11-21-2022, 09:37 PM | #23 | |||
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11-23-2022, 07:07 AM | #24 | |
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papasmurf_m3454.50 |
11-24-2022, 01:53 PM | #25 |
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I'm guessing that's #6, that 105psi compression is heck of low for these motors as you might have damaged the piston/ring. What I do, is drive the car till engine is hot, come home, let it sit for half hour, remove everything and conduct test for best results. Rule of thumb is that all cylinder's variation should be 10% between the highest and lowest readings.
A new motor typically is 180-200psi, after several thousand beat down miles they hover around 145-160psi and that's what I'm used to. The best advice I can give from my past builds, is conduct a compression test prior to modifying so you have a baseline and conduct once/year or six months to check the health of motor.
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TopJimmy5461.50 papasmurf_m3454.50 |
11-25-2022, 07:19 PM | #27 |
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06-05-2023, 12:23 PM | #29 |
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How did you find that out? I'm having a misfiring issue with my 2015 m4, stage 2 catless. I had a valve cover gasket leak, so replaced that just that I figured its time for a spark plug change, since its been over 30k miles, but before that never had any misfires.
I had new BMW High power spark plugs, read that its better for flex fuel, gapped at 0.020, misfired at 4k under full throttle immediately. Codes for injector 5, and misfires happened Mechanic thought it was coils, I bought 6 new dinan coils, still misfired and installed a new injector, misfires were still there. I asked him to just changed the plugs to 97506, gapped at 0.022, misfires are gone and driving strong! After 2 tanks of 93, and 3 tanks of full e85, the misfire is back at ~4k RPMS, but this time there are no codes.. even when i purposefully floor it to have it misfire, it just wont throw any codes, just sounds like my MHD antilag. I guess I could look at my intercooler if its empty, or loose fittings for the intake etc... |
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06-11-2023, 05:46 PM | #30 |
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How do you know it was a timing issue? My misfire issues still isnt resolved, I just changed my own plugs out today, installed new plugs again, and still wont go past 4k to 5k rpms with full throttle, no check engine light. half or even 60% throttle it revs fine.
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08-10-2023, 10:48 AM | #31 |
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I have been having the exact same issue in cylinder 4. Changed plugs coil packs injector spark plugs the whole 9. Tried all different mixtures of ethanol and no improvements. I’m left with a compression test and leak down I guess. Any insight from anyone or are more people experiencing this too?
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08-11-2023, 08:00 AM | #32 |
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I have the same issue for the last few months.
Misfire at >6k rpm on sport plus and a good pedal push. Spark plugs are relatively new. I was gonna change the coils, but after reading the thread, I may wait. BMW AD couldn't figure it out. No codes. M4, bone stock, well maintained, 100k miles. Any idea? Thanks
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10-14-2023, 01:18 AM | #34 | |
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It was the damn DINAN COIL PACKS!! After having new plugs, new coils, new plugs again, new valve cover. I bought new delphi coil packs and my car is butter smooth again! |
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