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Old 04-15-2019, 02:43 PM   #1
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Error codes-too rich

I bought my '04 M3 almost a year ago and ever since I, and the shop I use have been chasing down error codes. Fortunately the car is becoming more reliable but the engine light continues to come on but with fewer codes coming up.

The car has headers but no catalytic converters so it runs rich at start up. All codes now seem to be relegated to cylinders 4-6

We have pretty thoroughly checked for vacuum leaks and we are confident that is not the problem. In March I was getting errors on fuel system bank 2 and Lambda bank 2. These have stopped, a few days ago I got a MAS "A" circuit range. That day the car was surging at idle, something it has not done before. The MAS was replaced prior to this occurrence. The other codes were O2 sensor was slow to respond and pending codes were the car was running to rich, conversely it also returned a "too lean" code.

Today I took a freeze frame, the information was generated from a too rich condition. The information as follows:
Load value 51%, Coolant temp 178, RPM 3110, Speed 78, Ignition timing advance #1 Cyl 29%, Air flow rate from MAF 48 g/s. Absolute throttle 8%

I admit I'm not familiar with these values so any help would be greatly appreciated. Also, my gas mileage is around 14 which sound very low even for an M3.

Please give me any feedback you can.

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Old 04-15-2019, 02:47 PM   #2
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Read this and post logs. Only way to see whats going on

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Old 04-15-2019, 02:49 PM   #3
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Also read thru this

Cold weather misfires and CEL, common issues $50 fix!

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