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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 06-12-2008   #1 (permalink)
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Default 1966 289c code PCV ?

There appears to be a lot of oil coming from the pcv hose that goes from the valve cover to the carb spacer, the hose is leaking and the clamps that connect it to the carb spacer needs to be tightened obviously. Does this mean that i have a bad pcv valve that i should replace or is this something more serious that is causing the oil?
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Unread 06-12-2008   #2 (permalink)
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could be the rubber grommet in the valve cover is bad and no longer sealing around the pcv, but take the pcv out, clean it up and shake it to see if it rattles, then it's good.
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Unread 06-13-2008   #3 (permalink)
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the pcv valve slid right out no problem. it appears to be the original valve and i shook it and no rattle. also the rubber grommet is no longer rubber it has become harden plastic and i had to do some serious maneuvering to get it out without anything falling down the hole. tomorrow im going to just get a new pcv valve and new grommet and new hose, since the old one appears to be getting brittle. could a leak with the pcv cause any rough idle symptoms?
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Unread 06-13-2008   #4 (permalink)
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can cause a big vacuum leak that could cause a lot of problems.
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Unread 06-13-2008   #5 (permalink)
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Try running your engine w/o the PCV valve, but make sure oil doesn't spray out of the hole, I would say that your grommets definitely need replacing, hard plastic is not what you want in your engine!
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Unread 06-13-2008   #6 (permalink)
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so i got a new grommet, and i had a wonderful time of putting it in . but after i hooked everything back up it still idled rough, more so then it did before i changed the pcv valve. i noticed a few small cracks in the hose around where the clamps go. i pulled it from the carb and plugged the hole and the idle smoothed right out. the problem is finding the correct hose, no one seems to have it. but i ordered it and it should be here soon. amazing how the tiniest vacuum leak and screw everything up
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