Quote:
Originally Posted by TMR013
Nah, he did try. He actually thought it might be the fasteners on the body stiffener bar (yeah, I know, really technical term) under the hood. He loosend and retorqued the 2 he could get to. He was genuenly stumped.
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This actually makes sense to me! I had the exact same problem on a BMW Z4 about a year ago. Popped when pulling of my driver, braking over bumps, accelerating and sometimes randomly. After trying everything behind the dashboard I searched some forums. I was advise to tighten the strut bars pictured below. When trying the top (boxed in yellow) strut fitting, the bolts where a bit loose.
After tightening all fittings, the popping stopped.
I have just checked the 135 and the top ones are very hard to get to. If I get the popping noise it will be the first thing I try. Has anyone managed to do this to rule it out?
My theory is that they are right behind the dashboard and will loosen over time, this causes the bars to knock/pop when the cars flex. Worked on the Z4 which had the exact same design.
