Hi,

I suddenly got misfires on all cylinders - quite a bummer. I suspect faulty MAF sensor as i was stupid enough to clean my k&n filter and spray a bit of WD40 on it - but looking at real time data it seems to report something reasonable - value of 5-7 at idle, stepping on gas to 2K-3K rpms it goes to 70-80. Is it in right ballpark or too low?

I naturally removed k&n filter now and washed MAF sensor completely, engine ran a bit better after that but still showed CELs. It also sounds quite diferent and still misfres I think. So I want to try to assess possible damage before going to a dealer.

I know on 996 cars typical test was to disconnect MAF sensor completely and it should result in proper operation below 4K rpm. Is it same for 997 cars? I had quite bad misfires and loss of torque below 4K but when I drove home 4K-5K rpm range was sort of OK. not sure what got broken there, just want to confirm how to check if it is MAF sensor to eliminate this cause.

Regards, Paul

 

that was dumb try maf cleaner on it.

 

Hi there

You can disconnect the MAF in the 997 no problem and it will run a baseline map, you can drive the car just as normal, so give it a try.