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Old 04-12-2002, 06:36 PM   #1
Constantinos
Scooby Newbie
 
Member#: 10860
Join Date: Oct 2001
Location: Ottawa, ON, Canada
Vehicle:
1990 legacy
white

Default Mass Air Flow senser problem ...HELP!!

I was wondering if anyone out there can help me. I checked my "check engine light" and it gave me a several codes. Two of them were "airlfow meter circuit" and "airflow sensor", the thing is I have a K&N cone filter. Could this cause a problem with the sensor, if so how can I fix it and still keep my filter. Also it showed that there was a problem with my "crank angle sensor", what does it do, also could this be caused by the under-drive pulley.
Thanks Costa.
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Old 04-12-2002, 11:51 PM   #2
Fred Zaplitny
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Member#: 92
Join Date: Jul 1999
Location: East Detroit, Michigan
Vehicle:
1999 2.5RS Coupe
Blueish Kind of

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Did you reset your ECU after these mods? If not, yes and yes to your answers.

I'm basing this off my knowledge of newer Scoobys though, I don't know much about 1990 Legacies. Give it a shot though, it doesn't cost anything.
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Old 04-13-2002, 04:30 AM   #3
Need4Mods
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Join Date: Apr 2002
Location: Portland, Oregon
Vehicle:
2002 WRX - Sedan
WR Blue w/JDM Rear Wiper

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Definetely would have to agree with resetting the ECU. I would unplug both terminal from the battery and let the car sit powerless for a full night. In the morning (or later afternoon depending if you sleep in or not ) plug both terminals back on and drive how you are going to drive the car for about five miles.

I talked with a certified Subaru mechanic and they claim that the ECU can relearn your driving habits within five miles. I'm skeptical it can learn this fast, but nevertheless, your MAF is getting way more air than before and will have to relearn how to handle all that air. I'de say get a TXS Turback Exhaust system with an Unichip IMHOP, that'll cure the damn CELs! . . . in theory anyhow.

Peace
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Old 04-13-2002, 01:47 PM   #4
HndaTch627
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Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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ummm....well FYI if you are throwing all 3 of these codes your MAF is junk....there is no need to reset the ECU every time you add something, the ECU is capable of learning the fuel trim. You are throwing malfunction codes and on an OBD-1 vehicle that usually means there is a fault. Did you overoil your K&N?? I have seen that blow MAF's in the past. It has nothing to do with resetting your ECU.

Jeremy
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Old 04-13-2002, 11:21 PM   #5
Constantinos
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Member#: 10860
Join Date: Oct 2001
Location: Ottawa, ON, Canada
Vehicle:
1990 legacy
white

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Thanks for your replies, I'm going to try and reset the ECU and check my MAF sensor. If the MAF sensor is junk would it tamper with the performance of the engine. Such as less gas milage, reduced power, and produce a high idle speed. Whould you guys know what type of symptoms it could produce.

Thanks Costa
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Old 04-14-2002, 05:39 AM   #6
HndaTch627
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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Quote:
Originally posted by Constantinos
Thanks for your replies, I'm going to try and reset the ECU and check my MAF sensor. If the MAF sensor is junk would it tamper with the performance of the engine. Such as less gas milage, reduced power, and produce a high idle speed. Whould you guys know what type of symptoms it could produce.

Thanks Costa
everyone of those is a viable problem....it all depends on how the car is programmed for limp home mode. Some ECU's run the same w/ them unplugged where others won't even run.

jeremy
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