Diagnostic Trouble Codes: P0311 P0312 P0308 P0310 P0300 Local Mercedes dealer's diagnostic included compression test's result was no compression in Cylinders #11 & #12 and they recommended to take heads off for further analysis. I had the left coil bank replaced and no luck. My question is: IS A FAULTY MASS AIR FLOW (MAF) SENSOR CAUSING THE MISFIRE/ERRATIC/ROUGH ENGINE RUNNING SINCE THE MASS AIR FLOW SENSOR MEARURES THE ACTUAL AMOUNT OF AIR ENTERING THE MOTOR AND THE ENGINE CONTROL MODULE (ECM) IS TAKING THE WRONG INFORMATION AND DELIVERING INCORRECT VOLUMES OF FUEL TO CYLINDERS #11 & #12?
2001 S600 Mercedes Misfires on 2001 Mercedes-Benz S600
by eliebenz in Lawrence, MA on June 13, 2010
ANSWER by Visitor on January 18, 2011
Was there a check engine light telling you that the voltage coming from the mass air flow sensor was out of range?
ANSWER by DerMachtigBenz on January 25, 2013
If you actually did receive a message of "no Compression" in 2 adjoining cylinders, I cannot see how replacing parts will address the issue. If you have no compression, it is a signal that you have a leak... Head Gasket, valves burnt, bent or mis-seated, hole in piston, cracks in head or block, all not a lot of fun. However, as the cylinders are adjoining, a blown head gasket (the least expensive of the above) is quite possible. Get the side of the engine clear by removing coil bank, etc, and pull the plugs. Put a compression tester in "free flow" mode (unlocked) and watch how the pressure moves on each cylinder VISUALLY. Dont forget to pull the hot lead on the OTHER coil bank first, or engine could start while testing.
Engine misfires (rough running) and lack of power are commonly caused by ignition coil pack or ignition module faults. Proper diagnoses should isolate the cause and prevent unnecessary replacement ...
The car is very slow to get to speed. does not seem to misfire but lost of power. could the converters be stopped up?