Quote:
Originally Posted by noisemker
But I did notice my valves still seem to have build up on them after 2 separate flushes by two different mechanics.
Went to GM to see what they said and they said they would take the manifold apart and put a cleaner on the valves themselves and manually work the engine anyone think this would be a good idea. Because I’m fresh out of any myself
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They probably just dumped crap into your gas tank and called it a flush and charged you too much. But that doesn't work on these engines at all. So it is as I suspected you are pushing a ton of valve carbon and the timing is probably too aggressive and even worse now.
If GM will do that, go for it. Or try to find a mechanic that will do a crushed walnut cleaning to the valves.