What Happened CEL?!?!

[1BadTundra]

I'm cruising today and hit what we call the Bonus lane, (small extra lane for exiting & merging) No one was in it so it was power lane. Long story short, car hit 115mph, it pulled back like the governor kicked on, and threw a flashing CEL for about 10 seconds, and the cluster started flashing "forward collision off, lane assist off, etc).. All this while in "My Mode". What happened, I thought I had a lot more room before that would kick on. I have a JB4 installed, if that matters. Thoughts?

 

[shbox]

I would say having the JB4 makes it harder to diagnose, since that makes things a bit non-standard, but a scan is in order to see what is going on.

 

[1BadTundra]

I scanned for a CEL, but no codes popped up.

 

[1BadTundra]

Well, went to start it back up and had the CEL. Scanned it again and found a P0306... Looks like I need new plugs, most likely due to the JB4. Number 6 misfire.

 

[Matt27]

Well, went to start it back up and had the CEL. Scanned it again and found a P0306... Looks like I need new plugs, most likely due to the JB4. Number 6 misfire.

Damn. How many miles since installing the JB4?

 

[1BadTundra]

Damn. How many miles since installing the JB4?

About 400 miles since install. 4200 miles on the car

 

[Throat Yogurt]

Did you replace the plugs when you installed the JB4? I thought that was a required part of the install.

 

[1BadTundra]

Did you replace the plugs when you installed the JB4? I thought that was a required part of the install.

I didn't.. I bought the unit from another member here. After reading I see it is recommended to get new plugs.

 

[1BadTundra]

UPDATE: My new plugs arrived yesterday, installed today. She seems to idle smoother, and she friggin rips when I stand on it. Love it!

 

[dstewart51]

Classic misfire, you have to check the stored pending codes, if you cause it to miss long enough it will set a hard code and a more difninitve ID on which cyl is misfiring. The key is not so much new plugs, but plug gap. It has to be reduced some from the factory .032"-.034" down to .024" - .026". The extra boost is pushing the ignistion system to the limit and reducing the plug gap will help.