[Chilly1G]

Sounds like you have the Z16XER or Z18XER.

You MUST use 5w/30 DEXOS2, and you must have the engine ECU iVVT adaptions cleared at every oil change. As an owner on here just found out yesterday. Now his car is running 100x better. A GM TECH2 is required.

Hi, this is correct, I have Z16XER

How do I reset ECU iVVT? Will it be possible with OPCOM instead of GM TECH2? I've found the "Erace ECU" option, for factory resetting it, will this do?

Thank you for the answer

 

[Chilly1G]

OpCom does not do the iVVT reset. For this you need TECH2. Its under Engine, Programming, Reset Learned Values, and iVVT Reset.

Actually Ive found it. It was general reset learned values on OPCOM as valer said. After that, car needed 12 seconds to start the first time, like some calibration.

 

[Chilly1G]

All it did was reset the Idle adaption. It has been proven on here before that OpCom does not reset the iVVT.
Just had a member on here visit me this weekend to have this done. He is now shocked at the difference. Especially low rpm driving.

I had "Reset Learned Values". Under there, it resets:

Lambda Adaptation
Throttle Position Sensor Adaptation
iVVT Adaptation

Perhaps you were looking at some other version of OPCOM? I had 3 versions, 2 of them didn't have the "Reset Learned Values", and only the 3rd one had. This should be it, ain't it?

 

[Chilly1G]

@Chilly1G Perhaps post the software version you used,
i don't see many pre 2012 cars nowadays so my go to now is always GDS2

Indeed, I used OPCOM 2012 - VAUXCOM 120309a and I had this option. Even some options, that were shown on other versions and didn't work, they worked here (I tried disabling cruise control because I don't have it, looks like someone played it the car and turned it on, gave me some errors and on this version, I was able to successfully disable it). I was also able to read realistic KM on this versions, as others didn't support it or didn't even show up the function.

Regards

 

[Chilly1G]

Anyway anyhow, rattling seems to be slightly back, mostly. I don't know what else to do... Any ideas? Seems something is wrong. Perhaps oil pump?

Edit: I think the oil should be good, changed a few days ago, OPEL GM DEXOS2™, SUPER SYNTHETIC. This one seems to be the best according to most forums, it should be very good for the car, so I don't think it's oil (except if anyone else thinks differently)

 

[Chilly1G]

Most of issues i've come across with the VVT system on the XER have been down to blocked solenoids,partially blocked oil ways and occasionally the actuators themselves due to wear,
have you removed the solenoids and checked ?

Hi, I just did. Solenoids look okay. Tho, there is excesive gunk on the right side of valves... I really hope this has nothing to do with the rattling, because I'll go crazy. I cant remove gunk without spreading it everywhere

Edit: I cleaned solenoids and swapped them. Hope it's gonna be better. One was new, it was visible

 

[Chilly1G]

Hi, I just did. Solenoids look okay. Tho, there is excesive gunk on the right side of valves... I really hope this has nothing to do with the rattling, because I'll go crazy. I cant remove gunk without spreading it everywhere

Edit: I cleaned solenoids and swapped them. Hope it's gonna be better. One was new, it was visible

View attachment 38160
View attachment 38159

My car started going very slow (acceleration) and I got an error on it 001611. Swapped the solenoid for a new one (the one on the back of the engine) and the car goes now. If anyone has problems. Anyways, the car still rattles on startup. The second solenoid looks quite new.