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No just one visit so far. Hopefully this will solve the problem.

I listed the replaced part under post 43 above. Camshaft actuator that does the variable valve timing thing

i took mine off last sunday, and the world paid me back by snowing wednesday and again saturday here in northeast! i wonder if the vibration is because the bolt pattern of the car is 5 x 114.3 (4.75"), but the wheels are built to european specs and have 5x114 pattern. i just wonder if it is...

end of winter summary for 5BW snow tires - the Nokians (made in Russia - bad) in 275/35/19 fit fine on all 4 corners with the aftermarket wheels i listed a few pages ago. great performance through bad winter weather. i took them off a week ago, and so happy to be back on summer tires. better...

i hope I am not bringing myself bad luck by speaking too soon, but i have had the car back after the service visit for more than 2 weeks - have driven the car many times and no recurrence of the surging while under power. so, even though the engine surges while revving in neutral, perhaps the...

I do all of my own maintenance. On an engine I build myself I do the first oil change early as you suggest. But I have been lead to believe that GM breaks in these engines and changes oil before installation. So my oil changes are 3000 miles as long as I own it It sounds like the PF64 filter...

Yes I have electric blue 5. The color is awesome not subtle. My favorite color on a car ever.

Keeping all my friends here in the loop - I heard back from some higher-ups in-the-know at Cadillac (thanks to my cadillac friends for being so accessible!), and they report the surging i am showing in the recent videos while in neutral not moving is normal behavior for this engine. I'll keep...

Here’s another video that shows the surging increases over a few seconds while I hold the throttle constant in neutral

Thanks for checking. Sounds good for you but maybe not for me. On the other hand, may be the problem we’re both having with engine surging while driving is nothing to do with the Oscillation I’m seeing in a neutral

Seems to be less prominent once engine temp (water not oil) is over 170. Seems to do it from cold start up through 155 plus

Here is another video. Ignore the news radio. Watch the second half to see the surging back and forth of 50-100 rpm or so

I wonder if anyone else's car does this- with engine temp less than 150, hold part throttle while in neutral not moving, at around 1500 rpm. does the tach needle hold steady throttle, or does the engine surge up and down like seen in my video here and previous?

Yes after service visit.

Here is a video of the oscillation when it is mild. in the video, i raise the engine from idle to part throttle and can see in the second half of the video, how the rpms are oscillating or surging despite careful constant throttle while in neutral. i doubt this is normal for this LT4 engine

So, i dropped off my car for a service appt on tuesday morning. the dealership was very nice and gave me a loaner. they didnt do anything to the car until wednesday because their top technician was working on a corvette. took just a couple hours for them to replace the camshaft position...

that dealer told me they are expecting a blackwing order for a customer sometime very soon - they told me in transit. must be yours! so far, service department has been very nice. they have one service guy who appears to work on the vettes and my blackwing. much nicer experience than i had...

I’ll give a full report probably over the weekend.

Well, i had my car in for service for 2 days to change out something for this problem. Not sure if the problem is fixed yet- will forward more info when I have had a chance to drive it, but i have to say, that 2 days in a loaner chevy traverse (which is a fine car i guess), makes me really miss...

I'd like to upgrade my base rear spoiler. i dont especially want carbon fiber - plastic or fiberglass OK with me, or carbon fiber, but not for $600! i do like the look of what you got there. but they also seem to charge a ton for shipping,