2007 M5 - start the car for the first time of the day, runs okay for 5 seconds, then limp mode and misfire. Turn vehicle off, turn back on, limp mode gone and no misfires.
Reading with code reader tells a story of ten misfires or sometimes nine misfires plus a random misfire code. If I clear this code and drive after that initial cold start I won't see it again but sometimes the car will randomly misfire for a couple seconds while driving, just long enough to set it back to limp, I pull over, turn car off, turn back on and I can continue driving for 150 miles or so before it even thinks of doing this again.
Car has new upstream o2 sensors, new plugs, new coils, new injectors on bank 1 (Driver side of car, someone correct me if this isn't bank 1), new fuel pump, new fuel filter assembly, and also new rod bearings. I have also cleaned MAF
After doing rod bearings I did the vanos bleeding procedure in ista. Ista showed I have some vanos values that are lower than normal range.
I am tempted to change out MAFs next but want to see if anybody has any ideas. Could this be the VANOS solenoids? It seems strange that all ten cylinders would briefly misfire, I am planning on changing out injectors on bank 2 but surely I would see misfires correlating to bank 2 rather than both banks.
Also is there a way I could confirm fuel pressure at the rail to rule out an initial fueling problem? I can't find a schrader valve on the rail.
Reading with code reader tells a story of ten misfires or sometimes nine misfires plus a random misfire code. If I clear this code and drive after that initial cold start I won't see it again but sometimes the car will randomly misfire for a couple seconds while driving, just long enough to set it back to limp, I pull over, turn car off, turn back on and I can continue driving for 150 miles or so before it even thinks of doing this again.
Car has new upstream o2 sensors, new plugs, new coils, new injectors on bank 1 (Driver side of car, someone correct me if this isn't bank 1), new fuel pump, new fuel filter assembly, and also new rod bearings. I have also cleaned MAF
After doing rod bearings I did the vanos bleeding procedure in ista. Ista showed I have some vanos values that are lower than normal range.
I am tempted to change out MAFs next but want to see if anybody has any ideas. Could this be the VANOS solenoids? It seems strange that all ten cylinders would briefly misfire, I am planning on changing out injectors on bank 2 but surely I would see misfires correlating to bank 2 rather than both banks.
Also is there a way I could confirm fuel pressure at the rail to rule out an initial fueling problem? I can't find a schrader valve on the rail.
