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P0300 Random Misfire figured out.

S

swtnlow1

New member
After weeks of changing parts and scratching my head, I found the cause of my random misfire. I went to change the harmonic balancer and crank sensor, and after removing the balancer, I found that the screws holding the reluctor ring on were loose. I applied Loctite to the screws and retightened them, and like magic, the misfire was gone. Took about 30 minutes. This is a free check, and beats spending money chasing a ghost. I have seen a lot of people struggling with this problem, and I sure hope this helps someone. Wish I had found it sooner.
 


That's interesting for sure I'm surprised it didn't take out the crank sensor. Must not have been very loose?
 
Not sure of the history, but the balancer that I bought to replace it had 4 screws in it, the one on the car only had two. After several weeks of driving, I still have not had any misfire codes come back up.
 


Lol. Yes I am. I've changed and upgraded just about everything.
I might even put back stock balancer just to rule out SFI one.
Next is starting from complete scratch with a new tune. If not that then I'll have to pull engine out
 


so, his misfire at 15psi may have been figured out...but since I don't have bookface I wont know til Sal does another couple tests/visual inspection
 
We were thinking possible crack in head or block on #2. What do you mean by air path. the longest distance through the intake?
 
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