dragracer1316

1998 Boxter cranks and idles fine when cold. When you try to drive, the car acts like it won't take fuel spits sputters and backfires through induction system. The car has sat for about six mounts but was doing this before. I have checked the fuel pressure and cleaned the fuel injectors. I have also replaced the air temp. sensor, but nothing has helped. If you have any info. or suggestions please help. Thanks dragracer1316

pl

bad gas?

mytoy986

I think it's the missing "S"

dragracer1316

"S" ?

mytoy986

box S ter

Turboflyer

Have you checked the fuel pressure under load? Also what about the fuel filter. Could be clogged or partially collapsed. Outside of that possibly sticking valves or more complex ignition related ECU problems. Curious to know when you find it.

99firehawk

what air sensor did you replace , the intake air sensor is part of the maf sensor

MikeBat

dragracer1316

GEE THANKS

dragracer1316

The one that is in the intake runner. Will a MAF make the car do this? Thanks Andy

99firehawk

the only sensor in the intake tract is the maf sensor and yes it can casue that. Did you replace the maf sensor, did you replace it with an identical one?

dragracer1316

Thanks for the info. Will replace the MAF with one from Porsche.

99firehawk

be carefull there are 2 maf snesors for your car one requires a new program in the dme to run right

FrankM

you need to diagnose it before throwing parts at it.
find what codes are in the ECM and troubleshoot from there.

its possible the MAF is bad but also possible other things are bad. why throw good money after bad.

Imagine going to a Dr with a tummy ache and without any diagnostic tests you are told you have stomach cancer.

amondc

un plug the maf and see if its any better. the car will go into a default mode and will run fine. I would do that before buying a 500 maf sensor.