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      02-24-2026, 04:01 PM   #1
335xiE90
Private First Class
United_States
45
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101
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Drives: BMW 335xi
Join Date: Jul 2022
Location: Massachusetts

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Need help with surging

I recently started experiencing surging in 1st and 2nd gear at lower RPMs. It almost feels like I suddenly forgot how to drive a manual.

I just replaced the spark plugs with one-step colder plugs, initially gapped at .022 and then tightened to .020, but I didn’t notice any difference between the two. I’m also running brand new coils and a new LPFP. I'm seeing no codes in MHD.

Does anyone have suggestions on what I should be logging to help diagnose the issue?

Last edited by 335xiE90; 02-26-2026 at 01:36 PM..
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