P0300 cold start missfire clears up

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09-11-2014, 07:39 AM

Seahag

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P0300 cold start missfire clears up

I reset my computer about 4 weeks ago
And when I started it for a few days it would run rough and clear up.

This morning it did the same thing out of nowhere but it misfires really bad

Lasted for maybe 5 mins. And threw p0300

After that it cleared up and ran awesome (cool out)

It rained a lot last night and was very cool this morning

Is it a coil going out. Or something else ?

09-11-2014, 08:42 AM

tosheto

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Most likely coil going bad. When the car misfires check the codes and hopefully next time it throws a code for a specific cylinder. Then just change that coil pack.

09-11-2014, 04:41 PM

BigLou55

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Don't rule out your engine harness. From the bend near the passenger strut to each individual coil pack are potentially for wire breakage. Something to check.