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post #1 of (permalink) Old 11-30-2002, 07:18 AM
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Timing Chain Question

Wow I was chasing a carburetor problem(went out and bought a new one) and it seems I went the wrong way. I checked the play in the timing chain and found 12-13 degrees of turning the crank before the rotor moves. Does this explain the intake backfire, engine missing at mid to high rev's, pinging at bottom of throttle? The strange thing to me is, my timing mark does not bounce around. By the way my odometer is sitting at 133K.
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post #2 of (permalink) Old 11-30-2002, 08:00 AM
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Re: Timing Chain Question

Uhhhhhh.....yes. Time for a new chain!
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post #3 of (permalink) Old 11-30-2002, 08:07 AM
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Re: Timing Chain Question

I rather doubt that's the cause of the problems mentioned,
but that chain and gears should be replaced soon.
Not quite an emergency - yet, but will be shortly.

All that slop will let the cam run slow - retarded, giving
a loss of power but not those symptoms. It would have be
lots more retarded to start acting up that way, like 40+
degrees - and if the loose chain was doing that it would
jump right off, giving more "worser" symptoms - you
wouldn't be chasing a misfire.

"intake backfire, engine missing at mid to high rev's, pinging
at bottom of throttle" - sounds more like ignition problems.

Check the coil output, and coil wire, check for crossfiring
in the cap or even crossfiring between wires.
A good indication of spark jumping out of the wires is a
whitish/blueish mark on the wires, cap, even coil - it's
smoke residue.

Also check advance, if it's advancing too soon it could be
the ping culprit.

To verify whether or not it's fuel, use the propane trick.
It's far cheaper and easier than replacing the carb with
even the cheapest rebuilt carb or even a rebuild kit.

The intake backfire is hopefully just a crossfire.
A bad plug wire on one cylinder often can jump it's spark,
either physically or inductively to another cylinder causing
it to fire when it shouldn't.

Unlikely you'll have to go this far:
If ignition proves to be fine, check compression.
If no problem there, check valve springs - a weak one can
show good compression at cranking speed but cause your

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