Idle problems driving me nuts! - Page 2

TwinTurboGTR · #1 10-28-2011, 11:09 AM

UHG you're right, I'm having another brain fart, its not an EGR system... I'm trying to find it on the diagrams what I am talking about. Ill get back to you.

ripp222 · #2 12-19-2011, 12:21 AM

Quote:

Originally Posted by TwinTurboGTR

UHG you're right, I'm having another brain fart, its not an EGR system... I'm trying to find it on the diagrams what I am talking about. Ill get back to you.

I think TwinTurboGTR is referring to the Secondary Air System. See attachment. Stuck open Non-return valves could allow exhaust gas to get sent to your secondary air pump, but I wouldn't expect this to cause rough idle problems.

I would spend the $35 and review all the SIBs for Group 11 (Engine) and Group 12 (Engine Electrical) on bmwtechinfo.com

SlickGT1 · #3 12-19-2011, 11:41 AM

Quote:

Originally Posted by ripp222

I think TwinTurboGTR is referring to the Secondary Air System. See attachment. Stuck open Non-return valves could allow exhaust gas to get sent to your secondary air pump, but I wouldn't expect this to cause rough idle problems.

I would spend the $35 and review all the SIBs for Group 11 (Engine) and Group 12 (Engine Electrical) on bmwtechinfo.com

Great info, but how does one test/clean/inspect them?

tmv · #4 10-28-2011, 11:53 AM

Just a thought: clean the Idle Control Valve and throttle body.

Mauricio2002 · #5 12-10-2013, 04:18 PM

Changed wiring and MAF, improved but still had a leak.
When removing the oil cap with car running you should hear the air entering otherwise you have a leak. After spraying the intake with carb cleaner no change, meaning no leak in this part. Finally, the shaft seal gave up and sprayed oil on the belt, that grew bigger and came out. After replacing the Shaft seal problem solved! Hope this helps.

TEMA · #6 10-28-2011, 01:55 PM

i too also have the same problem with my 3.0i 2004 11200 miles on the clock. somehow i think the transmission is the culprit of all of this. In my car Neutral / Reverse / and Park don't trigger the irritating idle but as soon as i move the shift to Drive the car begins to vibrate. Now im thinking the transfer case? maybe / tranny itself? maybe I really just hope that someone would point me to a solution.

DrewN209 · #7 10-28-2011, 03:25 PM

Throttle body has been cleaned and I'd love some advice on the idle control valve ... Is there one on the 4.4i ? I searched on if leaning would help and how to and it all related to the 3.0 and I couldn't seem to find where it is on realoem.com

TEMA · #8 10-28-2011, 04:24 PM

Quote:

Originally Posted by DrewN209

Throttle body has been cleaned and I'd love some advice on the idle control valve ... Is there one on the 4.4i ? I searched on if leaning would help and how to and it all related to the 3.0 and I couldn't seem to find where it is on realoem.com

don't know where and if theres an ICV on a 4.4 but i've cleaned mine and nothing no difference in idle.

DrewN209 · #9 10-30-2011, 11:19 PM

Thanks... Yea my idle is barely over 500. When I turn the AC on its jumps to about 650 or so and gets a lot smoother. Can you manually raise the idle ? Possibly an Indy or dealer could just override and turn the idle up a little ?

killcrap · #10 10-31-2011, 06:16 AM

Quote:

Originally Posted by TwinTurboGTR

Very good Drew,
Do not start chasing the problem because it won't solve anything. There are a lot of people on here; and I have done it myself, told the forum here, left and said "Damn, now I'm chasing a damn problem by throwing parts at it!"

Anyways, as far as the rough idle, it sounds like it has to do with the X breathing or emmissions. I would check to see the throttle body and look at that butterfly plate. If it is covered in carbon, that plate may have a hard time properly opening and closing. Carbon may be covering the plate, blocking air flow when the motor is in idle. If it is covered, hit it with throttle cleaner. I've done it on my X 4 times and no problems. You might trigger a CEL but it goes away after a few hours of driving. And emission wise, check the ERG valve a check to see if the valve is sticking, de to carbon build up. Anyone want to concur?

At least these things don't cost any money, well besides the $6 on the cleaner, and $9 for a 6 pack of bud???

the throttle body has no effect on this vehicle when it comes to idling, it is solely used for start up, failsafe and to maintain a 50mbar vaccum for emissions.

Quote:

Originally Posted by DrewN209

Thanks... Yea my idle is barely over 500. When I turn the AC on its jumps to about 650 or so and gets a lot smoother. Can you manually raise the idle ? Possibly an Indy or dealer could just override and turn the idle up a little ?

the idle on the ME9 engine management can be increased by 50rpms, a service function is available to do so