So if you don't mind, I'd like to give my two cents on this. I've never worked on a VZ commodore 3.6 but looking at your data I would 100% say the cam timing is off on bank one. It's all the classic symptoms including low mass air flow, reading, positive to negative bank to bank fuel trims, low compression according to relative compression test, etc. Being that the cam sensors read off the back of the actual cam gears, it doesn't give you the whole picture. All it tells you is that from gear to gear to gear the chain is good. However, if the cam gear pin that locks it to the camshaft has broken and the cam gear is no longer in time with the camshaft you won't see that with a cam crank correlation. I would be willing to bet if you did an in cylinder pressure test on bank 2 and compared it to bank 1 you would see the shift in timing. I've been down this same path and it beat me down pretty good 😂 and it ended up being a sheared keyway on one bank. Anyhow, just my two cents. Great video by the way 👍🏼
Holy Crap, is this the man Eric O commenting on my little channel video down under in Oz!!! You are a legend firstly! Secondly, yes I completely see what you're saying and I was thinking that I should have dug deeper on the in-cylinder pressure test and compared both banks but silly me, I was in tunnel vision into the exhaust restriction at that early point. However the customer didn't want to spend anymore time but sometimes I love doing that just to satisfy my own curiousity and I should have!! Where did one of these beat you down, is it on your channel? I'd love to see it! Thanks for even considering to watch one of my videos!!
Eric this is great, Rob is fairly new to CZcams and runs an outstanding shop in Perth, Western Australia. But you take the time out to watch others and comment. You Sir are a Legend.
@@romanosautomotive No video on it. It was a while back but it has stuck with me 😂. I'm not real good at in cylinder interpretation but short of pulling it apart I can't think of another way.
Welcome back to the CZcams! Great video! How cool to have a personal comment conversation with Eric O. Later this year I’m planning a trip with my daughter into his part of the US. Hopefully we can swing the shop and meet him along our journey.
You can do compression test with the Escope. Go to tool, then choose “compression” next to “Misfire” and you will have to crank the engine for 10 seconds and it will show you the results in colors “ colored bars”.
Great vid. Question, is that one of those cars that shuts the fuel injector off when it detects a misfire? Maybe you could put the scope on the injector control wire to see if it does.
Yes it is. The misfire you saw in the video was the ECU shutting the injector off because it was counting misfires even though it wasn't traditionally misfiring. Thanks for watching!
If for example the exhaust cam timing was out, the pcm would not pick that up due to not having a cam sensor. However, An incylinder test comparing the good bank vs the bad bank might yield some conclusive evidence. Or perhaps a pulse sensor on the exhaust while performing a cranking test? Thank you.
Yes in retrospect, it would have been nice to have time authorised by the customer to compare in cylinder bank to bank. Check out Eric O's comment on here. He's on that thought train also! Thanks for watching!
So if you don't mind, I'd like to give my two cents on this. I've never worked on a VZ commodore 3.6 but looking at your data I would 100% say the cam timing is off on bank one. It's all the classic symptoms including low mass air flow, reading, positive to negative bank to bank fuel trims, low compression according to relative compression test, etc. Being that the cam sensors read off the back of the actual cam gears, it doesn't give you the whole picture. All it tells you is that from gear to gear to gear the chain is good. However, if the cam gear pin that locks it to the camshaft has broken and the cam gear is no longer in time with the camshaft you won't see that with a cam crank correlation. I would be willing to bet if you did an in cylinder pressure test on bank 2 and compared it to bank 1 you would see the shift in timing. I've been down this same path and it beat me down pretty good 😂 and it ended up being a sheared keyway on one bank. Anyhow, just my two cents. Great video by the way 👍🏼
Holy Crap, is this the man Eric O commenting on my little channel video down under in Oz!!! You are a legend firstly! Secondly, yes I completely see what you're saying and I was thinking that I should have dug deeper on the in-cylinder pressure test and compared both banks but silly me, I was in tunnel vision into the exhaust restriction at that early point. However the customer didn't want to spend anymore time but sometimes I love doing that just to satisfy my own curiousity and I should have!! Where did one of these beat you down, is it on your channel? I'd love to see it! Thanks for even considering to watch one of my videos!!
You know you hit the big time when Eric comments on your video. ❤
Eric this is great, Rob is fairly new to CZcams and runs an outstanding shop in Perth, Western Australia. But you take the time out to watch others and comment. You Sir are a Legend.
Solid video and 2 cents. 👍
@@romanosautomotive No video on it. It was a while back but it has stuck with me 😂. I'm not real good at in cylinder interpretation but short of pulling it apart I can't think of another way.
Welcome back to the CZcams!
Great video! How cool to have a personal comment conversation with Eric O. Later this year I’m planning a trip with my daughter into his part of the US. Hopefully we can swing the shop and meet him along our journey.
It's been a decent break and I was shocked Eric O commented 🤣 Starstruck. Hopefully one day I'll be able to come over and meet you guys too!
Escope as well. That’s bloody awesome.
Never ends Dan!
You can do compression test with the Escope. Go to tool, then choose “compression” next to “Misfire” and you will have to crank the engine for 10 seconds and it will show you the results in colors “ colored bars”.
Good one Rob, great to see Eric O following your channel.
Thanks Grunter and great to hear from you too. I hope all is well over in NZ!!
Always a pleasure Rom great vids ...
Thank you for watching!!
Great to see a new video. Very interesting case and a shame you weren't able to follow it through to the end.
Thank you for watching!! Yes I would have love to have dug deeper!
Wonder, are there any noises or signs like valve springs maybe broken?
I would have loved to have dug deeper but the customer didn't want us to spend anymore time on it. Thanks for watching!
Great vid. Question, is that one of those cars that shuts the fuel injector off when it detects a misfire? Maybe you could put the scope on the injector control wire to see if it does.
Yes it is. The misfire you saw in the video was the ECU shutting the injector off because it was counting misfires even though it wasn't traditionally misfiring. Thanks for watching!
If for example the exhaust cam timing was out, the pcm would not pick that up due to not having a cam sensor. However, An incylinder test comparing the good bank vs the bad bank might yield some conclusive evidence. Or perhaps a pulse sensor on the exhaust while performing a cranking test? Thank you.
Yes in retrospect, it would have been nice to have time authorised by the customer to compare in cylinder bank to bank. Check out Eric O's comment on here. He's on that thought train also! Thanks for watching!
💥💥💥 boom
Cheers my man DJ