Quote:
Originally Posted by upallnight
You have misfires with injectors shut off. The computer is not sending a signal to the injectors to open so that cylinder is basically dead. Turning the engine off and back on just reset the misfire counters and the computer is sending a signal to those injectors to open again, until x amount of misfires has occurred and the computer will shut off the injectos again.
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I get it. The "Ignition off then on immediately solves the problem" symptom means nothing. I understood this after your original replies. In hindsight, I should've gone back and edited my posts to remove this.
Quote:
Originally Posted by upallnight
In a computer controlled engine, a misfire is defined as a cylinder not producing the same amount of power as the other cylinders. The computer can determine this by the rpm of the engine once the cylinder is on the power stroke. In the old day, misfires were limited to spark plugs, ignition coil, spark plug cables and the distributor cap and rotor. I think you have something else wrong and not just a lean condition.
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I agree. After reviewing the fuel trim data again, it does not seem to be all that bad. Sure, I could work to get the long term value on Bank 1 closer to 0, but +5.5 should be just fine and not throw any codes.
Through an unfortunate turn of events last night, I may have stumbled upon the cause of this: Leaving work, I get into my X5 and turn the key. Dash lights up momentarily then all goes dark. No click of the starter, no dash lights, no 12V, nothing except a faint airbag light and the light from the LED on my cigarette plug phone charger. Key won't even unlock doors remotely. After initially fearing the worse, I calm down enough to think through it and come to the conclusion that I either blew a main fusible link or there is something wrong with the battery connections. I've seen this behavior before on severely corroded battery terminals. Worst case I had a catastrophic failure with my battery. I get the last employee left at work to give me a jump through the engine compartment so I can open the rear hatch. Upon inspecting the fusible links I notice that the positive cable is loose. Tighten it down and, voila, all is good. I purchased this car in December and, although I have disconnected the negative cable to replace the stereo, I never had a need to check the positive. On my way home I begin to wonder if this could be the cause of the misfire so I let it idle in my garage for almost 2 hours. No SES. Cold start this morning and idle for 20 min. No SES. Its only been 1 day, but the misfire's came on quicker than this before. I will monitor for a week and post back on this site if this fixes it.
02-01-2017, 02:22 PM
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