GT40 heads in CA
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New User
Joined: Apr 2015
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From: Nevada City, CA
GT40 heads in CA
Has anyone done the GT40 head swap on their BKO and been able to avoid the CEL code 311 for the secondary air system? I had my engine rebuilt with a set of GT40 heads, lightning lower intake and explorer upper. I have to cap off the crossover tubes that connected to the back of the heads because the GT40's don't have the holes for them. Everything has been hooked up and drive great for about 7k miles. i decided to check for codes because smog is due soon and i pulled the code 311, and i'm assuming that it's because it's not letting the air back in. If anyone has any suggestions, it would be greatly appreciated.
Thanks,
Thanks,
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
During the KOER tests the PCM looks for air entering the exhaust. With the thermactor ports closed or missing components you will fail this test every single time. It will not trigger a Check Engine Light.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
For those without a scorecard the same issue has been posted and replied to here: code 311 after GT40's - FSB Forums
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New User
Joined: Apr 2015
Posts: 3
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From: Nevada City, CA
I have posted this question on several sites. I'm hoping someone in CA has done this and found a way around it. I really don't want to pull the engine again. it's running 100 times better than it was with the stock crap on it
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