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Originally Posted by bcrdukes
I am not doubting your mechanical ability, but were the spark plugs gapped properly and torqued down correctly?
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Yes, including new plugs that were gapped to correct standard.
Quote:
Originally Posted by GabAlmighty
Plug wires grounding/shorting out somewhere? Faulty ignition module? ECU could be fried (this one throws you for a loop)?
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I have a suspicion it could be electrical or the ECU, the car has no noticeable stumbling or any noticeable feel to the misfire. A shop inspected it as much as they could mechanically and didn't find anything immediate.
Quote:
Originally Posted by Peturbo
Don't think you can use this data to diagnosis a p0300 (random misfire). It is more for a technician to know how to drive the vehicle to hopefully reproduce misfire.
Looking through the data only thing I notice is when youre in moderate load with pretty high RPMs, your EVAP is purging; with no change to fuel short term trim.
Usually lowers during purge to compensate for this extra incoming fuel. (even see it adding more fuel in the "during" frame)
Not familiar with how Fiats program their EVAP systems so cant say for sure this is an issue.
But hard to blame a random misfire on EVAP purging. Take this all with a grain of salt.
Have you checked with Fiat dealers? any service bulletins with software update for this issue?
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My next step will be the dealership I guess, I held out for as long as I could.
The vehicle is now out of warranty and at 30,000 KMs ago the engine and turbo were replaced under warranty with a few reflashes done during the repair process by the previous owner. I'll go and see if they have any clue whats going on, hopefully it wont cost an arm and a leg.