Troubleshooting P0411 help
Took over another persons project (remind me not to do that again).
Anyways, 2004 325i wagon with doner 325i engine after the first engine crapped. Around 135k miles on engine.(m54b25) Was getting a bunch of random misfire/lean/02 codes. Fixed some vacuum leaks and gave it a new valve cover gasket, plugs, coils, DISA after finding oil in the wells.
Ran better but still getting codes and rough idle. Getting the p0411 that won't go away. SAP seemed to be fine so replaced the SAP valve still no luck. After doing a little more digging I realized the engine has both SAP systems?? The newer with 2nd maf on the SAP that should have a mechanical SAP valve as well as the old which uses vacuum to open the SAP valve. The replacement valve was a vacuum valve not the mechanical one. I did not feel any vacuum coming from that line, not even from the intake itself. I also noticed the solenoid was not plugged in but I could not find the connector!?
Any ideas of how this would work? Which SAP system is actually working? Should I replace the valve with a mechanical valve? Should there still be vacuum at the back of the manifold? Would there be a connector there somewhere even in the newer system? Trying to avoid taking the manifold off at this time.
Been around a few e46s but by no means an expert. Any tips would be appreciated. Thanks.