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Old 01-31-2019, 02:09 PM   #1
.Stichris.
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Member#: 243141
Join Date: Apr 2010
Chapter/Region: SWIC
Location: reno nv
Vehicle:
2004 UNRIVALED BUILT

Default avcs question

I just got my new engine installed and fired up for the first time anyways I got a p2089&p2093 code so I cleaned all the grounds & filters and its still there so I decided to look at the avcs on the access port and the right hand avcs is advancing 3-4 degrees and the left cam is sitting at 0 degrees... so I decide to take the solenoids out and tested both of them they both actuate and move with no issues... in kinda lost have no idea what else to look at...it also idles good but as soon as I give it a little throttle it falls on its face and stumbles... any ideas?
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Last edited by .Stichris.; 01-31-2019 at 02:24 PM.
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Old 02-03-2019, 10:45 PM   #2
slow.wagon
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2008 WRX STI
Lightning Red

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I once had a left exhaust AVCS show 4 at idle then drop to zero real quick. I had no idea it was malfunctioning until I was trying to figure out why I was missing some HP up top. Anyhow, I finally broke down and took the unit off and discovered that a small chunk rtv was jamming the solenoid from fully actuating.
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Old 02-04-2019, 01:46 PM   #3
.Stichris.
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thanks man... but I took them both out and cleaned them really well and there was nothing that was jammed in it... but thanks again for the response
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Old 02-04-2019, 02:12 PM   #4
Hyper
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2.34 LR destroker

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1. how is this build section related? we have service and maintenance forum
2. if you are certain your wiring is in order, take off the timing belt cover and give the AVCS gears few good hits with a mallet, they tend to get stuck sometimes after a rebuild
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Old 02-04-2019, 04:17 PM   #5
.Stichris.
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Join Date: Apr 2010
Chapter/Region: SWIC
Location: reno nv
Vehicle:
2004 UNRIVALED BUILT

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I was waiting for that comment... my bad it wasnít in the correct section sorry I donít live on this forum. i just figured it had to do with the build 🤷🏼*♂️. anyways thanks for the help man I will make sure I smash the **** out of the avcs gears..
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Old 02-11-2019, 02:32 PM   #6
Bamofo
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TurboMike Tuned 2.35

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Quote:
Originally Posted by .Stichris. View Post
I just got my new engine installed and fired up for the first time anyways I got a p2089&p2093 code so I cleaned all the grounds & filters and its still there so I decided to look at the avcs on the access port and the right hand avcs is advancing 3-4 degrees and the left cam is sitting at 0 degrees... so I decide to take the solenoids out and tested both of them they both actuate and move with no issues... in kinda lost have no idea what else to look at...it also idles good but as soon as I give it a little throttle it falls on its face and stumbles... any ideas?

Well before you go send stuff to the other part of the forum you need to give us more information. The AVCS system on start will be at random locations. The fact your seeing them do something is encouraging. You can track it with a logging tool and after the car gets to a specific idle... i think its around 1050 or 1100 idle the AVCS "should" 0 out. But the fact that your AVCS is throwing HIGH circuit for both sides... leads me to think you have a wiring issue. If you unplug both and you still have the same error.... thennn you know its wiring and not to play with the solenoids... Good luck sorry everyone is so grumpy.
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Old 02-12-2019, 09:21 AM   #7
.Stichris.
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2004 UNRIVALED BUILT

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alright well I did what the service manual says I disconnected the wireharness from the ecu and from the selonoid and the wire harness was showing 0 ohms and the service manual says if itís less then 2 to check the selonoids and it says they need to be 6-10ohms and the driver side sat rock solid at 6.8 but the passenger side showed 6.9 with spikes up to 7.8 then back down to 6.8 then spike back to 7.8 ohms... so then I plugged the harness in and checked it at the ecu and they were both around 7.0-7.1 ohms so itís within specs! just the spikes idk about
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