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Tractor Talk Discussion Forum

64 Ford with 223 I6 problem

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dhermesc

07-23-2003 06:22:21




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Bit long but bear with me. I have a 64 Ford PU with a 223 I6 that backfires occassionally when under a heavy lug. The compression is low (about 85 to 95 PSI on all cylinders) and vacuum is almost nonexistant. The compression is low because the head was replaced with a head from an older engine (57?) that had larger combustion chambers and the engine does have some wear. I thought my back firing was due to the engine being fuel starved but now I think it mught be the vacuum advance isn't working do to the extremely low vacuum. I have not been able to find any manifold intake leaks so I have know idea why it is so low. Any thoughts?

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wrenchman

07-23-2003 19:37:01




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 Re: 64 Ford with 223 I6 problem in reply to dhermesc, 07-23-2003 06:22:21  
i'd look at the ignition system being it only occasionaly backfires...sounds like carbon tracking in the distributor cap or weak plug wires crossfiring...being it happens under a heavy load...a sticky valve usually acts up more often...low compression shouldn't be a problem unless you are burning oil too...low vaccuum can be contributed to by low initial timing...advance it a little & see what happens...might hook up vaccuum advance to straight manifold vaccuum as that sometimes helps...might also check for wear in the distributor too...

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Rlach

07-23-2003 17:18:58




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 Re: 64 Ford with 223 I6 problem in reply to dhermesc, 07-23-2003 06:22:21  
You can verify centrifuge advance with a timing light with vacuum line disconnected; then connect the vacuum line and check total advance while openning the throttle; the ignition advance shoud increase with rpm and modulate by openning/closing the throttle. What is the vacuum source : carb port or intake manifold?
Any folks played with the valve timing(low compression, low vacuum!); is the vacuum reading steady or increasing/decreasing rapidly ? well, thats a start...
rlach

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Robert

07-23-2003 13:47:57




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 Re: 64 Ford with 223 I6 problem in reply to dhermesc, 07-23-2003 06:22:21  
The vacuum advance works mainly as you're accelerating (off-idle). As engine RPMs increase, the centrifugal advance (flyweights beneath the points plate in the distributor) take over for ignition advancing purposes. That's a long winded way of saying that if it doesn't backfire when you're first accelerating, then I would tend to suspect burnt valves or fuel problems rather than ignition advance issues. Burnt valves (or not seating properly would also explain low compression).
Hope this helps, and Good Luck!

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dhermesc

07-23-2003 14:03:15




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 Re: Re: 64 Ford with 223 I6 problem in reply to Robert, 07-23-2003 13:47:57  
Robert:

Thanks, it gives me a place to start, as the backfiring only happens while attempting to maintain speed up hills under lug. The head itself should be in pretty good shape as all the exhaust valves and seats where replaced in the last 3000 miles, intake valves and seats looked fair. My first guess about it being fuel starvation might be correct, any guess on the extremely low vacuum?

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Robert

07-23-2003 14:19:21




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 Re: Re: Re: 64 Ford with 223 I6 problem in reply to dhermesc, 07-23-2003 14:03:15  
In the past, when I've suspected a vacuum advance problem, I would first remove the distributor cover, and suck on the line going to the advance, to see if it even moved. If it did, then I knew it was working. It really shouldn't take a lot of vacuum to move the plate. As for low vacuum, it could be an intake gasket leak, a carburetor to intake leak. To see if you have a leak, try spraying some WD 40 around those places. If the rpm changes, you've found your problem. Also make sure your line is a snug fit where it connects to the carburetor and distributor.

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