So I have rebuilt my engine, stripped down to the block, re-honed, new rings, mains, heads, cam, etc. After and nice gently run in period and lots of babying the codes are back. Same two codes, only when the revs reach about 2700 (just over 70mph).
I don't know what to try next? Does a Hawkeye or Blackbox give more information to what might be wrong other than just the codes.
Anyone else have any suggestions as to what might cause this.
Help me please its driving me insane.
2003 SE7 135K miles - Rebuilt engine with RPI stage 3 heads piper torquemax cam. Ceramic coated manifolds and Magnaflow exhaust.