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Old 12-06-2001, 12:51 AM   #1
Scooby Newbie
Member#: 9528
Join Date: Aug 2001
Location: Western slope Colorado, USA
1999 Impreza RS

Default Third MAF crashes w/JC sports intake

I just had my third MAF crash while I was trying to pass a semi on an uphill stretch of I-70. It crapped out as I neared the halfway point of the truck with the throttle nailed in third gear. Scared the c..p out of me. Does Subaru know there is a problem with the MAF sensors on the '99 RS? In defence of the JC Sports people, they told me that if I went outside of the thirty day warranty on the new MAF sensor, they would help me get another one in warranty; I will test their constitution tomorrow.
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Old 12-06-2001, 02:37 AM   #2
Scooby Newbie
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
98 My FMIC
Is bigger than yours.


It seems to me the only logical reason that Subaru changed was to keep people from screwing with the intake.

Is there any way to put a '98 maf in a '99 without having to do major rewiring?
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Old 12-06-2001, 11:20 AM   #3
Scooby Newbie
Member#: 4915
Join Date: Mar 2001
Location: Colorado Springs,CO, USA
2002 WRX Sedan


Good luck on getting anything from JC Sports..... They went bust....

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Old 12-06-2001, 12:28 PM   #4
Scooby Newbie
Member#: 419
Join Date: Oct 1999
Location: Fargo, ND, USA
2002 WRX


I don't think there is a problem with the MY 99 MAF if used on a stock intake system. Many people have thousands of miles on their Imprezas with no problems. I've heard countless stories of it failing with a wide variety of aftermarket intakes. I don't think anyone has isolated the cause yet. I've read it could be vibration, increased air velocity, particles passing through the high flow filters damaging the wire element.....

So I guess you have to weigh the extra performance you get from the aftermarket intake to having the stock stable intake. Personally, I don't think I would fool with the MY99 air intake.

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Old 12-06-2001, 09:44 PM   #5
Scooby Specialist
Member#: 9243
Join Date: Aug 2001
Chapter/Region: NESIC
Location: Suffield, CT
05 Nissan Titan
06 B9 (hers)


There are intakes that work with the 99 MAF sensor. There have been tons of threads in here warning of wich intakes work and which don't. Most of the intakes that seem to work retain the torque box (black box at the back of the engine) and securely mount the MAF sensor and protect it from excess vibration. I think Ganzflow is making one using a PRM inline filter now.
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