Good day/night.does anyone exp a rough idle on there 545,mine is driving me crazy.spoke to my boy at who works at the dealer and he said thats a common problem on the 45s,..just guessing maybe someone exp and got rid of the vibration.thanks....

 

Engine mounts?

Cany feel where the vibration comes from? Like is it from behind, below you or infront. Or just all around.

 

hey, i had a problem onmy 530i for a while, it would idle rough, but after 3-4 months of running to the dealerhip and back, they finally found the problem. It was a wiring problem witht he transmission. Some important wire was loose or damaged from the transimission to engine which caused the problem.

 

all around like more engine vibration

 

mine was a engine vibration too, next time you go to dealer just ask him to check the transimission wiring

 

I sporadically experienced a rough idle on my 545i this winter. This typically happened in the morning after a cold start, and also a few times after getting off the freeway and stopping at a traffic light.

I talked to the dealership and the senior tech said he has heard of numerous complaints over the last few months. He said, "let me guess, you use high-octane Sunoco gas", and that is exactly what I had been using. Apparently, Sunoco in this area had been mixing a higher than normal level of ethanol in their gas due to the extreme cold. My shop tech said the 545's and 550's are especially sensitive to that ethanol. I switched to Shell and after 2 tanks, the problem seems to be gone. I thought I saw someone else on this forum mention a similar issue. I think he just mixed some dry gas and problem went away.

For my case, the weather outside also got considerably warmer, so I'm not sure if it was a related issue?
Let us know what you find out.

 

Hey dropped545, I had the same problem on startup. There was a rough idle that caused the rpm gauge to jump like a hopping rabbit. There's an SIB out on this issue I'll have to look for it, perhaps Rudy can assist on this. I took this SIB to the dealership and they ended rebuilding the engine. there were some control levers that had to be replaced in. I think it was all 16(2 per cylinder if I'm correct). It took about three weeks and cost the dealership something like 8k. But it was fully covered under waranty, so I would suggest if you are still under warranty to have the dealer do this work before its up. It did solve the problem for me, for the most part 97%.

Hope this helps.

 

thanks...

 

mine does it during cold idle...as soon as it goes to warm idle, it smooths out. Got a software update to fix it, which it did for a month or so...now it's back. Maybe I'll try swapping to Shell gas

 

SIB_Rough_Idle.pdf

I have attached an SIB for rough idle. If you have this problem at cold starts then lifters needs to be replaced. I had this issue in the past.