No I would'nt replace the knock sensor check for a vacume leak. I'm sure you pulled off some items when you installed the down pipe......did the down pipe you bought replace the o2 housing too? Clear the codes and drive the car and see if the same codes come back, some od those codes may have been old stored codes.
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1991 Toyota Supra 580rwhp617TQ
11.80@117MPH Under Construction
1992 Honda Prelude 400Hp ??TQ
14.0@ 114MPH Time for Update
2007 Cadilliac Escalade daily
Knowledge Is Power...................
Last edited by FRISBEE; 06-15-2010 at 12:10 AM.
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