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Violent Idle When PCV Connected
https://www.slantsix.org/forum/viewtopic.php?t=68306		 Page 4 of 4
Author:  morsim [ Sat Aug 23, 2025 11:07 pm ]
Post subject:  Re: Violent Idle When PCV Connected
Quote:
Also, what does the engine oil smell like? Pull the dipstick and smell it. Does it smell like gasoline?
Oh yeah, big time...
I'm getting ahead of myself as I wait for a response here, but as per this post, it could be a ruptured fuel pump diaphragm. Could I have accidentally done that while blowing compressed air from the inlet side to clean it out earlier? That wouldn't explain the burning of the oil though, would it...
Author:  Rick Covalt [ Sun Aug 24, 2025 4:55 am ]
Post subject:  Re: Violent Idle When PCV Connected
Was the oil level over full?
Quote:
That wouldn't explain the burning of the oil though, would it...
Yes it could. The gas would thin down the oil and allow it past the rings much more.
Author:  SlantSixDan [ Sun Aug 24, 2025 11:43 am ]
Post subject:  Re: Violent Idle When PCV Connected
Drain the oil, pronto. It will also be a good idea to service the oil pressure relief valve to make sure it's doing its job, as described in these two threads: thread 1, thread 2.

You likely didn't ruin the fuel pump with compressed air; it probably just failed on its own; that's a thing.

Put in a new fuel pump. Pick carefully; parts-store items currently available are garbage. Get an AC 6972; one of the ones you see here.

And show us those spark plugs.
Author:  morsim [ Sun Aug 24, 2025 12:33 pm ]
Post subject:  Re: Violent Idle When PCV Connected
Quote:
Was the oil level over full?
Yes!

I've been too pressed for time, and I'll be away from the vehicle for a bit... Couldn't get those pics yet since waiting on a friend for the socket after mine disappeared.
I won't let it run with that fuel oil invasion, but not much I can do right now other than let it sit for the time being while I'm away. :(
Quote:
You likely didn't ruin the fuel pump with compressed air; it probably just failed on its own; that's a thing.
Quite the coincidence, same time as the carb rebuild.

Will order a new pump for when I get back. Rebuilt is okay in this instance? (e.g.)
Author:  SlantSixDan [ Sun Aug 24, 2025 3:39 pm ]
Post subject:  Re: Violent Idle When PCV Connected
I know the as-built AC pumps do okeh with curent fuel formulations. No way to know if the rebuilts will, until you try. Odds are pretty good.

Also, to be clear: new oil filter along with new oil.
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