96 Civic, 78,000 miles, automatic transmission.
I posted about this a few weeks ago. The RPM on my civic is
hunting/oscillating by +-200 when driving at roughly 35mph up a light
hill with the correct throttle position to maintain that speed. It's
indicated on the gauge, by changing engine sound, and by very gentle
thrusting forward whenever the RPM increases. Imagine the RPM needle
going up and down about once or twice per second.
Curly advised checking the TPS (no problem found) and using injector
cleaner which I've done. jim bean suggested checking the ECU codes but
nothing was stored.
Does anybody else know what might be causing this problem? Is it likely
the throttle body needs cleaning.
I used STP cleaner. My local garage said they have some stronger stuff
which isn't available over the shelf. Is that safe to use?
Finally my local Honda dealer said they are willing to sit in the car
for a drive to try and diagnose (free of charge). I'll do this as soon
as I have some time.
Thanks again for any advice. I'd love to get to the bottom of this small