The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:
SVXBot

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #1  
Old 04-24-2015, 10:29 AM
Jvan Jvan is offline
Registered User
 
Join Date: Oct 2003
Location: Chappaqua,NY
Posts: 452
MAF sensor swap question

My 94 SVX has stalling problem due to the MAF sensor. I have tried to spray clean it but problem still exists. A new one from the dealer is about $400 and ebay lists mostly re-manufactured ones for about $170. Ebay has tons of MAF sensor for Legacy's/Impreza's/Forester's for $23/$60+ and $!00+; the part #'s are almost identical to the SVX # except for the last 4 digits (SVX- AA200 and others are 2 digits/letter and digits ranging from 160 to 201). They all look the same, so are any other Subaru model MAF sensors compatible/swap for the SVX.Subaru raided the parts bin for many other part (Legacy calipers) so I'm sure that they didn't make a MAF sensor just for the limited SVX.
Reply With Quote
  #2  
Old 04-24-2015, 11:10 AM
gwynethh's Avatar
gwynethh gwynethh is offline
Registered User
Subaru Silver Contributor
 
Join Date: Jun 2012
Location: Kittery, ME
Posts: 394
Re: MAF sensor swap question

Someone said they work just fine except for the very highest rpm/air flow. Fine for everything except maybe the track.
__________________
"Peace is the flower of justice."
Reply With Quote
  #3  
Old 04-24-2015, 02:16 PM
Blacky Blacky is offline
51 Club
 
Join Date: Aug 2008
Location: LSM, Quebec
Posts: 2,205
Registered SVX
Re: MAF sensor swap question

Did you look at the "How To" for re-soldering the connections inside, it's really simple and works.
Reply With Quote
  #4  
Old 04-25-2015, 01:21 AM
1986nate 1986nate is offline
Senior Member
Subaru Silver Contributor
 
Join Date: Sep 2008
Location: Meadville, PA-but I'll still travel
Posts: 4,675
Registered SVX
Re: MAF sensor swap question

An EJ MAF should only be used for diagnostic. It does not measure the air properly ratioed for the SVX ecu and will run the car lean. This is bad for long term use. So, to confirm yours is bad, and someone has an EJ Subaru with a MAF, go ahead and swap to confirm. Then get a replacement.
Reply With Quote
  #5  
Old 04-25-2015, 06:46 PM
Jvan Jvan is offline
Registered User
 
Join Date: Oct 2003
Location: Chappaqua,NY
Posts: 452
Re: MAF sensor swap question

No, I didn't look on how to re soldering since other Subaru MAF sensors were so inexpensive but if the other Subaru Mafs don't work, I'll have to try it. I'm not about to spend $400 for something that can be bought for other cars at a minimal cost.
Reply With Quote
  #6  
Old 04-26-2015, 06:36 AM
gwynethh's Avatar
gwynethh gwynethh is offline
Registered User
Subaru Silver Contributor
 
Join Date: Jun 2012
Location: Kittery, ME
Posts: 394
Re: MAF sensor swap question

Quote:
Originally Posted by 1986nate View Post
An EJ MAF should only be used for diagnostic. It does not measure the air properly ratioed for the SVX ecu and will run the car lean. This is bad for long term use. So, to confirm yours is bad, and someone has an EJ Subaru with a MAF, go ahead and swap to confirm. Then get a replacement.
Thanx for the info Nate!
__________________
"Peace is the flower of justice."
Reply With Quote
  #7  
Old 05-01-2015, 04:58 PM
Jvan Jvan is offline
Registered User
 
Join Date: Oct 2003
Location: Chappaqua,NY
Posts: 452
Re: MAF sensor swap question

Searching through some old MAF threads and came across a thread swapping a N62 MAF sensor from a Z32. Is this a recommended swap for a stock engine or do I need to upgrade injectors and more?
Reply With Quote
  #8  
Old 05-01-2015, 08:17 PM
icingdeath88's Avatar
icingdeath88 icingdeath88 is offline
some sort of nerd. some sort.
Subaru Silver Contributor
 
Join Date: Aug 2009
Location: Tampa, FL
Posts: 3,570
Registered SVX
Re: MAF sensor swap question

You need the whole set - ecutune stage 2 chip, z32 MAF, and 370cc injectors.
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
Reply With Quote
  #9  
Old 05-03-2015, 02:15 PM
1986nate 1986nate is offline
Senior Member
Subaru Silver Contributor
 
Join Date: Sep 2008
Location: Meadville, PA-but I'll still travel
Posts: 4,675
Registered SVX
Re: MAF sensor swap question

Also, fyi. aftermarket MAFs are around $200 new for the SVX with warranty and work well.
Reply With Quote
  #10  
Old 05-10-2015, 08:38 PM
elemgee elemgee is offline
Registered User
 
Join Date: Jul 2008
Location: United States
Posts: 150
Re: MAF sensor swap question

I recently had a problem similar to yours - my SVX would stall when coming to a stop, or right after I accelerated from a stop. I was getting an engine code 23 which is the MAF sensor. I replaced it with one for a 97 Legacy with the 2.5 liter engine which I got from ebay for around $35. Works just fine. Only very small issue was connecting the electrical plug to the sensor was a tight fit, but thats it. Car has been running fine now for a couple of hundred miles. I just checked and there are a bunch of similar MAFs on ebay.
Reply With Quote
  #11  
Old 05-10-2015, 09:10 PM
Jvan Jvan is offline
Registered User
 
Join Date: Oct 2003
Location: Chappaqua,NY
Posts: 452
Re: MAF sensor swap question

I'm very tempted to do the same thing. The new MAF sensors on ebay for other Subaru's are very reasonable but the SVX sensor is way over priced. Even $200+ for an aftermarket isn't reasonable. I'm hesitating because other posts have recommended against using the 4 cylinder sensors. Even the z62 sensor can be purchased new for under $50. I'm driving locally so a few stalls isn't so bad. For $400, I'm going to try to solder the sensor.
Reply With Quote
  #12  
Old 05-10-2015, 10:16 PM
92snowmachine 92snowmachine is offline
Registered User
 
Join Date: Dec 2009
Location: Denver, Colordado
Posts: 832
Registered SVX
Re: MAF sensor swap question

try soldering first but it that doesn't work i would run with it disconnected before paying money for the wrong part. if you disconnect it when the car is off it will run with out it. you will run rich because it will set a code and force the car into open loop but it's a lot better than running the chance of going too lean because your maf is the wrong one.
__________________
Current Stable:
1992 SVX
1979 K5 Blazer Cheyenne
1956 Plymouth Belvedere - Daisy
1967 Chevy C20
1953 Chevy 210
1969 Plymouth Satellite
1949 Chevy Thriftmaster
1959 Chevy Apache
1951 Chevy Stepside
1969 Chevy Camper Special
1978 Ford F150 w/ stroked 460
1986 Volvo 740 turbo wagon
1999 GMC 2500 Creep Van
1994 Impreza Outback
Reply With Quote
  #13  
Old 05-11-2015, 06:20 AM
Sean486's Avatar
Sean486 Sean486 is offline
Happy SVX
Subaru Silver Contributor
 
Join Date: Jul 2005
Location: Mechanicsburg, PA
Posts: 3,348
Registered SVX
Re: MAF sensor swap question

Buy the Legacy sensor and use that to get the car working. Take the SVX MAF Off and resolder it, or send it to someone to resolder it for you. When done, swap them and put the Legacy MAF on the shelf for backup.
__________________
1992 SVX LSL 170k [I]4.44 Transmission, Ecutune TCU, Ecutune Stage 1, transmission cooler, silver STI BBS wheels, Sony Bluetooth double DIN head unit, Infinity front speakers, Lamin-X protected headlights
2010 Mazda 6 i Grand Touring - 120K
2007 Honda Odyssey EXL - 100K
2004 Mazda 3 S - 106K
-----------------------------------
1995 SVX Lsi Polo Sold at 118K 2007
2006 Mazda 5 Sold at 60K 2012
2005 Mazda 6i Sport Sold at 206K 2013 great car[/COLOR]
Reply With Quote
  #14  
Old 05-11-2015, 09:16 PM
1986nate 1986nate is offline
Senior Member
Subaru Silver Contributor
 
Join Date: Sep 2008
Location: Meadville, PA-but I'll still travel
Posts: 4,675
Registered SVX
Re: MAF sensor swap question

Quote:
Originally Posted by elemgee View Post
I recently had a problem similar to yours - my SVX would stall when coming to a stop, or right after I accelerated from a stop. I was getting an engine code 23 which is the MAF sensor. I replaced it with one for a 97 Legacy with the 2.5 liter engine which I got from ebay for around $35. Works just fine. Only very small issue was connecting the electrical plug to the sensor was a tight fit, but thats it. Car has been running fine now for a couple of hundred miles. I just checked and there are a bunch of similar MAFs on ebay.
You also risk burning a valve from running lean along with cat converter failures. Which only show up after prolonged running.
Reply With Quote
  #15  
Old 06-10-2015, 09:47 PM
oab_au oab_au is offline
Registered User
Subaru Gold Contributor
 
Join Date: Mar 2001
Location: Coffs Harb, Australia.
Posts: 4,942
Significant Technical Input Registered SVX
Re: MAF sensor swap question

There is a need to clear this up before it becomes "Internet law".

The graph the Michael showed, has the two curves for the two Mass Air Flow units, they are very similar, slight different at full voltage readings.
The voltage rises as the air flow increases, the ECU uses this to set the fuel and the spark settings, when the voltage signal reaches maximum reading, the ECU goes to the full throttle settings that apply max fuel and spark setting, for a fully loaded engine.



The point that people are missing is that the max. voltage reading for the two units are at different air flows. The 3.3 unit reaches full voltage when it is passing 3.3 lts of air. the Legacy reaches max voltage when it passes 2.2lts. of air. So when you fit the Legacy unit to the SVX it goes into full fuel and spark settings when 2.2lts is passing, it then holds this same voltage setting while the last 1.1lts is passed.

So it won't run lean, it will actually run the same full throttle settings as the SVX unit does, only doing it 33% earlier.

Of course this will only happen at full throttle, when in open loop, at normal driving in closed loop, the Svx will use the O2 sensors to use the same settings as it does with its own MAF fitted.
__________________
One Arm Bloke.
Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 02:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
2001-2015 SVX World Network
(208)-906-1122