Maf problem?? I stumped subaru can I stump you?? :)

waldo320 · Post by **waldo320** » Tue Aug 29, 2006 8:55 pm

Well I got the used maf in yesterday put it in the car and it ran great and then after I drove it for a while it supterd and died. The car will not idol for more than 15 sec the tps iac are all in the stock location still nothing. Next I unplug the maf and the car idols great right were I want it to? So right there it rules out the temp senor right? So right now I do not were to turn other than a brand new maf that I put in my yesterday? Help!

Manarius · Post by **Manarius** » Tue Aug 29, 2006 9:27 pm

Get another MAF. I'm sure someone here on the board has one they're willing to let go cheap.

quicklook · Post by **quicklook** » Wed Aug 30, 2006 12:22 am

did you try to reset computer?

waldo320 · Post by **waldo320** » Wed Aug 30, 2006 2:23 am

Tried reset nothing happend. Also can there be to much air blowing through the maf to break the wires, or what angle the air is comming in the maf at?

Manarius · Post by **Manarius** » Wed Aug 30, 2006 2:55 am

waldo320 wrote:Tried reset nothing happend. Also can there be to much air blowing through the maf to break the wires, or what angle the air is comming in the maf at?

Well, MAF's don't like turbulent air. They can handle pretty high volumes. But, your car is acting just like mine did when the MAF went kaputz.

dzx · Post by **dzx** » Wed Aug 30, 2006 6:11 am

which maf did you put in?

waldo320 · Post by **waldo320** » Wed Aug 30, 2006 2:57 pm

One form a 92 auto NA legacy.

sammydafish · Post by **sammydafish** » Wed Aug 30, 2006 3:12 pm

what year is your car? do you have the JECs (plastic) or hitachi(aluminim) MAF stock? The hitachis are hot wire and seem to break easily (I broke mine) the jecs is a thin film and seems to work much better. you can swap a jecs for a hitachi with wiring changes, but without changing wiring it will know the wrong maf is there and run like poop.

or, your new one could just be bad.... that's not impossable

waldo320 · Post by **waldo320** » Wed Aug 30, 2006 4:12 pm

Im pretty sure that I an jecs black plastic maf with 5 pins and says autoecs on the side of the maf. Could water injection to close to a maf break the maf? My water nozels is down stream of the maf but only by a 4 inches or so. Could that be the probolem it shorted out?

sammydafish · Post by **sammydafish** » Wed Aug 30, 2006 4:40 pm

what year and model is your car?

waldo320 · Post by **waldo320** » Wed Aug 30, 2006 5:16 pm

94 BC NA auto trans

Post by **Legacy777** » Wed Aug 30, 2006 6:28 pm

Get another JECS MAF sensor.

4" should be a fine distance...

waldo320 · Post by **waldo320** » Tue Sep 05, 2006 8:54 pm

Well hate to bring up an old topic but my 3rd maf just took a dump. So that is right that is my third maf, so I put a new coolant temp sensor in no change. So I am going to attach some pics to show you what mods I have to do to maf to make it fit and my current blow through set up. Sugestions PLEASE! When it starts it revs to 3000 then dies right away unplug the maf no more problem?

http://www.putfile.com/pic.php?img=3326792

http://www.putfile.com/pic.php?img=3326791

waldo320 · Post by **waldo320** » Thu Sep 07, 2006 9:49 pm

Seriously what would cause me to blow 3 mafs????

waldo320 · Post by **waldo320** » Wed Sep 13, 2006 10:55 pm

This is were I am at right now. I have not found the problem I do not know were to turn? What fuse conrtols the maf, and would moving the battery to the trunk cause any grounding problems, and how do I know if I have a bad ecu??? Please leave me some suggestions!

sammydafish · Post by **sammydafish** » Thu Sep 14, 2006 7:03 pm

ahh... you cut the MAF... I ruined one trying to do this. the vibrations from cutting it broke it. make/buy an adapter. That's what I did after I hosed one from cutting.

waldo320 · Post by **waldo320** » Sat Sep 16, 2006 11:27 pm

Well I put the new maf on did not cut it at all and the car still does not idol at all I unplug the maf and the car runs great. I checked to make sure power is comming from the harness and it is also I double checked the fuse and it is good. Honestly I have no clue were to turn at all, could the Iac be bad and be casueing these problems? Seriously how could this stump us I am going to talk to subby pro on monday and hopefully they will have some insight.

sammydafish · Post by **sammydafish** » Mon Sep 18, 2006 7:22 pm

how is your system setup? are you running your MAF in blow through? your IAC taps into the intake after the MAF right? Ig you'er running blow though, your PCV also needs to be eliminated from the intake and routed pre turbo. That is actualy the least ideal but unless you add a second PCV valve it's the only way. If not, the PCV system will draw in unmetered air.

You could also have a leak in an IC pipe or a hose loose. It might not be the MAF being bad at all, just that it's not reading the correct amount of air.

waldo320 · Post by **waldo320** » Mon Sep 18, 2006 7:34 pm

Yes I am runnin my maf in a blow through, yes my iac is after the maf, and yes the pcv is mounted pre turbo on the intake for the turbo so the air it takes in is probley unmetered. Also I have double and triple checked for boost leaks and even when I blow a coupler the car still does not run as bad as it is now.

sammydafish · Post by **sammydafish** » Mon Sep 18, 2006 8:10 pm

waldo320 wrote:Yes I am runnin my maf in a blow through, yes my iac is after the maf, and yes the pcv is mounted pre turbo on the intake for the turbo so the air it takes in is probley unmetered. Also I have double and triple checked for boost leaks and even when I blow a coupler the car still does not run as bad as it is now.

did you disconnect the PCV from the intake and plug in intake manifold? if not, you're drawing in unmetered air which could be causing your problem.

waldo320 · Post by **waldo320** » Mon Sep 18, 2006 8:19 pm

Well the pcv goes from a breather in the intake pipe, then goes to the block were it t's then goes to the pcv valve. How would I fix this problem?

sammydafish · Post by **sammydafish** » Mon Sep 18, 2006 8:25 pm

make the PCV draw from pre turbo only. so the PCV should go from pre turbo to the block and both valve covers only. plug up the PCV valve on the intake manifold.

like I said in my previous post, this is less than ideal, but it alows you to run a blow through MAF

waldo320 · Post by **waldo320** » Mon Sep 18, 2006 9:31 pm

No change at all, I also tried a new tps but no change there so ?????

waldo320 · Post by **waldo320** » Tue Sep 19, 2006 3:13 pm

I was just doing some research and found that a bad ground can casue some maf problems of running rich. Also if I had a bad ground when I unplug the harness to the maf the ground would not matter would it?

sammydafish · Post by **sammydafish** » Tue Sep 19, 2006 4:41 pm

no, the ground would not matter if it's unplugged... one thing that does tend to go bad is the wiring at the MAF, usualy from tugging when unplugging it. I've had to fix it on a few cars. You might want to test continuity and resistance of the harness from the MAF to the ECU and check the grounds while you're at it.

legacycentral bbs

A forum for 89-94 BC-BF(BJ) Legacy Owners and Fans

Maf problem?? I stumped subaru can I stump you?? :)

Maf problem?? I stumped subaru can I stump you?? :)