Runs like crap with MAF connected

[Deadeye]

Originally Posted by The Radium King

what tune are you running?

Not sure how the shop tuned the ecu after the transplant. I purchased the car this way.

I used the larger maf tube from the 987 intake and that is probably the cause. Car is going to a shop for a dyno tune today.

Why does it run very well with the maf disconnected? Does the ecu default to a baseline? Is the primary purpose of the maf to optimize fuel mix for mileage and emissions?

[johnsjmc]

Originally Posted by Deadeye

Not sure how the shop tuned the ecu after the transplant. I purchased the car this way.

I used the larger maf tube from the 987 intake and that is probably the cause. Car is going to a shop for a dyno tune today.

Why does it run very well with the maf disconnected? Does the ecu default to a baseline? Is the primary purpose of the maf to optimize fuel mix for mileage and emissions?

Yes . Without the maf it defaults to open loop/limp home mode. Some have said the open loop programming is pretty good ,but I suspect it will run overly rich .

[itsnotanova]

I have the 3.4 tune on mine. I think I heard that the 3.4 tune likes the maf being closer to the throttle body that the 987 airbox gives it.