Advise on MAF conclusions

[m60kaf]

I changed my MAF due to a number of CAT and Fueling errors and laclustre performance - revs slow to rise.

I then read about the AOS and discovered mine had gone and was leaking and relaced it

The car (2.5) was then VERY fast to drive but idled appauling and errored P1127 P1129 and had dangerous hesitation when pulling away from junctions

Put the old MAF back in and noticed perfect idle but the performance has gone again. There are now no errors so presumably my AOS and dirty throttle was causing the very original errors.

I also noticed my Durametric says 35kg/hr at idle with the new MAF and 14kg/hr (I beleive I read 14 is about right)

So is it likely my original MAF is faulty (slow to respond) and the new one isnt the right type and is calibrated wrongly and I need to source the right one and that will give good idle AND performance

Or do I just have to accept with the right MAF a 2.5 aint that much fun - cos with the 'wrong' MAF it was looney at speed

Seems quite a common problem people report they change the MAF then get bad idle

[1schoir]

I changed my MAF due to a number of CAT and Fueling errors and laclustre performance - revs slow to rise.

I then read about the AOS and discovered mine had gone and was leaking and relaced it

The car (2.5) was then VERY fast to drive but idled appauling and errored P1127 P1129 and had dangerous hesitation when pulling away from junctions

Put the old MAF back in and noticed perfect idle but the performance has gone again. There are now no errors so presumably my AOS and dirty throttle was causing the very original errors.

I also noticed my Durametric says 35kg/hr at idle with the new MAF and 14kg/hr (I beleive I read 14 is about right)

So is it likely my original MAF is faulty (slow to respond) and the new one isnt the right type and is calibrated wrongly and I need to source the right one and that will give good idle AND performance

Or do I just have to accept with the right MAF a 2.5 aint that much fun - cos with the 'wrong' MAF it was looney at speed

Seems quite a common problem people report they change the MAF then get bad idle

Early Boxsters (non E-gas) have an idle control valve which, if it is faulty or all gummed up, can produce some of the symptoms that you have described.

Take a look at this thread and the posts by "Stefan", it may solve your problems, or at least help you eliminate one of the possible causes:

http://www.renntech.org/forums/index.php?s...ic=17313&hl

With respect to the MAF, if you got the later style MAF, it will not function properly in your early Boxster unless you have the DME reprogrammed. On the plus side, the design of the later style MAF makes it less prone to fouling.

Regards, Maurice.

[Brad Roberts]

As far as I can tell, the 986 606 125 01 is only for EGAS cars and doesn't work properly in the cable cars. I have also ran 10-15 of these in cars without any special programming, they run just fine and pass smog in CA.

B

What is the part number on the MAF in the car currently? I have people calling me all the time trying to use the VW/Audi Mafs.. and they do not work.

B

[m60kaf]

As far as I can tell, the 986 606 125 01 is only for EGAS cars and doesn't work properly in the cable cars. I have also ran 10-15 of these in cars without any special programming, they run just fine and pass smog in CA.

B

What is the part number on the MAF in the car currently? I have people calling me all the time trying to use the VW/Audi Mafs.. and they do not work.

B

There isnt actually a part number on the new sensor - though I did notice that on the new one there is like some kind of bead thermister (blue) in the top air path that isnt on the old one.

Do you think my -what i consider- to be poor performance and slow responce on my original MAF sounds like failure or just cos its the right one

I have to confess I did get it off ebay :*)

[Brad Roberts]

This is where the part number is located. I sell/sold MAFS on eBay for a long time, so we are not ALL bad :)

B

[m60kaf]

This is where the part number is located. I sell/sold MAFS on eBay for a long time, so we are not ALL bad :)

B

Hmmm nothing on my new one - suspect I've been sold a dud

Is my experience of the poor performance - revs rise pretty slowly - a symptom of a failing MAF?

[Brad Roberts]

Yes. Unplug it.. like someone mentioned above I think.. it will actually run better than what you have now!

The 123 00 runs about $175 now.

B