How to resolve an uneven idle?

[Freddy]

Originally Posted by NYCSterling

funny.. i have noticed the same with my 2006 4.4i. when i am stopped at a light with foot on the brake - i feel a vibration... as if the idling is set too high.. i never noticed this before and was thinking it may be because the temp drop outside? I was never ever able to feel the engine thru the steering wheel.. it was always a silent idle.. Now I can feel it quite easily.

I am just shy of 60K, and need to do the InspectionII.... so maybe its time to change plugs etc.....

same same same for me. replaced my motor mounts. problem solved

[bds325is]

I have a cold start miss or rough idle..but once its warm she purrs...i just bought a used 05 -4.4 w- 80k ...my mileage is at 15-16mpg normal?
Im guessn I should start with plugs?

[mywidebody02]

Originally Posted by bds325is

I have a cold start miss or rough idle..but once its warm she purrs...i just bought a used 05 -4.4 w- 80k ...my mileage is at 15-16mpg normal?
Im guessn I should start with plugs?

I had a week battery and that fixed my problem when I replaced it. Battery was 6 years old.

[hambone1983]

well i filled my gas tank as usual with premium, but before the fill i added 2 bottles of techron fuel system cleaner. each bottle was 10 oz hence i used 2 bottles since the bmw bottle is 20 oz.

a big change, no more uneven idle and it feels great. Biut i will keep in mind about the motor mounts. How much do they cost to replace?? Could they be covered under CPO?

[Naz24]

Originally Posted by hambone1983

well i filled my gas tank as usual with premium, but before the fill i added 2 bottles of techron fuel system cleaner. each bottle was 10 oz hence i used 2 bottles since the bmw bottle is 20 oz.

a big change, no more uneven idle and it feels great. Biut i will keep in mind about the motor mounts. How much do they cost to replace?? Could they be covered under CPO?

I may do the same with mine. And I'm just out of CPO so are motor mounts an easy diy?

[c4racer]

Originally Posted by Naz24

I may do the same with mine. And I'm just out of CPO so are motor mounts an easy diy?

I haven't done them, but I can't imagine they are easy to do. Certainly within the realm of DIY and I wouldn't think twice about doing it myself. You will need something to support the engine - either a hoist from top or a jack from the bottom.

[Naz24]

Originally Posted by bds325is

I have a cold start miss or rough idle..but once its warm she purrs...i just bought a used 05 -4.4 w- 80k ...my mileage is at 15-16mpg normal?
Im guessn I should start with plugs?

That's the mileage I'm getting. At about 87k now. I think I'll be doing the spark plugs soon.

[Freddy]

Originally Posted by hambone1983

well i filled my gas tank as usual with premium, but before the fill i added 2 bottles of techron fuel system cleaner. each bottle was 10 oz hence i used 2 bottles since the bmw bottle is 20 oz.

a big change, no more uneven idle and it feels great. Biut i will keep in mind about the motor mounts. How much do they cost to replace?? Could they be covered under CPO?

not covered under CPO..."wear and tear" item...but i bitched and got it comped. ...$980.00

[wayneX5]

Hi all. This is my first post here. I've been tracking this post because I think I am experiencing similar symptoms to some of what described in previous post. I first started noticing something felt different with my X5 back in Oct. Incidentally that's when I crossed 50k mile mark. I've replaced all four rubbers and battery with new since. What I'm feeling is a slight but noticeable uneven running of the engine (or vibration) from idle to highway speeds. I can feel it in the steering wheel and the gas pedal. At idle when at a stoplight, with the A/C of, I can tell the rpm seem a bit low and vibration noticeable. If I turn the A/C on I notice the rpm increase a bit and vibration sometimes not noticeable at all. When the vibration is noticeable I also noticed that power feels lacking in the second gear range when moving off from a stop (transmission in full auto). Now that it is really cold, when I run both seat and steering wheel heaters, doesn't seem to affect. There is no fluctuating interior lights either. One common thread I noticed from the different posts is that the idle issue seem to show up after 50k milage mark and common to X5 4.4's. I have aftermarket intake filters installed now for several years and I have not cleaned it, ever, so I will check that first. I find it hard to believe that engine mounts are bad already but I will also check some of the other suggestions. I'll keep you all posted.

[Freddy]

Originally Posted by wayneX5

Hi all. This is my first post here. I've been tracking this post because I think I am experiencing similar symptoms to some of what described in previous post. I first started noticing something felt different with my X5 back in Oct. Incidentally that's when I crossed 50k mile mark. I've replaced all four rubbers and battery with new since. What I'm feeling is a slight but noticeable uneven running of the engine (or vibration) from idle to highway speeds. I can feel it in the steering wheel and the gas pedal. At idle when at a stoplight, with the A/C of, I can tell the rpm seem a bit low and vibration noticeable. If I turn the A/C on I notice the rpm increase a bit and vibration sometimes not noticeable at all. When the vibration is noticeable I also noticed that power feels lacking in the second gear range when moving off from a stop (transmission in full auto). Now that it is really cold, when I run both seat and steering wheel heaters, doesn't seem to affect. There is no fluctuating interior lights either. One common thread I noticed from the different posts is that the idle issue seem to show up after 50k milage mark and common to X5 4.4's. I have aftermarket intake filters installed now for several years and I have not cleaned it, ever, so I will check that first. I find it hard to believe that engine mounts are bad already but I will also check some of the other suggestions. I'll keep you all posted.

Motor Mounts can go bad at any point on any car from mile 1 to mile 500,000 ...its a roll of the dice. and X5 motor mounts are hydraulic