Mike Puckett
SCCoA Member
Last summer I swapped out my S-model sc with an MP2 that I got and started having intermittent check engine light issues. I always got EGR codes whenever I checked for codes yet the EGR system seemed to be working fine, valve opened and closed Ok and I tried several of the gray sensor blocks to no avail. I took it apart 3 times to find the problem but came up blank each time. I had no performance or vacuum/boost issues and the car ran great. I swapped the S-model back on during the off season and now the CEL is gone and I get no more codes. Performance is about equal with the S-model being just a tiny bit faster and quicker in the 1/4 mi. So, now I'm curious, why the CEL and EGR codes with the MP2? I'm using the same MP upper intake and 85mm throttle body. Anybody else have this experience or have any ideas?