Low RPM/Cold stutter - 986 Forum - The Community for Porsche Boxster & Cayman Owners

mikstew · 06-12-2011, 09:45 AM

With my recent experience, I would also suspect the MAF, but would expect a CEL.

Note that you need to put some time/kms on the car for it to throw the CEL code, which is why your scan may have turned out negative.

sparker · 06-13-2011, 03:10 PM

Hmm, cleaned the MAF - problem still there.... Strangely, it does seem a fraction better though, so might just be the computer re-learning?

My next thought is some sort of leak in the inlet track, I suspect the J tube to the air/oil seperator.

Will also measure the voltage at the battery both before and after starting the car in these cold mornings to see if a combination of the battery and the under drive pulley are struggling at low rpm in the cold.

Regards,
Sam

jhandy · 06-13-2011, 05:26 PM

unplug your battery and let it sit, then re attach the battery. The goal is to reset your computer so that it can relearn.

You will know when it is learning, when you first start it, at idle it will RPM hunt a little. Drive it hard for a little. See if that helps.

sparker · 06-13-2011, 05:46 PM

Yeah might give that a shot - has been a while since I 'reset' the computer.

Thanks,
Sam

sparker · 06-15-2011, 03:44 PM

Ok - reset the computer, still no good. Also measured the battery this morning before starting the car (with it sitting stationary for two days) and the battery showed 11.9v (at a chilly 3.5 degrees celsius!) Once the car was started, I measured again and it read a nice 14.48-14.50 volts. Lovely!

Unfortunately though, problem was still there.... Might yank the throttle out for another clean to see if that helps at all, although I dont think that explains the backfire....

Sam

coolbreeze551 · 06-16-2011, 04:56 PM

I am having the same issue. I even went as far as to replace the maf and it is still backfiring. I havent unplugged the battery to let it "reset" yet but I am still having the same issues even after the new Maf. Keep me posted if you find a fix.

sparker · 06-16-2011, 04:59 PM

I tried re-setting the computer again last night, this time I had the battery disconnected for a good hour (last time it was only 2 mins).

This did seem to fix the problem, car drove beatifully last night no backfire and much much more power.

This morning though, the problem was still half there, not as bad as other days but it was still lacking power and stuttering down low.

Problem still not solved....
Sam