View Full Version : Occasional 525i M50 Engine Misfire Problem – Solved


stilljester
01-20-2007, 09:42 PM
Well I can't say I've ever seen this happen before….
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In the past few months I had several issues with the car running a bit rough off and on. It seems there was no pattern to it at the time but looking back no it normally followed rain. A majority of the time it would run rough then after 30 min smooth out no problem. Last week it started again and unlike before the "rough running" wouldn't stop. I thought it was most likely the coil packs since they had 200k on them. I was more or less correct. <o:p></o:p>
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I first tested to make sure the coil packs were receiving power - Sure enough 12v.<o:p></o:p>
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Next I checked the resistance on each pack - All tested between 0.4 - 0.8 ohms. I then noticed a bit of rust underneath the coil pack closest to the firewall. <o:p></o:p>
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As I went to remove the coil pack it acted stuck. I gave it a good tug & the bottom of the boot immediately broke and pulled off revealing.... ICE!?!?!<o:p></o:p>
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http://images20.fotki.com/v380/photos/9/925706/4521563/CIMG0115-vi.jpg<o:p></o:p>
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Once I removed all of the rubber chunks/ice/water and replaced the boot the car is back to its old self. (Running Great) I’m reasoning water was seeping in after rain storms & shorting out the dry rotted plug boot. The car would then start running rough - after some time the water would evaporate off and a normal idle would return making diagnosis difficult. Luckily this past week the weather had been cold creating ice otherwise I may have never noticed it.<o:p></o:p>
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Just thought I put this out there incase someone else was having a similar issue.<o:p></o:p>

kesslerbmw
01-20-2007, 10:07 PM
Ive been fighting a smiliar problem for 2 weeks on one o fmy cars. I think Im going crazy. Mine doesn't get any moisture down there though. Good to hear yours is solved.

atl530i
01-20-2007, 11:29 PM
Wow, that is probably the strangest things I've seen happen to a car in a long time.

Antrieb
01-21-2007, 12:22 AM
Nice fix. I had a similar problem :)

atl530i
01-21-2007, 12:32 AM
Nice fix. I had a similar problem :)


I had that problem also. But damn that is in my top 10 for most weird things to go wrong with a car, lol.