Really hope somebody can give me a hint. The (long) story (there's
always a story before the problems starts J)
I have a 316i Compact from 1998 (the M43, 1.6 liter 4 cylinder engine)
that's done around 200.000km. Just bought the car, and the car had a
rough idle especially when warm. Not very rough but a little like the
revs were a little too low. (Engine oil, sparkplugs and so on are
Read here about cleaning the ICV and thought that might do the trick.
The ICV is really easy to get on the M43 engine, so took it off and
cleaned it with some "electronics cleaner" (I think it's basically
alcohol of some sort). While I was at it I also removed what I think
is the "throttle positions sensor", but nothing to clean here so put
it back on. Next I cleaned the part of the MAF that is visible from
inside the air-intake, by spaying it with a little "electronics
I let it all dry and then tried to start the engine. Now the car won't
idle at all. If I turn the key without pressing the gas pedal it
starts, goes to around 1500 revs for half and second and then it just
dies. If I press the pedal and make it stay above 1700-2000 revs, the
engine keeps running, but the second I let go off the pedal the revs
drops and it dies. If I push it above 3000 revs it doesn't sound
great. Maybe like it misfiring and not burning all the fuel, but
haven't experimented much with this.
I have of course tried to take the ICV of again, checked that it moves
ok. Also checked all the connections and so on - everything looks
I sounds like something has been broken while cleaning it. But which
part? (of course really stupid to take three parts of at once - but
hey thought I could save some time) Can I be relatively sure it's the
ICV acting up with problems like this or does it sound like the MAF?
Any hints/ideas before I just start from one end switching parts.
Oh maybe this means nothing, but the gasket that was between the
engine and the ICV was old and cracked when I removed the ICV. So it
might be getting a little false air here, but can that make the car
not want to idle at all? It's not like the car is stalling "slowly",
the revs just drops. There's no warning-lights in the dashboard
indicating any faults with the engine.
Hope my description made sense - a bit hard to explain technical stuff
in a different language.
Anyway thanks for the time to read it - really hope for a hint or an
Thanks in advance :-)