So I went on a 20 minute ride to get a haircut. After I was done (about 30-40 minutes later) I started the car and the idle was fluctuating from 700-1000 while stationary. I drove a few minutes and eventually it stopped doing it but why would it do that when the car was already warmed up?
Idle fluctuating from 700 to 1000 after 40 minute rest?
1 - 19 of 19 Posts
Joined
·
160 Posts
My car did the same thing. I *****ed/moaned/complained to the dealership and it fell on deaf ears. Got my oil changed a few weeks ago and low and behold the car does not idle crazy anymore.
The only downside to the dealership changing the oil is that now my car is a little quieter. They did not install the foam pad thingys in the air intake system.
My car was extremely loud at startup (stock exhaust/stock everything) and it was kind of cool. Now, the car is behaving itself and I'm worried.
The only downside to the dealership changing the oil is that now my car is a little quieter. They did not install the foam pad thingys in the air intake system.
My car was extremely loud at startup (stock exhaust/stock everything) and it was kind of cool. Now, the car is behaving itself and I'm worried.
Joined
·
160 Posts
I take that back. My car still fluctuates wildly at idle. Both cold and warm startups.My car did the same thing. I *****ed/moaned/complained to the dealership and it fell on deaf ears. Got my oil changed a few weeks ago and low and behold the car does not idle crazy anymore.
The only downside to the dealership changing the oil is that now my car is a little quieter. They did not install the foam pad thingys in the air intake system.
My car was extremely loud at startup (stock exhaust/stock everything) and it was kind of cool. Now, the car is behaving itself and I'm worried.
What's bizarre is that after another 6 hrs of sitting, no fluctuation on the idle
So, I came back at work at 12:30 and had the car parked for 6 hrs. Started it up and it idled perfectly. Obviously something is going on otherwise it would be more consistent than that. Either steady idle at every start or fluctuating idle at every stop. Why is it flip flopping?I take that back. My car still fluctuates wildly at idle. Both cold and warm startups.
mine too and stalls... I pulled out some spark plugs and it had oil on the threads and tip.... any idea?
These motors are built kind of loose which is why they burn so much oil. Loose is fast but as a result the car will burn oil when you beat on it. Burnt oil is just oil slipping past the piston rings so I would think to see a little oil on the plug is not completely out of the ordinary. How much oil is supposed to be there, I am not sure.
My car idles like pretty bad when I first start it up, hunting up and down trying to find it's way. I've never had an issue after warmed up.
At 30K miles I believe the plugs are supposed to be changed, so if your car is coming up around that milage maybe it's time to change the plugs. (don't quote me on the exact mile for the plug change but I know it's around there).
Check your idrive, it will tell you when the plugs need to be changed.
Joined
·
686 Posts
I am very affraid that this may be a failing fuel pump. It was very common on BMWs with the N54 engine. Here's a link to the class action lawsuit: Lemon Law Search Results for bmw 335
Are you sure about that? The failing HPFP on the 335is literally put the car in limp mode. The rough idle I was talking about when I started the thread is just that, rough idle and it only happens after you run the car hot, turn it off for a while and start it back up. Doesn't sound like a fuel issue to me. It sounds more like an ECU programming issue.
Joined
·
686 Posts
I'm not to sure, my father has a 2007 335xi but I don't think he has ever experienced somehting like this. The oil temps though... 270 degrees. I suggested that he get the Sports Package with the Oil Cooler but well, he din't. Just thought I'd mention it though. I've found video tapes go a long way with the mechanics at the dealers. If you experience it try to video tape it.
I have the rough idle problem as well (somewhat)... I start the car up when the engine is cold and the idle fluctuates from 750-1000RPM for a 5-10 seconds but smooths out quickly. I was concerned at first but I don't seem to be having any problems with the car and this only happens on a cold start. I am a little nervous about winter though if the cold is what causes the fluctuation at start-up. We'll see how it goes. The car is still under warranty until next July, so I can always bring it to the dealer if something is wrong.
Joined
·
103 Posts
. . . consider also that either a small vacuum leak or a dirty air idle control valve could cause idle fluctuations. If your car is out of warranty and/or if you like to tinker, you might try cleaning the ICV. There are instructions all over the internet for various car. One might be relatively applicable to our cars. Good luck finding a vacuum leak.
The cold rough idle happens on all E60 M5s as far as I know
The OP was about rough idle after the engine has been run hard, then turned off then turned on again.I have the rough idle problem as well (somewhat)... I start the car up when the engine is cold and the idle fluctuates from 750-1000RPM for a 5-10 seconds but smooths out quickly. I was concerned at first but I don't seem to be having any problems with the car and this only happens on a cold start. I am a little nervous about winter though if the cold is what causes the fluctuation at start-up. We'll see how it goes. The car is still under warranty until next July, so I can always bring it to the dealer if something is wrong.
My car does this as well intermittently warm or cold -- generally notice it more right after starting the vehicle (even if it was just turned off). It actually bounces between 550 to 950 rpm before randomly stopping. The tech ran some tests at the dealer and thinks its the vanos pump in my case...
FYI: In really cold weather, the rough idle will last longer than 5-10 seconds
Possibly up to 30-45 seconds.I have the rough idle problem as well (somewhat)... I start the car up when the engine is cold and the idle fluctuates from 750-1000RPM for a 5-10 seconds but smooths out quickly. I was concerned at first but I don't seem to be having any problems with the car and this only happens on a cold start. I am a little nervous about winter though if the cold is what causes the fluctuation at start-up. We'll see how it goes. The car is still under warranty until next July, so I can always bring it to the dealer if something is wrong.
Joined
·
686 Posts
My Dad paid a visit today and as we went out to get something at the store the car sat for about 50 minutes. When we went to go start it up, it noticed a similair problem to the one decribed in your post, odd.
1 - 19 of 19 Posts
Join the discussion
BMW M5 Forum and M6 Forums
M5Board is the best forum community for information on the BMW M5 E60 (V-10), E39 (V-8), E34 (straight 6), E28, F90 and F10. Discuss performance, specs, reviews and more!
Full Forum Listing
Recommended Communities
Join now to ask and comment!