Welcome all my puzzle solvers, for I have quite the challenge.
Quick back story. Recently undertook a massive project on my 03 E46 M3. ~147k miles. I essentially did a big overhaul and been wanting to auto/track the M (Big dream of mine).
Problem:
Rough idle/cabin shake @ 850rpm with warm engine. When I bring above 950-1k rpm it smooths out.
I have no initial start-up problems and runs super smooth. As it warms and rpm starts to decline, the shake sets in.
Parts I've upgraded or cleaned:
Engine:
Transmission:
Exhaust?
There is a ton more. I may be forgetting some stuff or it's not needed for the issue at hand. So please ask away. I am seriously stuck. She drives beautifully, engine not only sounds strong, but feels amazing. Your ideas or inputs will be greatly appreciated.
Notes:
I have done everything myself. Always made sure to torque-to-spec (At least I believe, keep second guessing myself).
I understand with these firm mounts I would be receiving more feed back from the engine/trans, but I don't think to this extent?
I have ordered a new ICV and Coils.
Quick back story. Recently undertook a massive project on my 03 E46 M3. ~147k miles. I essentially did a big overhaul and been wanting to auto/track the M (Big dream of mine).
Problem:
Rough idle/cabin shake @ 850rpm with warm engine. When I bring above 950-1k rpm it smooths out.
I have no initial start-up problems and runs super smooth. As it warms and rpm starts to decline, the shake sets in.
Parts I've upgraded or cleaned:
Engine:
- VANOS (rattle kit/o-rings/oil line/timing chain guide)
- Valve adjustment / timing
- Spark plugs (NOT INGINITION COILS) <--- Initial start to fix shake/idle
- Cleaned and tested fuel injectors
- Cleaned ICV
- Removed ITB's and thoroughly cleaned. (new o-rings)
- Rod bearing w/ ARP bolts
- New oil pump
- Fuel filter
- REVSHIFT Poly engine mounts (95A)
- Chase bays Power steering kit.
- New O2's
- PSDesigns Velocity Stacks w/ IAT and TTFS Alpha-N tune. (Tune is just a basic one for I can't really go to them to have them specifically tune it. Plan will be to take to local tuner).
Transmission:
- Flywheel w/ new bolts(changed about 4-5yrs / 10-15k. Looked in good condition and had no need to change.)
- New clutch/pressure plate
- Input/output seals
- Select rod seal
- REVSHIFT trans mounts (95A)
Exhaust?
- Fabspeed catless headers
- Status Gruppe Sec 1&2 (poorly made, going to upgrade to Supersprint)
- Supersprint Sport Muffler
There is a ton more. I may be forgetting some stuff or it's not needed for the issue at hand. So please ask away. I am seriously stuck. She drives beautifully, engine not only sounds strong, but feels amazing. Your ideas or inputs will be greatly appreciated.
Notes:
I have done everything myself. Always made sure to torque-to-spec (At least I believe, keep second guessing myself).
I understand with these firm mounts I would be receiving more feed back from the engine/trans, but I don't think to this extent?
I have ordered a new ICV and Coils.