Hi everyone,
My wife has a '99 Corsa 1.7 Diesel (the Isuzu engine). Normally it's fine, but it doesn't seem to like wet conditions - if left to idle, it tends to rev up and down quickly. Similarly it's a bit rough when driving, it can be quite jumpy at low speeds but is ok once you get above 30 or so.
Something I thought might be related - very occasionally, while driving the rev counter will drop to 0 and then jump back to the correct point. I wondered if some kind of sensor was getting affected by water and maybe causing both symptoms?
Thanks,
hajo