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Old 04-29-2009, 05:07 PM   #1
subadrew99
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Member#: 204755
Join Date: Mar 2009
Default MAP or MAF

Hey just looking for some insight
i was under the impression that the 98 impreza 2.5rs had a MAF sensor and that in 99 it changed to a MAP sensor; however, my 99 just pulled a MAF sensor circuit low CEL so i'm wondering what's up.

if you guys can help me out that would be great
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Old 04-29-2009, 05:09 PM   #2
shanemono4
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Join Date: Mar 2008
Chapter/Region: RMIC
Location: UT
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2003 2.5rs
PSM.

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if the sensor is by the throttle body it's map, if it's on the end of the intake almost near the filter it's maf. Not the most precise answer haha but there it is.

EDIT: You might get flamed for not searching, btw.
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Old 04-29-2009, 10:01 PM   #3
euro_tech
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Chapter/Region: TXIC
Location: San Antonio
Vehicle:
1999 legacy outback
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come again?

Maf sensor is located in the intake tract near the air box. Map sensors are mounted directly to the intake manifold or have a vac line from the manifold connected to them. (if they are remotely mounted..
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Old 04-29-2009, 10:39 PM   #4
Odyknuck
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99 was the trasnsition year from DOHC to SOHC motor. I believe the DOHC still used the MAF and the SOHC used the MAP.
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Old 04-29-2009, 10:54 PM   #5
euro_tech
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Quote:
Originally Posted by Odyknuck View Post
99 was the trasnsition year from DOHC to SOHC motor. I believe the DOHC still used the MAF and the SOHC used the MAP.

correct
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Old 04-29-2009, 11:12 PM   #6
subadrew99
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any possible way to have a SOHC with a MAF sensor? It's actually my buddy's car and he swears it is a SOHC. I'm going to check it out tomorrow what is the easiest way to check if it's a SOHC or DOHC?
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Old 04-29-2009, 11:38 PM   #7
Storm
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^^^Yes, that was possible and actually quite common for the 2.5RS. It mighta been different for the Legacy or Forester, but most of the 99 2.5RS' had MAF based SOHC engines. FWIW....the MAF sensor for the 99 model year is notorious for going bad. Fortunately, you can replace the element part and keep the old housing. High flow air filters (and over-oiling them) have been blamed for many of those failed MAFs.....


Jay Storm
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Old 04-29-2009, 11:51 PM   #8
subadrew99
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^^^thanks jay!
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