Quote:
Originally Posted by xxxJohnBoyxxx  A exhaust leak before the O2 would cause the O2 to report a lean condition from the fresh air pulled into the exhaust gas telling the O2 the AFR is too lean which would cause the DME to add additional fuel. Also I believe the DME would report a CEL for adaption values out of range as the DME tries to correct the AFR with adaption. |
Right you are, I'm getting a CEL, P0170 - Fuel Trim Malfunction (Bank 1), and the Long Term Fuel Trim hovers between 18 and 25 percent on the positive side.
Quote:
Originally Posted by xxxJohnBoyxxx Is the intake air temp sender good? Are you positive the up-stream O2 is good with no pinched wiring or anything that would cause it to report bad values? |
Both the MAF and pre-cat O2 sensor has been replaced. By air temp sensor, do you mean MAF?
I'd also thought about blocking off the SAP inlet on the header, but I'm not sure how to go about blocking it for a test. Get a big gasket, drill a couple of holes, and sandwich it between the header tube and check valve, maybe?
Thanks for your internet guess. I've been at this for 9 months now.