M60 rough idle
I just purchased a 540i auto, my second e34. I got a rough history of the car, but very few records so it is hard to tell what has been maintained.
I have done a search through the threads and have some ideas about what might be the cause of the problem, but wanted to get an idea of what to do first.
The problem: heavy vibrations at idle, O2 sensor code.
My question: What are some good ways to diagnose this without running out and buying a bunch of expensive parts?
so far I have taken the covers off to check for oil around the plugs. There was just a small amount toward the rear. The rest looks dry. I guess I should take the plugs out to see how they look. I believe they were replaced within the last few years / 40k miles but theres no way to know for sure.
I'd like to check for leaks. Does anyone have a diagram or can explain where to look for vacuum leaks?
Thanks in advance.
5-10 Grand Master
almost certainly it's the pcv plate on the back of the intake, you can squirt around the intake with carb cleaner and see if the idle changes, slim chance it's crappy plugs or a failing maf but if it runs good other wise it's probably not a maf, we just had a couple threads on doing the intake job and someone will probably post them up if you can't find them
all america wants is cold beer warm cat and a place to take a poop with a door on it
check your intake gaskets.i also had a rough idle and did plugs o2 sensors etc but still had probs.since i had the intake gaskets done in now idles and runs
like a dream.
good luck
geoff
Major Contributor
Search for Gearhead's post from last week.
Ramon
1994 540iA Nikasil EAT Chip
Tampa Bay, Florida USA
4 Grand Master
Agreed
4 Grand Master
So Winfred... you said "what snow?" Guess you should have kept your mouth shut... LOL. I heard there was a massive whiteout at Flagstaff, AZ that caused a massive Highway 40 accident.
Major Contributor
i had the same thing with my 540i/a when i bought it.......
it turned out the cats were blocked shut.
i found this out after replacing the intake gaskets, pvc plate, & 02 sensors.
tim s.
Last edited by tim s; 03-17-2008 at 08:53 AM.
Super Moderator
5-10 Grand Master
huh?! i am in loserana so bring it on i dare it to snow
Originally Posted by Tiger
all america wants is cold beer warm cat and a place to take a poop with a door on it
4 Grand Master
Mmmm... Maybe I got you mixed up with BillR... since when did you live in Lousiana?
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