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Mommaburt would know more I think or check out Adept Ape on u-tube may have a video on this.
It' s been quite a few years since I drove one but seems to me you can hear a difference when driving them if one of the iva heads is cracked- maybe blue smoke also? Check for oil contamination on head thru plugs harness. This will cause bad communication
https://www.youtube.com/watch?v=oBo7vLA3uF4&t=604s
added video link

Replaced actuator, passed test no more codes. Problem solved.

Thanks!

(12-08-2023 )Nerv Wrote: [ -> ]Replaced actuator, passed test no more codes. Problem solved.

Thanks!

Now is the task of finding out why it failed to begin with... so that it does not happen again (something causing it) ... or if the rest of them need replacing (simply worn out).

(12-08-2023 )Rawze Wrote: [ -> ]

(12-08-2023 )Nerv Wrote: [ -> ]Replaced actuator, passed test no more codes. Problem solved.

Thanks!

Now is the task of finding out why it failed to begin with... so that it does not happen again (something causing it) ... or if the rest of them need replacing (simply worn out).

seen this lots on the accert kittys most of the time the fella that was in the top end didnt tie wrap the wiring to the provided loops in the rocker box the wires contact the valvetrain and rub out shorting the coil. i have had the wiring rub out so bad it shorts the ecm and had the jakes not working on medium or high.