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Old 12-28-2016, 03:03 PM
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Join Date: Dec 2016
Location: CT
Car: 654Ci
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Default Random Missfire on one bank when cold

Vehicle is 645Ci with the N62 engine. Recently developed a problem when started cold.

The engine idles very rough. Feels like random miss-fires (not like the systematic miss of a fouled plug or failed coil). Check Engine light comes on and codes are "Random Misfire" followed by codes for misfire in cylinders 5 through 8. That is the entire Left Bank.

I pulled the Vanos solenoids cleaned and soaked them. Reinstalled & there is no change. Misses and makes the same codes.

A few details:
- The problem last only a few minutes then clear up as if a switch was thrown.
- Even while missing badly at idle, the car will accelerate and drive smoothly.
- codes are P300, 305, 306, 307, 308


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