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S38B38 MAF Outlet Mesh

2K views 15 replies 5 participants last post by  Eero H 
#1 ·
I noticed that the mesh on the outlet of the MAF on my car was looking a little worse for wear.

Doing a little research, P/No.13 62 1 316 910 is fitted to the inlet on the 3.8 and both the inlet and outlet on the 3.6. The outlet on the 3.8 is P/No. 13 62 1 318 308 which is a smaller diameter than the inlet and of course is NLA.... :frown.

Anyone have an idea of an alternative?
 

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#4 ·
You are correct, new MAF's are still available, just that there isn't anything wrong with the unit fitted to the car and working on the principle "if it ain't broke don't fix it" I had not considered replacing a $12.00 part with a $950.00 item.
 
#8 ·
Hmm... I hear you. Mine has 130k miles (what is that, about 200k km?) Is there a practical way to test the function? I was told they can be adjusted by the covered screw, and then testing by checking exhaust gas? Is that the only way to test?

I would expect there should be an electronic way to test something like this, eh? I contacted one place about a "rebuild" but they never responded...
 
#9 ·
on the e39 side, we unlock the obc and you can measure fuel flow, based off the mafs readings, in L/H. below120l/h usually means mafs are not up to their best.

That same test is available on the e34 obc, but i'm not sure what the standard range is.
 
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#10 ·
JDS Porsche in UK can rebuilld, test and adjust 3.6MAF. I heard soon they can do 3.8 also.

Testing is not so easy, need measured air flow through MAF, measure resistance and then need to know what it should be.

"The MAF is basically a hot wire suspended in air.
Revving engine ---> more air flows through ---> hot wire cools down ---> change in resistance ---> signal sending to ECU to inject more fuel to match with more air.
This is a very difficult device to test properly."

Intake temp sensor is also very important, cost ~30€.
 
#11 ·
Sounds like black magic....

Thanks for the info about the place in UK, will keep that in mind. Interestingly, when I was searching the part number, it looks like maybe the same MAF is used in Porsche 928? The part numbers are the same for both cars, which seems more than coincidence.

I would obviously like to locate a place closer to me, but still looking. New prices look like they have jumped to $2k range now, so that is really not an option now.
 
#13 ·
The part number for the Porshe 928 is not exactly the same. Please see attached from Bosch. As you will see the basic part is fitted to the Porsche 928 & Mercedez-Benz 500E.
I've been in touch with John and the MAF recalibration service at JDS Porsche should be available soon.
 

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#14 ·
3.8 MAF Rebuild

I sent John at JDS the correct round multi-pin connector for the 3.8 MAF so he could set his flow jig up to test and calibrate the MAF.

I just got an email from him saying that he is awaiting some feedback from a german company who has a 3.8 on a dyno there to compare results from 2 modified MAFS. Shouldn't be long before we can get these rebuilt to as new.
 
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