Hey everyone, I have a quick question. The other day I put a K&N cone filter on my '95 PSE and ever since, when my car gets to 3,500rpm or above the CEL comes on until my rpm's drop below 3,500rpm. Why is this happening? I didn't unplug anything...all I did was a simple filter swap with the intake adapter for the MAF.  My CEL never came on with my K&N drop in filter for my stock airbox, so whats up? Thanks a lot for reading this!   Mark Light '95 PSE ATX

I had the same problem with a Weapon R filter. It seems the engine was recieving to much air and/or the MAF was not reading it fast enough. My engine stalled slightly between 3,000 and 3,500 put every other rpm range it ran better. Or the mixture may be slightly off due to the rush of air and the o2 sensor(s) are picking up the mixture error. YOu might need to find a high performance/high flow MAF sensor to fix the problem. This might have been the case on mine and yours could be different. But if you engine is running slightly different between 3,000 and 3,500 rpms, this is probably what is happening. Hope this helps, Michael Simmons

Did you remove the stock airbox? If so, what did you do with the vacuum lines and the IAT sensor (Intake Air Temperature)? If any on the vacuum lines are exposed to atmosphere, you'll probably get a CEL, if the IAT is not ready the Intake air temp then you could have problems. Enjoy, Bryan probenet.tripod.com >