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Mass or volume airflow a circuit low6/26/2023 ![]() Thus the problem may lie with the sensors. I did a bit of research and the guidelines for misfires in which there are oxygen sensor fault codes ahead of the misfire fault codes first correct this fault and road test the vehicle. IIRC the old MAF may not be available and the newer MAF requires a DME firmware update which costs on top of the MAF. But given the cost of the MAF i'd not replace one just yet. It is not 100% conclusive as it is a crude/shade tree mechanic test. This strongly suggests the MAF is not the cause of the symptoms. BUT- I do have that persistent P0102 code that always comes on almost immediatlely (usually pending for a long time) suspect seeing O2 sensor codes due to the misfires and resultant what ever happens to the gases from the miss-fire. Could be weak coils as things seem to be worse when engine hot. I don't think MAF as I can move the misfires with the coils. 3 pending codes P0102 (always present) P0157 and a new one P0151 Oxygen Circuit No Activity Detected (Bank 2 Sensor 1) let the car sit for a few hrs and cleared codes drove home, car ran great no CEl, no misfires, no hunting at idle. after 35 milers of driving came to a stop and blinking CEl & hunting was back. car was running great made several stops restarts etc with no issues ![]() cleared all codes and went for 35 mile ride neat morning. restarted car and hunting was gone and idle was smooth. changed it with an old one I had here but was functioning properly when last used. Put coils back into original configuration and miss- fires moved back to bank 2- I moved some of those to the point I thought I had isolated 1 specific bad coil. Flip coils from bank 2 to bank 1 and miss-fires moved to bank 1 but no O2 sensor codes Multiple misfires on bank2 along with codes indicating low voltage bank2 both sensors P0157, P0151 Unscrewed oil cap, nothing else, idled worse Ran the tank almost dry, refilled with fresh gas- no changeĭisconnected MAF- nothing else, no change You have to disconnect the MAF, clear DTCs to reset all fuel trims to their defaults, then fire up the engine and give it some time to learn without the benefit of the MAF.Īlso, I came into this late - been dealing with family matters night and day these last 4 days or so and have 3 or 4 more days to go before things (I hope!) settle back down - so I do not know what you've done or considered but have you considered, is it a possibility, there's bad gas in the tank?Įdited 1 time(s). You have to be very careful and try one thing at a time. The engine is shut off, the codes read, and the owner is left scratching his head with what he thinks is a complete picture albeit a puzzling picture but it is an incomplete picture.īefore you replace the MAF, have you tried running the engine without the MAF? I just read some older posts and I read where you disconnected the MAF and then removed the oil tube filler cap. The DME doesn't go into some kind of research mode, let's see where this leads us mode, it just flags misfires and that's that.Īlso, more cylinders might misfire but when the CEL comes on that's that too. Now the thing is the phase may not be that steady or regular but when the misfires occur that's all she wrote. The failure of the MAF is intermittent and gets in phase/time with the engine and the misfires occur. I'm not sure why this is but I can guess. ![]() There have been a few - not many - cases of misfires arising from a bad MAF. So let me see if I can expand upon this a bit and provide some help. P1319 Manufacturer Controlled Ignition System Or Misfire P1315 Manufacturer Controlled Ignition System Or Misfire P1314 Manufacturer Controlled Ignition System Or Misfire P0102 Mass Or Volume Air Flow A Circuit Low Input Changing out 1 coil pack made matters worse? I am so confused. started car and within a minute or so CEL flashing with following codes: SO originally all codes were on bank 2- switch coil packs from 1 side to the other now issues are on bank 1.
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