Rough idle in cold weather. - Page 2

Brandon002 · #1 01-20-2014, 11:30 AM

Is this the part?

Your Parts Search Returned 1 Part(s)

giodog2000 · #2 01-20-2014, 11:43 AM

brandon, FYI , I called the dealer and they are 34$ each (cnd)

Brandon002 · #3 01-20-2014, 11:47 AM

Yeah, I'll order mine from Autohaus and get two for the price of one at the dealer.

giodog2000 · #4 01-20-2014, 12:09 PM

I'll shop around when i get home.
Hopefully this time it'll be a cheap fix.

Whitecat · #5 01-20-2014, 09:36 PM

Hey Gio i got that too!... There is few diagnotics but since i have some leaks from valve cover gasket and can be corrolated with misfire (they say..) i will fix it at the garage...here is a link of discussion
http://www.xoutpost.com/bmw-sav-foru...-bronco-2.html

TwinTurboGTR · #6 01-21-2014, 07:54 AM

A leaking valve cover just boils down to a vacuum leak. Any air that is unmetered after the MAF will cause the motor to run funny. Now with the valve cover, if there is a very very slight leak, you will not notice a difference... but if the leak is severe enough, sure it will cause a misfire issue. While IL's are the official "fix" for BMW NA, but a lot of people have reported to do the fix, only to have the problem come back the next year.

To do a simple search, remove the diaphragm and check for the cheese... I've also realized that spring is also very critical... When I replaced the ones in in mine... just to see, I measured the springs... Now I know this isn't the official correct way because there is alot of variables, but just taking measurement with a set of dial calipers, the old ones compared to the new ones, there was a difference of .003... Old ones, I had a rough idle. New ones, idle fine. New diaphragm old spring, rough idle. Old diaphragm new spring, idle is fine. So the tension of the spring is important. If you can't remember when you replaced yours, it's a cheap enough fix to do.

Whitecat · #7 01-22-2014, 10:46 PM

Quote:

Originally Posted by TwinTurboGTR

A leaking valve cover just boils down to a vacuum leak. Any air that is unmetered after the MAF will cause the motor to run funny. Now with the valve cover, if there is a very very slight leak, you will not notice a difference... but if the leak is severe enough, sure it will cause a misfire issue. While IL's are the official "fix" for BMW NA, but a lot of people have reported to do the fix, only to have the problem come back the next year.

To do a simple search, remove the diaphragm and check for the cheese... I've also realized that spring is also very critical... When I replaced the ones in in mine... just to see, I measured the springs... Now I know this isn't the official correct way because there is alot of variables, but just taking measurement with a set of dial calipers, the old ones compared to the new ones, there was a difference of .003... Old ones, I had a rough idle. New ones, idle fine. New diaphragm old spring, rough idle. Old diaphragm new spring, idle is fine. So the tension of the spring is important. If you can't remember when you replaced yours, it's a cheap enough fix to do.

Thanks for this!

rph74 · #8 01-21-2014, 03:33 PM

Another thing to consider is the throttle body gasket. This was a problem for me on 2 different M62 motors that I have owned.

Clockwork · #9 01-21-2014, 03:49 PM

incase anyone has not seen this, its a nice vid to show HOW easy it is to do on the N62 engine
https://www.youtube.com/watch?v=FBy0tRn2xLw

giodog2000 · #10 01-21-2014, 07:10 PM

Great info guys... thx

We are having another "extreme" cold weather wave this week here in Montreal but as soon as it warms up a little , I will have this done and report back. But , I've been revving the beast a little more the past few short trips to work and I must say the rough idle was not as noticeable this morning...