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Newbie hoping for 996TT MAF sensor help!

LanternRouge

New member
I'm gonna be cheeky and jump straight in with a plea for some tech help on my first post.

The past 12 months has seen a love hate relationship with my first Porsche.

I finally got to the bottom of all the niggles following 12 months of ownership and back and forth to the garage which finally resulted in the engine being removed for a faulty oil cooler with a leak - ouch!!!

So, for the past 6 months or so the car has performed well on some days and was heavy and didn't boost properly on other days. It was pot luck - a bit like it's owner me thinks!

I drove it away from the garage following an 'engine out' oil cooler replacement a couple of weeks ago and the thing all of a sudden started idling weirdly. It drove well but when in neutral it would rev up to circa 1100 and stay there. Took it back to the garage and the fault codes were weird enough for them to suspect it was the MAF. After a quick swap with second hand MAF from another similar model, my car had never run so good. It was performing like never before and I was confident it was finally sorted and my porsche paranoia over!. However that was short lived!

A new MAF was ordered and the following day it was taken back to get the new part swapped out for my temp loan MAF, same part number as both previous ones - 996.606.124.00. Then I drove away only to find that the idle was back up around the 1,100rpm mark. The car is running better but the idle is all messed up again. I was expecting it to settle but it simply isn't right.

It is going back in next week for another job - but was hoping someone could let me know if this sounds like a common problem when installing a new MAF? - as it didn't have the idle problem prior to the engine out job, should something have been reset maybe?

To add to the bizarreness, my in dash display brightness is now all over the place and has a mind of its own when the seat belt message is showing. Arghhhh![:mad:]

Any help would be gratefully received.

Many thanks
 
Are you using a well known Porsche specialist!?

If they havent fixed after a couple of visits maximum you need to use someone else.

Setting the idle correctly is really basic and done via the computer and tested on a test drive!
 
ORIGINAL: Gordon Attar
Setting the idle correctly is really basic and done via the computer and tested on a test drive!
Not on a 996 Gordon. The idle speed is programmed in the fuelling map, and can't be adjusted with a Porsche tester.

Welcome Gavin!!

It should idle at about 720rpm with the aircon switched off, and will increase a bit when you switch it on. At 1100rpm, I would suspect a vacuum leak. It could be that they haven't reconnected a vacuum line when the engine went back in.
 
Thanks chaps.....

...and Richard, this makes sense, thanks a lot for your time and for the welcome.

I guess the only thing that may spoil that theory was the way it was running when I had the borrowed 2nd hand MAF. It was running soooo well for those couple of days and now with the new one I'm back to high revs?!?!

More to go on this clearly; will post an update following my trip to the garage next wednesday.

 

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