The ALL Florida Online Corvette Club - 427 engine (part 2)

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- - 427 engine (part 2) - RHS block (https://www.corvetteflorida.com/forums/showthread.php?t=44697)

Quote:

Originally Posted by Bob K (Post 122762)

Damn, I've never heard of doing that. Good info Dan and I see Tracy posting also. I wonder what pulling the spark plugs has to do with priming the oil pump? I understand after reading what Tracy posted about the fuel pump relay.

pulling the plugs allows the pistons to move freely and not build up any cylinder pressure therefore allowing the motor to free spin. this helps eliminate any excess force on any metal to metal surfaces, like rod bearings, until oil is pumped throughout the oiling system.

i know of small block Fords that you can take a drill with a socket, remove the distributor and actually turn the oil pump with the drill to fill all the oil passages / prime the oiling system before attempting to turn the motor over with the starter for the first time.

Quote:

Originally Posted by Fatbum (Post 122755)

To prime the pump you have to remove the spark plugs, remove the fuel relay fuse and unclip the coil pack wiring, then turn the car over for 30 seconds, wait 5 minutes then do it again. Adding oil to the filter is a good bet as well.

I doubt Chris did all that work....

I know that Chris (or more accurately, Justin) removed the relay fuse to the fuel pump and unplugged the coil packs, but I honestly cannot remember whether the spark plugs were in place or not. I may have been taking video at that time, so when I get a chance, I'll see if I can find that section of video.

Quote:

Originally Posted by Rich Z (Post 122769)

Not removing the spark plugs puts more wear and stress on the rods/valvetrain etc etc because it can't release the compressed air properly.

I hope your issue is as easy as priming it that simple way, and not something else.

Quote:

Originally Posted by benjamin (Post 122763)

Thanks Benjamin.

Here's the latest video I took of the tune being done to get the idle stable at South Georgia Corvette:

Sounds great Rich hope you have it back soon.

That thing sounds BAD-A$$ :grd:

Sweet sound. Looks good when it is reved up all the pipes are clean without any signs of blue or black smoke and it has a nice crisp note for each cylinder. Beautiful.

Quote:

Originally Posted by Rich Z (Post 122735)

Went up to Thomasville to see them still working on the tune for my car. Apparently there is something wrong in the wiring (possibly) that is making one of the O2 sensors ground out and cause the CPU to try to enrich the fuel to compensate. So the one back starts running REAL rich. They are going to bypass this problem for the time being by forcing the AFR to run in open loop. Once other issues get straightened out, then they will troubleshoot the problem so the car can run in closed loop. Still hearing a chattering from the rocker arm area. Sounds louder on the driver's side. Not sure what that is at this point. Do MSD coil packs make noise? It almost sounds like an ignition spark noise to me.

I just spoke to Aaron a few minutes ago and he said he found an O2 extension cable wire that was pinched at the bell housing, shorting it out, causing the problem mentioned above. So one issue down.

He put a stethoscope to the engine to try to figure out where that tapping is coming from and he said it appears to be at the #5 or #7 rocker arm. The rest of the engine sounds OK. He'll be pulling off the valve cover to check valve lash and just see what he can see. Both valve covers have to come off anyway to check on them leaking oil.

Hopefully this will be coming to a close shortly...

Sounds like Aaron knows his stuff! :thumbsup: