I have posted this on another Fiat 500 forum, but it hasn't received much attention and I am hoping there is someone here that can help.
I have a 2012 500 NA that I purchased this fall with 82K. Since the cold weather has set in, I have been receiving terrible cold starts – misfiring, idle all over the place and eventual stalling. The ECU has thrown a couple different misfire codes, the most common being PO302 cylinder 2 misfire and occasionally a PO300 multiple cylinder misfire code.
Once the car is up and running after the initial cold start issue, all symptoms disappear and the car drives beautifully. I’ve let it sit a few hours and the startup is normal. Sitting longer than 8 hours in this weather tends to bring back the cold start issues. It is hit or miss if I get the cold start after sitting outside at work for 7-9 hours. This is not a primary vehicle, so I have been driving it once a week since these conditions have started occurring.
The previous owner had the following services performed within the past 2,000 miles, a coil pack was replaced, 4 new spark plugs, engine oil flush and change. I noticed the oil change receipt indicated that they put 0W40 synthetic oil and the cap indicates 5W30 should be used.
Is there any chance the oil weight would be affecting the cold start? I know the multiair system is driven by the oil pressure.
My thought is that it is somehow related to the ECU programing that runs the engine rich at cold start to get the engine up to temp. If it were a bad plug/coil etc, I would anticipate having issues beyond the cold start - specifically at WOT.
I know there's a TSB related to cold start issues, but when I read though it the symptoms are not the same.
The nearest Fiat dealer is 150 miles away and I usually avoid dealerships when it comes to maintenance and repairs.
I have a 2012 500 NA that I purchased this fall with 82K. Since the cold weather has set in, I have been receiving terrible cold starts – misfiring, idle all over the place and eventual stalling. The ECU has thrown a couple different misfire codes, the most common being PO302 cylinder 2 misfire and occasionally a PO300 multiple cylinder misfire code.
Once the car is up and running after the initial cold start issue, all symptoms disappear and the car drives beautifully. I’ve let it sit a few hours and the startup is normal. Sitting longer than 8 hours in this weather tends to bring back the cold start issues. It is hit or miss if I get the cold start after sitting outside at work for 7-9 hours. This is not a primary vehicle, so I have been driving it once a week since these conditions have started occurring.
The previous owner had the following services performed within the past 2,000 miles, a coil pack was replaced, 4 new spark plugs, engine oil flush and change. I noticed the oil change receipt indicated that they put 0W40 synthetic oil and the cap indicates 5W30 should be used.
Is there any chance the oil weight would be affecting the cold start? I know the multiair system is driven by the oil pressure.
My thought is that it is somehow related to the ECU programing that runs the engine rich at cold start to get the engine up to temp. If it were a bad plug/coil etc, I would anticipate having issues beyond the cold start - specifically at WOT.
I know there's a TSB related to cold start issues, but when I read though it the symptoms are not the same.
The nearest Fiat dealer is 150 miles away and I usually avoid dealerships when it comes to maintenance and repairs.
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