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STI hatch Exhaust AVCS Timing issue
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Old 27 Nov 2017, 03:44 PM   #1 (permalink)
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STI hatch Exhaust AVCS Timing issue

Hi All,

My 2009 STI exhaust valve timing is jumping all over the place on both sides! Inlet are stable and within 1 degree, Exhaust are up down up down on constant throttle and not together at all bit like a see saw and changing values rapidly.

Any Ideas?

It seems odd that both exhaust control solinoids would go together? I am not sure how long this has been an issue as not long bought the car but the previous owner thought something was not quite right as despite large boost and correct fuel ratio, decent torque it is down on power. No fault codes as the timing codes together with many others have been turned off from throwing a cell light by previous mapper.

Thanks for reading.

Simon
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Old 27 Nov 2017, 08:28 PM   #2 (permalink)
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Re: STI hatch Exhaust AVCS Timing issue

What oil is in the car and what are the levels like ?
If its high miles the avcs solenoids have a mesh that can get clogged, if the oil isnt change soon enough.
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Old 28 Nov 2017, 10:43 AM   #3 (permalink)
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Re: STI hatch Exhaust AVCS Timing issue

Thanks for your response. The thing is the inlets work perfectly so don't they need the same oil level (they are higher in the engine as on top of heads unlike the exhaust)?

Hard to read the oil level on the 2.5 but seems half up top side and full up the bottom side so may need a little oil but not low so should not be the issue.

I am thinking solenoids possibly but both?? seems unlikely. More relevant may be the variable Pulley on the left bank exhaust cam is messed up as that would effect both sides. Not sure if the would both do the same thing as they both see saw but not together, maybe slightly opposite so when one is down the other is up which could possibly be the effect of a knackard AVCS exhaust Pulley?

Thanks in advance
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Old 28 Nov 2017, 10:50 AM   #4 (permalink)
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Re: STI hatch Exhaust AVCS Timing issue

oil has recently been changed by a Scooby Tuner and specialist in last 3 months.

On the filters do the Hatches still have filters and if so I cant see where they are on the schismatic that I have on the bottom solenoids. OR are they at the top only? If so then it cant be this as the Inlet Timing works perfectly.

Thoughts?
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Old 28 Nov 2017, 08:27 PM   #5 (permalink)
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Re: STI hatch Exhaust AVCS Timing issue

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Last edited by bugeye_bob; 30 Nov 2017 at 10:05 AM.
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Old 28 Nov 2017, 09:12 PM   #6 (permalink)
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Re: STI hatch Exhaust AVCS Timing issue

Cheers again Bob, the link was for the inlet valves and will need to see if the bottom solenoids have filters on the 2.5 as I think their oil is delivered via passages in the block rather than a separate banjo. So maybe just filtered at the banjo at the top, and as my inlet valves are working fine im not so sure this will be the cause but I may as well check them anyway as you never know. I will remove the bottom OCV's and check they work (not going to touch the tops as they work fine.)

I think it may be the exhaust pulley on the drivers side cam (RHD) as this is the common link between the two. I still find it too hard to believe that both OCVs on the exhaust would both be faulty.

Thoughts anyone???
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