Massive Idle swing is almost always due to a huge bypass of the MAF/Air flow unit.Originally Posted by pong
Have you checked for a massive vaccuum leak yet?
here we go again...
my car is idling rough again...
here is the problem this time...
when i turn on the car.... the idle swings from 1500 - 1800...
when i turn on the aircon... idle stabilizes at 1200...
when i engage the gear... its at 800...
d problem is when the car reaches operating temperature...
regardless of whether the aircon is on or off... idle swings from 1200 - 1500
when gear is engaged... no rough idle...
help pls...
thanks!
Massive Idle swing is almost always due to a huge bypass of the MAF/Air flow unit.Originally Posted by pong
Have you checked for a massive vaccuum leak yet?
Could you evaluate a bit Ferret?
Think of me as the ultimate NEWB.
My 94 540 seems to be doing the same thing, but not to the extent that "pong's" is. How do I... Check for a hole in the hoses? which one's?
Last edited by rcbrown23; 08-19-2007 at 01:15 PM.
Elaborate?Originally Posted by rcbrown23
Okay, I'll stop being a prick now.Originally Posted by rcbrown23
If it's doing it on a 540i you're going to want to set the car on fire shortly I think... you'll be looking at manifold gaskets or pcv gaskets, both of which are a bitch to do...
Stick your head under the bonnet and see if you can hear the car making a hissing noise while it's doing it, that's usually the first sign.
Ouch. And... Ouch.
Tomato, Potato... I'm hungover
Last edited by rcbrown23; 08-19-2007 at 02:07 PM.
crap... all the hoses... and i couldnt find it...
is there an easy way? tried spraying water on the hoses... so that if engine acts weird... then i have found d air intake leak...
I agree with Ferret. Manifold gasket/vacuum leak. Secondarily, the idle control valve.
ok... im about to dunk this car into the lake...
it recently got a top overhaul... vacuum leak...
which in particulr....
did the water thing to all the lines going to the throttle body... none reacted...
idle control valve... placed a working one in there... no change...
maf too....
seals in oil cover, dipstick are ok...
what else should i look at?
I know it's a different engine, but on my 535 it wouldn't idle at all when the coolant temp switch went bad.