Help--P0307
Thread Starter
Pro
Joined: Aug 2003
Posts: 581
Likes: 110
From: Louisville
Help--P0307
So I finally got my car back after the builder/tuner blew up #7 some months ago. I have it back now and after about 500 miles I'm getting the P0307. This started after installing one of the numerous tune changes the builder has sent me to clear up a transmission issues...now this. My 03 has a forged bottom end, mild BTR SC cam, long tube headers, built transmission, A&A SC w/3.6 pulley, Deko 80lb injectors, and A&A fuel system.
I changed the #7 coil but I'm still getting the code. I didn't think it was the coil after 500 miles but wanted to check. With this being such a fresh build is it possible that something is wrong internally? I added my current tune in case i'm just missing something in the tune. Thanks
I changed the #7 coil but I'm still getting the code. I didn't think it was the coil after 500 miles but wanted to check. With this being such a fresh build is it possible that something is wrong internally? I added my current tune in case i'm just missing something in the tune. Thanks
Pro
Joined: Oct 2020
Posts: 529
Likes: 197
From: Columbus, MS
Usual isolation routine-- change the following parts from cylinder 7 and a known-good cylinder
1. Coil (sounds like you did that already)
2. Wire
3. Spark plug (take a look at it when you remove it, look for anything unusual)
4. Fuel injector
Swap these parts one at a time and see if the miss moves to a different cylinder. If it moves you know that the last part you moved was the culprit and you can replace it and hopefully be good to go. If none of those parts move the miss you can do a compression test to see what you get for that cylinder. You can also horoscope that cylinder by sticking an inspection camera down the spark plug hole and look for anything unusual about the piston head and cylinder wall.
1. Coil (sounds like you did that already)
2. Wire
3. Spark plug (take a look at it when you remove it, look for anything unusual)
4. Fuel injector
Swap these parts one at a time and see if the miss moves to a different cylinder. If it moves you know that the last part you moved was the culprit and you can replace it and hopefully be good to go. If none of those parts move the miss you can do a compression test to see what you get for that cylinder. You can also horoscope that cylinder by sticking an inspection camera down the spark plug hole and look for anything unusual about the piston head and cylinder wall.
Drifting
Joined: Apr 2007
Posts: 1,517
Likes: 159
From: Lafayette Louisiana
Plug looks wet. I would start off with new plug and swap wires with another cylinder. If problem does not move then swap coils with another cylinder. Hopefully one of those will be the problem.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer