pressure gauge works perfectly at idle, or if the rpm's
are less than about 1200, but as soon as you step on the gas, the gauge
goes crazy; up, down, and sometimes just pinned to the max side of the
The other problem is the major one, but is intermittant. Once every
couple of weeks, the car seems to lose its minimum idle speed. Normally
it never idles much below 1000, but in this case it seems to cycle
between 500 and 1000 about once every five seconds. The cycling is very
rhythmic. Sometimes it stalls at the low end of the cycle. No error
codes. I believe it has happened once or twice with a warm engine, but
mostly with a cold engine.
I can solve the problem by turning off the engine, waiting five minutes,
and restarting. (kind of like a microsoft solution).
I'm wondering if it is electrical -- some sensor, or the wire leading
from it, but what sensor would cause this situation?
one possible related thing... I had to replace a cat a few months ago
when I had my car inspected. Could a faulty O2 sensor have given these
symptoms and caused the cat failure? I don't want to lose another cat.
92 Sunbird, 3.1L V6, Auto. 230,000km
Thanks for any suggestions