Quote:
Originally Posted by RZNT4R
One of your live data pictures showing SHRTFT at +20% while the other is at -9%, if you had a bank 1 lean, that means fuel trims were maxed and the AF sensor was still asking for more fuel. there is a difference between these two states... With that said, it's counter intuitive because it often smells like unburnt fuel, but a misfire makes a bank go lean as seen from the AF sensor, because it throws a lot more air into the exhaust than it does fuel.
OR, Cylinder 3 may have a condition that makes it miss before the others when the mixture goes very lean. Welcome to the fun non-ignition misfires! It would be silly not to check fuel pressure as the problem surfaced post fill-up after the car sat for a long time (assuming since it was a wreck), there may have been deposits in the fuel thank that got kicked up and clogged the system. Checking the fuel pressure for the high side is easy enough with a scan tool, for the low side, well, you'll need a fuel pressure gauge.
If that checks out, check compression. That checks out too? Move the injectors to other cylinders.
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The fuel pressure is around 500-700 psi on idle for the high pressure line. I would find it very interesting if there was low pressure but only cylinder 3 had the misfire issue. Also, all injectors, coils and plugs have been changed/swapped places.
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