IPD plenum still puts CEL on HELP! - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Stunin_Stud · 11-28-2010, 10:46 AM

I disconnected the plug to the MAF and turned the car on and the car ran fine. I plugged it in and it ran fine again. Basically no change with it plugged in or out.

what does open circuit or short circuit to ground mean? how do I know its grounded or open?

Could this be a problem with the Intake or filter?

thanks guys

extanker · 11-28-2010, 11:19 AM

maybe go to a shop that has the proper test equiptment. the code does seem to point to a bad MAF sensor buti would do more testing and that requires pro books,meters,scan tools etc

Stunin_Stud · 11-28-2010, 12:37 PM

I just disconnected and reconnected the battery, unplugged and plugged the MAF. then drove the car 50 miles no CEL. then stopped for gas and turned it off and when I turned it on it came on immediately. It seems like when i Reset everything i can drive it immediately 50-80 miles but the next time I turn it off and on it comes on. What does this mean?

Im not sure if I should take it to a shop or dealer. Im worried that dealer will make me buy an OEM airbox ( since i broke mine taking it out) on top of another MAF.

Topless · 11-28-2010, 01:27 PM

Yep. Sounds like a completely fouled or disconnected MAF. Pull it out, give it a good look, clean it if needed, inspect the plug in connections to make sure it is seated properly. Also trace the wire harness to make sure it did not get damaged or pinched during your intake mods. This should be an easy fix if you take your time and follow a process of elimination.

FYI: disconnecting the battery will always turn off the CEL and erase the error codes but it doesn't erase the problem that is causing the codes.

thom4782 · 11-27-2011, 05:56 PM

Some monitoring systems don't carry out tests until the car has gone through a number of cycles - starting, etc. - after you clear the codes and lights. Then after the right number of cycles, the system starts testing again and the CEL will pop back on if the problem wasn't fixed. It's not clear - at least to me - what these cycles actually are, but that's why it seems so arbitrary when the CEL comes back on. Good luck in finding the root cause of the problem.

Johnny Danger · 11-28-2011, 04:28 AM

What source did you purchase the sensor from ?