Cleaning MAF's

Spray through the screens onto the wire element in the housing. You are correct in using a MAF or electronics cleaning solution opposed to degreaser or brake cleaner which can leave residue and affect the MAF signal.

 

I was getting CEL 1-4 every 2 days for about 2 weeks. I used electrical contact cleaner and used compressed air (from a compressor not a can) then I adjusted the ohms on each MAF back to 383. I was showing 391 on 1-4 and 389 on 5-8.

Been almost a year/5000 miles later and not one CEL popped back up. I have done this 3 times (just to check) as it does seem to get out of whack but not by much once in a while and they were at 386 and 385. Takes about 15 minutes from start to finish to do both sides.


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Mario
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I did that to my 348 at the time, MAF cleaner,,, I cleaned the screens with it too.
make sure those connectors are mated tight on the MAF that was part of my problem.
no more CELs after doing that as well.

Actually that is what stopped the random CEL syndrome (as I call it) on my 348.....

 

Nice post, Mario.

 

Setting both the MAF's back to 383 ohms works great for a base tune, but that will not get each bank set to 100% optimization. If you have some time try tuning the MAF's using the O2's. It took me a while to set them correctly, but the end result is fantastic. Here is Marco's original thread on the procedure.

http://www.ferrarichat.com/forum/showthread.php?t=202083&highlight=MAF

The before and after effect is amazing.

--Mike

 

setting to 383 will get you on the road...the other adjustment discussed in Marco's thread is a fine tune.

 

As my esteemed colleague Saint Bastage just posted. Set your MAF's to 383ohms and then replace your O2s. Remember to do a complete relearn after that. If you need the procedure just let us know, its easy. I doubt you will have any CEL's after that, if not then do the tune I suggested at you leisure.

Thanks,

Mike

 

I've tried the Marco-way on 2 348('90) and both without result.
Eighter I am doing something horribly wrong, or that's not the way to do it with a euro-car.
As I unplug the lambda and let it idle for a minute or 5, the reading on the sensors starts at 0,003 mV and than slowly dropps to zero.
Turning the maf-screws doesn't do diddly...

Since this is on both sides and both cars, I must be a fool, or atleast thats what my wife always says...
What am i doing wrong? It can't be 4 busted o2 sensors!

Ben

 

Hi Ben,
Are you sure you are following the procedure exactly as he has it in his thread?

http://www.ferrarichat.com/forum/showthread.php?t=202083&highlight=MAF

It took me a while but my readings worked almost exactly as in his post. You should get a changed reading no matter what when adjusting the MAF screw as it will change the exhaust gas and the O2's will change voltage output. You do have to wait between each very small change to the MAF and wait for things to settle. Your meter is set to mV (milliVolts) correct? Oh, and the car must be completely warmed up. I did a relearn and then I let mine idle and go to closed loop before doing this. What are you currently reading in ohms at the MAF's? Try PMing Marco and ask him what he thinks.

--Mike