That will make it much harder to keep the performance parts you currently have as most performance cams are not emissions friendly to begin with. It is also likely to be the reason it does not run correctly. The factory ECM is designed to match the camshaft and engine as it was in stock form. Change the cam and now the ECM fuel tables are all wrong. That is why most folks strip the computers out or buy a custom aftermarket unit that can be tuned to match the new parts. Those are not real options in a state that does tailpipe testing like AZ does as removing the factory ECM falls under the tampering section of the inspection and is an automatic fail.
However, you might want to check the routing of the wiring harness the knock sensor wire is in. If it gets routed near the plug wires (or the wires are just laying all over and not in a plug wire loom) you can get a code 43 due to ignition voltage inducing a voltage in the knock sensor wiring.
Even eliminating the code will probably not let it pass testing because they do actual tailpipe testing. Does the truck have all of the OEM pieces on it like the converter, air pump and the rest? If any of the factory smog gear is gone, that is also a fail.
Tuesday, March 27th, 2018 AT 7:11 AM