GH Tune now P0302

[Chronicle33]

I got my Gearhead AO tune two days ago and now I’m getting a P0 302 code. Anyone else has this issue?


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[Texas Marauder]

P0302 is a misfire on cylinder 2. Not caused by the tune itself.

 

[kryptto]

Did you update parts? Replace plugs maybe a bad plug replaced? Maybe ignition coils? Other than loading a tune what else have you done?

 

[Majestic]

Or possibly didn't get a coil seated properly? I've had that happen.

 

[CraxyMitch]

It's likely your plugs.

 

[SHO-moco]

Is this misfire always there or only occasionally like on cold startups? If i am not mistaken cold start misfires are common enough on these cars that the onboard computer has an offset for it, but dont hold me to that.

 

[MGMSHO]

It's likely your plugs.

I had this same issue, I had to go through a PIA way of getting all the parts since I live in Commifornia and I bought the wrong plugs and this happened. I finally bought the right plugs but just haven’t installed it yet since I have smog check with year

 

[SM105K]

Swap coils and see if the misfire moves to another cylinder.

 

[mattr66usa]

Was the plug gap tightened up when you did the tune?

 

[TheRedBeardedFury]

I would swap coil with cylinder 1 or 2 and see if miss follows. If it does you just need a new coil. If miss doesn't move, I would pull the plug and check for cracks, saturation, and gap. Did you install the one step colder plugs with the tune? The miss shouldn't have anything to do with the tune itself.