03-17-2024, 03:35 PM | #1 |
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F30 N55 sudden shake at idle and shaking on highway
Hi guys,
I had a bad plug a month ago, cyclinder 2, but I replaced all of them with Bosch OEM, I also found out that my #4 coil was also broken so replaced that as well. And now after a month the car shakes on the highway no matter what the speed it, idle is rough. Shakes for a second when stopped in traffic and I don’t have any codes on the dash. Should I push the car a bit for it to throw a code. The car also doesn’t sound good at all. CAR IS STOCK TIA |
03-17-2024, 03:39 PM | #2 |
(formerly exe36M3)
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Probably another coil - people tend to replace all 6 of them versus just one or 2.
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Andrew25121.00 |
03-17-2024, 04:48 PM | #7 |
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I bet if using ISTA+ it will show some hidden (BMW specific) codes that can clue you in to the source. You can buy a $10 ENET cable on Ebay/Amazon and there is a thread on ISTA+ download.
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03-17-2024, 10:40 PM | #9 |
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If you REALLY want to keep testing and you don't have a reader the easiest way is to just unplug a coil and start the car, no change... make note, reconnect and move to the next one.
With a good coil, the unplug will dramatically affect the car - sputters, shutters, chokes, etc. With a bad coil, nothing will happen... and that's the bad one. Coils aren't known to last forever. My son got 145k out of his 328i/E90 coils before the car started choking, stalling, stumbling. Replaced, problem solved. I'm at 81k on my 435i. Still going but have a set just in case. I advocate replacing all 6 versus one simply because, the other 5 WILL fail at some point.
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03-19-2024, 01:38 PM | #11 | |
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Quote:
If you made it worse by replacing plugs/coils you probably cracked a plug on install or damaged a coil... You need a code reader as mentioned above. CEL and "codes on the dash" are totally different than connecting to OBD |
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03-22-2024, 12:18 PM | #13 |
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So where's the misfire now based on the code read?
Silly idea... did you make sure the coil is pushed all the way down onto the plug? So it makes a snap/pop/click sound? I worked on my 435i once, changed out all the plug and the car misfired like crazy. Turned out, I didn't push one of the coils all the way down.
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03-23-2024, 01:04 PM | #14 |
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Are you using a torque wrench when installing plugs? If so what are you torquing them to? I had a similar issue before I started using a torque wrench. The thin wall plugs crack the porcelain if overtorqued.
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