AVCS VVT angle out of sync diagnosis MY07 GT B

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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Tue Jan 15, 2013 6:42 am

Thanks for the info: also posted (with LV screenshots) to the Learning View discussion thread.

I didn't really push the stock tune, but the car felt kinda flat. :P
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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Tue Jan 15, 2013 8:44 am

More :idea: :roll: :oops: penny dropping goodness: Due to the oil use issue, I'd been topping up with 5w30 Edge, which probably thinned the oil quite a bit and either brought on or exacerbated the AVCS issue.
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Re: AVCS solenoids cleaning MY07 GT B

Postby <GB> » Tue Jan 15, 2013 9:54 am

what weight oil are you using now? i would use 10w min with the higher km your car has, i dunno why anyone would put 5w in an older subaru
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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Tue Jan 15, 2013 10:41 am

It was on the shelf in 1L bottles, my bad!

Whats in it is whatever syn Docklands STi use, maybe Edge 5 or 10W40?

The answer is "lack of education" which is why I'm here :wink:
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Re: AVCS solenoids cleaning MY07 GT B

Postby <GB> » Tue Jan 15, 2013 11:20 am

bigBADbenny wrote:It was on the shelf in 1L bottles, my bad!

Whats in it is whatever syn Docklands STi use, maybe Edge 5 or 10W40?

The answer is "lack of education" which is why I'm here :wink:

i dunno what subaru use and what brand it is, i use 15w50 motal lol it was recomended to me.

what are you going to use now?

should use the same top up oil as what was used in the car when serviced, i normally buy 2x 5l so i got some spare and when next service comes i only need one
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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Tue Jan 15, 2013 4:42 pm

Thanks for the advice , buddy :-)

Some heavy hitters have recommended 10W60, and either myself or another member are likely to give that a go very soon.
I just bought Nulon 10W40 from Repco so they might let me swap it out for that.

In breaking news, I hope to have some input on this issue from the new service manager at the cars home garage, Docklands STi. :D
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Re: AVCS solenoids cleaning MY07 GT B

Postby <GB> » Wed Jan 16, 2013 9:24 am

i like the 10 w 50 better ha ha

are you coming to kebab bbb?
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Re: AVCS solenoids cleaning MY07 GT B

Postby bosc0 » Wed Jan 16, 2013 9:27 am

BBB is a slightly used kebab.
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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Wed Jan 16, 2013 9:54 am

Still logging the issue, looks like oscillations in RH VVT angle also happen on cruise at C 2300rpm, in comparison to LH VVT angle which is steady.
This is fascinating, since apart from the LH VVT ocsillation/vibration at C 1400rpm, there's no drivability issues...

I'll log warming up the car, induce the vibration, drive to the freeway, start cruise control and graph the results.

(I want to kebab but its the wife's B'Day!)
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Re: AVCS solenoids cleaning MY07 GT B

Postby bass_straitener » Wed Jan 16, 2013 10:10 am

bigBADbenny wrote:Still logging the issue, looks like oscillations in RH VVT angle also happen on cruise at C 2300rpm, in comparison to LH VVT angle which is steady.
This is fascinating, since apart from the LH VVT ocsillation/vibration at C 1400rpm, there's no drivability issues...

I'll log warming up the car, induce the vibration, drive to the freeway, start cruise control and graph the results.

(I want to kebab but its the wife's B'Day!)


Even heavier hitters say this oscillation can occur upto 2500RPM at which point enough oil is fed to maintain sychronicity and negate the seal leak impact.

Perhaps a log of 2500 RPM + data will confirm. :D

Get some thicker oil in as well. You know the one... :wink:
"If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut."
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Re: AVCS solenoids cleaning MY07 GT B

Postby bigBADbenny » Wed Jan 16, 2013 10:56 am

Seals in the inlet cam, OCV solenoids or the blockage of the oil feed lines is the question I seek to answer with tonight's logging :-)

edit:

proposed schedule of logs:
Parameters: revs, speed, L&R VVT angle, L&R OCV duty (optional)
warmup
induce 1400rpm vibration
cruise at 100kph @ 6th, 5th, 4th gears.

Any suggestions?
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Re: AVCS solenoids cleaning MY07 GT B

Postby bass_straitener » Wed Jan 16, 2013 11:10 am

bigBADbenny wrote:Seals in the inlet cam, OCV solenoids or the blockage of the oil feed lines is the question I seek to answer with tonight's logging :-)

edit:

proposed schedule of logs:
Parameters: revs, speed, L&R VVT angle, L&R OCV duty (optional)
warmup
induce 1400rpm vibration
cruise at 100kph @ 6th, 5th, 4th gears.

Any suggestions?


I'm going with Mick's diagnosis and am buying the part he's recommended. He told me he's taken this whole thing apart and identified exactly what's wrong and it aint the solenoids etc.

The guy genuinely knows his stuff from what I've seen so I'm going with his recommendation.
"If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut."
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Re: AVCS solenoids cleaning MY07 GT B

Postby <GB> » Wed Jan 16, 2013 11:13 am

Is it a secret?
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Re: AVCS solenoids cleaning MY07 GT B

Postby bass_straitener » Wed Jan 16, 2013 11:18 am

<GB> wrote:Is it a secret?


Yes. :lol:

No.

Why?
"If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut."
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Re: AVCS solenoids cleaning MY07 GT B

Postby <GB> » Wed Jan 16, 2013 11:28 am

bass_straitener wrote:
<GB> wrote:Is it a secret?


Yes. :lol:

No.

Why?

cause some people like keeping info with them as they make money and can fix issues other cant, happens all the time bit like the msr anti pop on gear changes
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