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Old 10-07-2014, 03:34 PM   #1
andysrt
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Default AVCS questions and missfires

Is there supposed to be a difference in degrees between left and right on start up? At idle avcs in left reads 22 to 25 degrees and avcs in right reads 7 degrees. My car idles rough on start up and throws missfire codes on all 4 cylinders along with PFFE . No issue's otherwise. The car is definitely not missfiring all the time. I did change from a dual mass flywheel to a singlemass stock flywheel. that was close to 30k miles ago and the codes didn't start until a few weeks ago. Any ideas? Its a 06 forester xt by the way.

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Old 10-07-2014, 03:45 PM   #2
Badler
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Timing belt probably jumped a tooth or two.
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Old 10-08-2014, 09:36 AM   #3
elandman
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AVCS should match at all times within a degree or two
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Old 10-08-2014, 11:17 AM   #4
andysrt
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I'm going to do a log tonight on the way home from work. Any specific thing i should log other than avcs left and right and the ocv.

Thanks

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Old 10-08-2014, 06:10 PM   #5
andysrt
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Ok i data logged on the way home one side stayed between 23-25 the other was between 7 and 9 no matter how much throttle was applied. Whats the next step or how do i check the avcs and ocv?

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Old 09-06-2020, 10:42 PM   #6
iRishman514
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Quote:
Originally Posted by andysrt View Post
Ok i data logged on the way home one side stayed between 23-25 the other was between 7 and 9 no matter how much throttle was applied. Whats the next step or how do i check the avcs and ocv?

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Bump this. I have the same issue. Anyone know?
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Old 09-11-2020, 11:55 AM   #7
subaru_gc8
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Quote:
Originally Posted by andysrt View Post
Ok i data logged on the way home one side stayed between 23-25 the other was between 7 and 9 no matter how much throttle was applied. Whats the next step or how do i check the avcs and ocv?

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I had that problem with my jdm ecu, we changed the pulleys and it still persisted, come to find out it was the ecu that had the problem.. I would suggest if you can get another ecu first as it is alot easier to change than the pulley
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Old 09-12-2020, 11:21 PM   #8
iRishman514
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Quote:
Originally Posted by subaru_gc8 View Post
I had that problem with my jdm ecu, we changed the pulleys and it still persisted, come to find out it was the ecu that had the problem.. I would suggest if you can get another ecu first as it is alot easier to change than the pulley


Thanks for the help. The ecu swap on my car is quite challenging with it needing to flash for the immobilizer.

Today I re-timed the car, tapped the AVCS gears with a rubber mallet, did an oil and filter change with disconnecting the battery.

Didn’t really notice any slipped timing belt, though the drivers Intake cam may have been off by one tooth.

Drove the car for about 5 min and voila, AVCS on both sides went down to zero at idle and increased with the throttle.
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Old 09-13-2020, 01:21 AM   #9
subaru_gc8
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Quote:
Originally Posted by iRishman514 View Post
Thanks for the help. The ecu swap on my car is quite challenging with it needing to flash for the immobilizer.

Today I re-timed the car, tapped the AVCS gears with a rubber mallet, did an oil and filter change with disconnecting the battery.

Didn't really notice any slipped timing belt, though the drivers Intake cam may have been off by one tooth.

Drove the car for about 5 min and voila, AVCS on both sides went down to zero at idle and increased with the throttle.
nice glad you got it fixed, but I would change which ever one is sticking
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Old 09-13-2020, 01:16 PM   #10
iRishman514
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Quote:
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nice glad you got it fixed, but I would change which ever one is sticking


They both were stuck.
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Old 09-13-2020, 04:48 PM   #11
subaru_gc8
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Quote:
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They both were stuck.
so one was stuck on high and one on low?
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Old 09-14-2020, 01:10 AM   #12
iRishman514
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so one was stuck on high and one on low?


Correct. Passenger stuck on 6ish and driver stuck on 25ish
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