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Discussion Starter #1 (Edited)
Hi,

My car 520i 2002 model has the rpm not stable when idle and car shakes then switches off, (I can provide a video if needed). The mechanic recently cleaned the throttle body and I noticed that he broke a rounded plastic piece that usually seen on the MAF (picture attached) any idea what is the problem and could that plastic piece involve in such issue.


Thanks in advance
 

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ALGhoul
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Hi there is no problem with the plastic mesh broken inside maf any way your first thing is to check for vacuum leak hoses
Then you have to scan your car
And check your fuel pressure on the sharder valve on fuel rail and tell us the reading
It could be your fuel pump
Fuel pressure regulator
It could be your maf try to clean it with electronic cleaner
Its may be your crank sensor problem but not suspected
All depends
And good luck
 

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Discussion Starter #3
Thanks for your reply sroor,
I forgot to mention that this problem is happening after replacing the engin and gearbox from 520I to 525I, now when ever I put the shift to N or P the car goes off, I well check what you mentioned
thanks a lot
 
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