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Old 09-09-2006, 05:39 PM   #1
boostedscooby2002
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Join Date: Apr 2006
Location: London, Ontario, Canada
Vehicle:
2002 Subaru WRX
UR Stage3 fmic vf34

Default Do I need a new MAF???

I just got my Tactrix datalogging cable. I have been having low boost/low power issues for the last few weeks and can't seem to figure out why. Car is ecutek tuned with 600cc injectors, vf34, fmic.

The following is a link to one of my latest datalogs.... Are the MAF readings too high? If not, does anything look out of the ordinary? Boost is supposed to be at 18.5psi but I'm only hitting 15psi max. Power comes on very slowly.

http://ca.geocities.com/thumper2002@...om/datalog.JPG

I believe this was a 3rd to 4th gear pull. Any help is greatly appreciated. Thanks!
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Last edited by boostedscooby2002; 09-09-2006 at 05:46 PM.
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Old 09-09-2006, 10:56 PM   #2
ride5000
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they look too high. what's the temp there?
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Old 09-09-2006, 11:01 PM   #3
Hallis
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Platinum Silver Metallic

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It's the Vista Beta throwing the readings off.

lol j/k
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Old 09-10-2006, 09:24 AM   #4
boostedscooby2002
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UR Stage3 fmic vf34

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Very funny......lol

The intake temperature was 24 degrees Celsius.
So do you think it's the Maf that needs replacing? The only Cell I am getting is a p0172 (running too rich bank 1) which only comes on every few days and only while cruising at about 100km/hr. Could it be a boost leak? I hope not because I've checked everypossible connection and found none. Does wastegate duty seem normal? I ask because the boost come on Verrrrryyyyy sloowwww.

I used to have an uppipe leak... I fixed it, thinking that this was the cause of my low boost problem but apparently it wasn't. Tested compression... 148,148,144,148psi.... seems good. Not burning any oil either.
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Old 09-10-2006, 09:50 AM   #5
Sir_Xenon
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Ver. 7 STi swap'd bugeye

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clean the MAF first
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Old 09-10-2006, 10:07 AM   #6
boostedscooby2002
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UR Stage3 fmic vf34

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Yeah I forgot to mention I cleaned the Maf.
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Old 09-16-2006, 09:46 PM   #7
boostedscooby2002
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UR Stage3 fmic vf34

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This is Just an update! I have been going crazy the last few weeks trying to figure this out.... Running Rich, backfiring between shifts,low boost/low power problem. I have gone so far as ordering a new MAF sensor..... This seems to have cured all stumbling issues below 3000rpms or anywhere off boost but I still get major stuttering and only hit 15psi max when on the boost.

Today I went out and got the parts to make up a boost leak tester. LOW AND BEHOLD! I instantly found a HUGE leak on my front mount intercooler. One of the welds let go.... it's a crack about 4inches long....WOW!!!.

Now to find a place that will be able to weld this up. Maybe I'll take it to a local rad shop. Looks like the front bumper will have to be removed to get at it. I've been thinking of using some JB weld on the weld seam temporarily. Does anybody know if this will work?
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