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Originally Posted by NiMaDiFoB
...in my case the o2 bung on a 5thgen prelude is tilted more upwards. Putting spark plug non foulers would cause the o2 sensor (wire end) to not have enough clearance between the bung and the exhaust heatshield (the huge hunk of heatshield that goes all the way to the back of the car). So I trimmed a portion of that....
Only 1 nonfouler would fit due to clearance. Even if you trim the heatshield away, there's still a deadend behind it.
...but I took it around for about 30miles with no CEL....
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So in the Prelude's case, having only one of two nonfoulers can still avoid throwing a CELL on any type of cat. What about a test pipe if clearance is still an issue?
BTW Do you have a 5TH GEN and can you take pictures of this Homebrew? I'd like to see this "deadend".
EDIT.
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Originally Posted by 619_sdeuce
um... no don't try it with just one non fouler... I did it and it did not relocate the o2 sensor far enough out of the direct path of the exhaust and I threw a CEL right away... changed it back to using both of the non fouler pieces and everything was fine...
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Oh nooo...
