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Old 04-08-2019, 08:45 AM   #826
nathanwylupski12
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Default ?

I honestly cant help but reading the other comments have been very educational. I'm completely new to the tuning world. wish i had some knowledge to add besides i feel stupid reading these and not trying them.
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Old 08-31-2020, 10:45 PM   #827
iRishman514
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Quote:
Originally Posted by Irv Weissmanhowerton View Post
Since the last build, I've had problems with my avcs working properly, My left side intake is only coming up to 4 to maybe 6* max, the passenger side comes up to 25 or so, I believe we were going for 30-35 though, during the last removal I saw the cam gear probably wasnt cared for enough while removing the bolts for timing belt removal, My best guess right now is saying its one of the upper (intake) cam gears, but at 150 a piece Id like to know for sure, motor is out right now, Ive had my new kelford cams inspected, swapped avcs solenoids with a working sti's, made sure no filter where in banjo's

Id like to know for sure what it is, I tried everything I could while it was in the car, short of changing cam sensors

Thanks in advance CAR IS AN 04 STI USDM (SINGLE AVCS)

Hey Guys, Did anyone find an answer on this? i have the same issue on my 06 FXT. swapped out both solonoids for new and checked for filters on all banjo bolts with nothing in there. Passenger side ranges from 6-8 and driver side from 24-25
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Old 01-13-2021, 09:01 AM   #828
SubiPCD
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Default Avcs problem

Good day

Now get time to troubleshoot an avcs issue I've been having. Solenoids advancing 6 degrees max. Duty is up to 94% tho. Cleaned the solenoids and same issue.
Some forums saying could be the neutral position switch faulty that disables the avcs. If it was disabled would there still be a 94% duty?
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Old 01-13-2021, 09:06 AM   #829
BlackStig
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Quote:
Originally Posted by iRishman514 View Post
Hey Guys, Did anyone find an answer on this? i have the same issue on my 06 FXT. swapped out both solonoids for new and checked for filters on all banjo bolts with nothing in there. Passenger side ranges from 6-8 and driver side from 24-25
Was the AVCS disassembled? Usually these issues after disassembly are from improper reassembly. The circles NEED to be concentric. I have used a D battery before to make sure that they are aligned while assembling.
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Old 01-13-2021, 09:13 AM   #830
iRishman514
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The aftermarket replaced solenoids were “lazy” according to the shop I ended up bringing my car to. They gave me some known good ones and swapped them in.
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Old 06-04-2021, 08:40 AM   #831
matti11
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delete message, sorry

Last edited by matti11; 06-16-2021 at 05:22 AM.
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Old 09-27-2021, 07:04 PM   #832
JmikeyQ
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Default P0081 timing checked and re timed 5 or more times.. suspect avcs issue after head job

Hoping some on can help, just done head gasket job all runs sweet feels good and smooth but throws up P0081 bank 2 cam and crank correlation.

Checked timing several times, had apart and back together several times sometimes takes up to a week for light/fault to reproduce.

Checked cam advancement and at idle its 0-3 bank 1 and 22-25 bank 2 now what is the desired spec for it at idle I have a new pulley on way to put on bank 2 and already swapped both solenoids and removed filters in banjos no charge yet.

Sorry I just joined and could only post reply rn and not start thread this topic seemed fitting hope thats okay.

Thoughts is it possible to mix up intake cams (im thinking not without checking)
Is it possible the sensor could be reading wrong as it does change from and up to 20-25.

And when new pulley arrives I will be removing all of the avcs to clean out and make sure no blockages what is what im hoping/expecting.

Any inside would be appreciated in to diagnosing this im tired of taking it apart and putting back together lol.
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Old 09-27-2021, 07:27 PM   #833
benflynn
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When mine did this it was damage to the oil port in the gear during installation. Low mile gears cleared it up
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Old 09-28-2021, 04:58 AM   #834
JmikeyQ
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Quote:
Originally Posted by benflynn View Post
When mine did this it was damage to the oil port in the gear during installation. Low mile gears cleared it up
Thanks for your reply im hoping it is the avcs timing gear as it makes sense but ive no way to test or be sure until new one is on. Will let you know soon as it arrives.
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Old 09-28-2021, 11:36 AM   #835
robbieshonda
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Quote:
Originally Posted by benflynn View Post
When mine did this it was damage to the oil port in the gear during installation. Low mile gears cleared it up
Sounds like what i witness most of the time. debris in the intake gear keeping it advanced.
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Old 09-28-2021, 12:02 PM   #836
benflynn
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Quote:
Originally Posted by JmikeyQ View Post
Thanks for your reply im hoping it is the avcs timing gear as it makes sense but ive no way to test or be sure until new one is on. Will let you know soon as it arrives.
You could see the oil port smushed half closed by the locating pin pushing over into it.
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Old 10-03-2021, 09:35 PM   #837
JmikeyQ
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Default Just an update

So I went ahead and changed the timing gear fitted it all back up and im still getting it 18* ish advanced so its better but not happy yet.

So far it has new bank 2:
Timing gear
Solenoid

I have checked and re timed more times than I care to add up.
Im debating should I retard the bank 2 intake timing to see if it makes it better or worse (Just to see if anything changes) or swap out the cam sensor as thats the only thing left.

When I changed the gear I removed valve cover and cams to inspect and all of the vvt oil ways in the cam bracket all looks great.
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Old 10-03-2021, 10:39 PM   #838
benflynn
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Anyone have a recent tuned single 257 avcs map? Wonder what the current timing theories are these days on the avcs
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Old 10-06-2021, 12:42 PM   #839
JmikeyQ
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Default Update

Quote:
Originally Posted by benflynn View Post
You could see the oil port smushed half closed by the locating pin pushing over into it.
So new timing gear and and cam position sensor in and its still advanced 18* bank 2.

Cam carrier is clean and blew through cam oil ways and made sure oilways in cam carrier (where the Solenoid is fitted) is clear and clean all good.

Im dead sure that something must be blocked on the oil return side from pulley to the head or in the head retaining oil pressure and keeping timing advanced.

Does anyone have a cylinder head they could take pics of or look or diagrams for the oil return passages after the Solenoid where it relives the pressure to before I rip it all apart again ***128557;***128557;
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Old 10-06-2021, 07:05 PM   #840
JmikeyQ
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For those that are intrested that may come across this issue after retarding the timing on bank 2 intake gear it brings it back down to 0 degrees now its 100% a tooth out but its fixed it im guessing maybe the heads have been milled several times before im kinda lost at this point

Last edited by JmikeyQ; 10-07-2021 at 04:47 PM.
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Old 02-23-2023, 01:53 PM   #841
Krazyfil
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Why is it so difficult to tune without tgv?
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Old 02-23-2023, 03:19 PM   #842
06rexwagon
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Originally Posted by Krazyfil View Post
Why is it so difficult to tune without tgv?
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Old 10-08-2023, 04:55 PM   #843
spoolinsti05
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How does the ecu calculate the correlation? When the cam sensor is stationary and the gear is hydralically motioned? Its like a turbo. Magical i suppose.

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Old 10-24-2023, 11:53 PM   #844
spoolinsti05
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Quote:
Originally Posted by spoolinsti05 View Post
How does the ecu calculate the correlation? When the cam sensor is stationary and the gear is hydralically motioned? Its like a turbo. Magical i suppose.

Sent from my moto g 5G (2022) using Tapatalk
Does the new sti have 4 cam sensors? Haven't seen one yet. I suppose that wouldn't be a bad idea. Dealing with variable cam gear timing?

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Old 03-10-2024, 08:59 PM   #845
4thgen
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I believe this is where I should be posting. As I have recently had installed a 07 08 09 10 11 12 JDM Subaru Forester XT EJ20X Turbo Engine Replacement of EJ255 in my 2004 Subaru Forester XT mt. I have a few mods headers, injectors, sti turbo, inlet, walbro. It runs but idles pretty low. Also around 5k rpm it refuses to climb. It will putter like a rev limiter. I’ve done some research and read about the EJ20X having dual avcs and the harness from my 2.5 liter ej are not in sync. Am I real deep solution’s?
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