[HWYSTR455]

Yeah, it 'seems' it was less of a knock, but when I heard the vid, it sounded the same. In the vids, it's more pronounced than in person, or at least that's what I recall. And I could have been mistaken, or wishful!

I really don't mind if people prove me wrong, I'm not that sensitive of a person, this is a very lucrative situation, and I'm just trying to check boxes off. I just feel there are still some unanswered questions is all, certainly not trying to say anyone is 'wrong'. It's frustrating to get second hand info too, sure the guys that were working on it would explain better.

Like I mentioned before, the vacuum gauge shows a flutter, and it coincides with the miss. I still feel that is key, and that there is some type of abnormal combustion, ignition issue, lean issue, or something. But that's just a gut feeling, other than the obvious miss, and the vacuum reading, there's nothing else that in my mind can cause that miss/vacuum issue.

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[HWYSTR455]

This video:

https://www.youtube.com/watch?v=25qdxORqRsI&t=1s

The first 45 seconds, they are revving the engine to like 3500, and turning the dizzy several times. That's what I'm questioning. What's the purpose of that? They rev, he reads the timing, they let it idle down, and turn the dizzy without checking the timing before they rev it again. Then the next vid, they go to start it, and it lugs during cranking. That to me says too much initial timing.

I could be wrong, but that's what it looks like to me. And I'm looking at the coil, and the same ignition 12v wire is on there, which has a spliced wire in it.

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[HWYSTR455]

Both the vids in post #801 are already after I switched the wire back from the direct batt one to the original ignition one, and had turned the idle speed down while it was not running. I know because I laid the wire across the engine and throttle cable over to the batt.

I dunno, I'm just trying pointing out stuff that's different from when it was on the dyno is all. There was one vid that was before the ones that were posted. And I honestly can't remember the sound from that vid, I've watched a bunch back to back and just can't tell/remember.

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["QUICK-SILVER"]

With the PCV plumbed in the middle of #1 intake runner....It's going to have a lean miss. The closest idle mixture screw would have to be backed out for it to hit and would make #3 run rich. Balancing act at best. No even turns on mixture screws on front. At least till a fitting gets put in front plenum.

Clay

[MrParty]

I don't know much but why not put the engine on a run stand? That would eliminate anything with the car and would make it easier to get around and hear things. I understand it's more $$ unless you can borrow one but it would help eliminate things. It would also tell you if it's 100% the engine.

[Pronto Poncho]

Originally Posted by MrParty

I don't know much but why not put the engine on a run stand? That would eliminate anything with the car and would make it easier to get around and hear things. I understand it's more $$ unless you can borrow one but it would help eliminate things. It would also tell you if it's 100% the engine.

Definitely in the Motor.

The engine was run with the following removed. All belts, Fuel pump and torque converter completely disconnected. It was sitting there Virgin on the frame without anything attached. Unfortunately it did not make any difference.

It has been gone over with a mechanics stethoscope and run with valve covers off. With no change. Every possible test has been done to further evaluate the valve train with no results. The only signature picked up on the stethoscope was at the base of the distributer and the oil filter receiver.

In over 30 years of Pontiac engine experience this is the first time I have ever seen something like this that could not be easily identified.

[Va68goat]

DOC,
No...Jeff said he found someone to come take a look at the motor. I'm hoping thats going to happen. No plans for me to disassemble this motor at this time.