AVCS VVT angle out of sync diagnosis MY07 GT B

[bigBADbenny]

The mineral oil flush was dropped, and Delvac MX 15w40 was put in with a new filter
Hoping the aggressive detergent pack works in my favor.
Ill keep that oil in for a while before trying another flush with 15w60.

I peeled open the 2 day used filter and it was very clean inside, thankfully.

I managed to get romraider/ecuflash working again, it was a ports vs USB pass through related issue.
Old software vs new drivers is my guess.

Matt revised my tune for less popping = win!
Currently I'll be logging to see if any changes and still researching especially about avcs cam sensors as I want to have all (knowledge) bases covered.

I nutted out that removing the avcs solenoid is of course fairly easy as its just held in with a 10mm bolt.
So inspecting/cleaning those is still on the to do list

[<GB>]

Why 15-60?

[bigBADbenny]

Just to see to what extent the avcs issue is affected by oil weight/pressure
It couldn't do too much harm, temporarily at least.

[<GB>]

I wouldnt go 60 tbh

[bigBADbenny]

Fair enough, it's around twice as thick, so maybe ill try 15w50

[bigBADbenny]

I have Logger working again thus I'm back to trying to nut my AVCS issue out before committing to the various fixes...
Thanks to a member's post I'm using the free app MegaLogViewer Lite to graph my logs: its easier than Pages or Excel

Research continues: I found a wealth of info on this forum: http://www.ft86club.com/forums/showthread.php?p=433888
That particular page has some very in depth info about how the whole AVCS system operates.

In my case, based on logging inlet cam VVT angles and their respective OCV currents, I can see one side gets slightly lower amperage(?), but overall, the cams are doing what the ECU is telling them to do.
Thus the ECU could be the source of the issue, or the issue has something to do with the feedback loop between the crank sensor, cam sensors and the ECU.

Idea: I did have a mechanic attempt to install an AEM Failsafe, which required a wire to be tapped into the engine speed output wire from the ECU.
Judging by the FSM, it was supposed to be tapped into a Pink wire from the ECM: C22 P on B136.
When I recently had the ECU out to be unbricked I noticed that the tapped wire was Orange/White: it was tapped into the adjacent C11! WTF?

The FSM has this pic of the plugs going into the ECM, it looks like it should be turned 180 degress for our RHD cars, meaning the wire was tapped into plug B135?
EDIT: the plugs on my RHD GT-B are in the order listed in the screenshot, everything is flipped L-R, a mirror image.

Snipping and taping off that wire has not changed anything so far alas... EDIT: because it was tapped into a dash warning light wire...
I'm still trying to nut out what ECU plug is which but this could be my solution: unravel that install and or get a new ECU... EDIT: not the solution alas...
So I'll take off the ECU cover for a detailed inspection of the wires and plugs.
EDIT: the plugs on my RHD GT-B are in the order listed in the screenshot, everything is flipped L-R, a mirror image.

Could someone please take a look at the attached log for a second opinion?

romraiderlog_20130217_090541.csv.zip

(56.37 KiB) Downloaded 202 times

Its another freeway run 3rd-6th in and out of cruise control.

[jaydece]

this might help?

http://forum.liberty.asn.au/viewtopic.php?f=10&t=9497&start=210


and with the fitment of your AEM failsafe......that is VERY poor form from sharpie

[bigBADbenny]

He was sort of in a rush that morning...
The battery neg was detached at least, but could the ECU be damaged by soldering one of the wires whilst still plugged in?
Inspection is pending...
When funds permit ill get the installers Bruce suggested: Complete Options, to put the AEM right...

[jaydece]

He was sort of in a rush that morning...
The battery neg was detached at least, but could the ECU be damaged by soldering one of the wires whilst still plugged in?
Inspection is pending...
When funds permit ill get the installers Bruce suggested to put the AEM right...

Sorry Ben.....with sharpie caliber? there really shouldn't be any excuses....especially when it comes to paying customers...allot of damage could of occurred...

now....looking at your log just quickly? the way I understand it is....your right cam seems to be the one doing funny things? esp when it starts oscillating ...on constant rpm ranges? and the current oscillates inversely proportional to the cam which is interesting....would be nice to compare logs with someone else's car that doesnt have this problem to compare current and cam values...

this link might help as well http://forums.nasioc.com/forums/showthread.php?t=134854

[bigBADbenny]

Thanks for looking, and yes, that's what I was thinking: compare to a normal log

[<GB>]

so your thinking its not the cam gear?

[bigBADbenny]

The thing is the Lib is very drivable, so I'm not in a huge rush to spend on the complete fix when the source of the issue is unclear.

So I'm enjoying the troubleshooting process of logging and research.

Possible causes, either individually or in combination:

oil (addressed with mineral flush & Delvac 15w40)
AVCS oil lines
AVCS solenoids
inlet cam sensors
tune (briefly logged the stock rom - no difference but may try that again)
ECU
inlet cam gears
stretched/skipped belt
neutral position sensor (gotta log that)
???

Next immediate step is to:
- take the cover off the ECU, pull the battery neg and inspect exactly to what plug and pin the AEM rpm wire was tapped into.
- ID the correct engine speed wire for the next installer (Complete Options)
- make a smaller simpler log eg a short freeway run logging just VVT angles, solenoid current and duty, neutral position sensor, total timing (?) rpm and speed.
Any suggestions?

[<GB>]

why dont you do the oil change first and see what happens first

[bigBADbenny]

Just did that! ^^^ And see edit above for the next steps.
When I have a log that has the relevant parameters and just the right driving, e.g. idle to freeway, cruise & throttle - I'll post it to Romraider and Nasioc for feedback.

In the meantime I'm reading everything online but haven't found anyone with exactly the same issues as mine. (thus the need for an individual prognosis).

[<GB>]

Just did that! ^^^ And see edit above for the next steps.
When I have a log that has the relevant parameters and just the right driving, e.g. idle to freeway, cruise & throttle - I'll post it to Romraider and Nasioc for feedback.

In the meantime I'm reading everything online but haven't found anyone with exactly the same issues as mine. (thus the need for an individual prognosis).

sounds like you need to start spending money... could be hit or miss really. you could sell it