My car
seems to be misfiring. Since being turboed, It's only been driven maybe 4 blocks & spent maybe 12 hours total idling in my driveway. I wasn't sure if I should post this up over in the TT forum or here in FI since I'm running Megasquirt. Guess I'll toss it out for anyone that might have some insight on something I'm missing, or a wild hair of what else I might try.
The car:
Stock 533i motor w/turbo, MS2 extra, e34 harness, & wasted spark
Situation:
I let it sit for a few days without starting it & now "out of the blue" it seems to have a missfire on one of the cylinders (or all of them?). After things warm up, it's still present but not quite as obvious until the engine is revved up. Then it sounds like Subaru or something.
Troubleshooting done: (in no particular order)
The wbo2 had come loose & it was running very rich so I pulled all plugs to put some fire to them and wire brush/clean.
Bought 1 new plug & swapped it to each cyl individually to trace the problem.
Checked coil to plug firing order.
Checked resistance on all 'new' plug wires.
Swapped in new plugs for the ones that have maybe 12 hours run time.
Checked for spark on every wire. Running MSD coils & it was huge!
Checked timing in MS.
Verified all injector connectors were firing w/noid light. (brand new injectors)
Tried separating the sparkplug wires (that I ziptied together) thinking the may have been some crossfire going on.
Created a new map from scratch in Tunerstudio.
I have yet to do a compression test to see if my worst fear is true, in which case I'll be pulling the head for a rebuild.
Any other ideas of what I might check?
![Brickwall :brickwall:](./images/smilies/brickwall.gif)