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SlantSixDan
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PostPosted: Fri Jun 17, 2011 7:25 pm 
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Quote:
points gap
Not on a '73, which has electronic ignition.
Quote:
check rockers..working properly w/valve cover off..visual inspect../pushrods /bent/ wrong adj gap can increase comp.
Already stated multiple valve adjustments
Quote:
any intake leak
Nope. :-(

Thanks for ideas, tho.

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Reed
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PostPosted: Fri Jun 17, 2011 7:26 pm 
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Location: Fircrest, WA
Car Model: 76 D100
OK- here is my dose of FABO advice-

Slant sixes never run right! The best way to fix your pinging is to swap in a 440!

:roll: :wink:
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Rick Covalt
 Post subject: 440
PostPosted: Fri Jun 17, 2011 7:30 pm 
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Quote:
The best way to fix your pinging is to swap in a 440!
That is good advice. Everyone know that a 440 gets better gas mileage than a slant 6 anyway! :lol:

Good luck Dan!

Rick

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USAJon
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PostPosted: Fri Jun 17, 2011 8:00 pm 
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Turbo EFI
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draging brakes?
or non working oil pressure to pistons

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SlantSixDan
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PostPosted: Fri Jun 17, 2011 8:39 pm 
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draging brakes?
or non working oil pressure to pistons
No, and no.

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littleslant
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PostPosted: Fri Jun 17, 2011 8:43 pm 
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You probably checked the PCV and vacuum advance?
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SlantSixDan
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PostPosted: Fri Jun 17, 2011 9:21 pm 
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Yes -- all of that. It's not a simple routine case of ping caused by faulty state of tune. It's internal to the engine. I'm trying to figure out the mechanism, is all.

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sandy in BC
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PostPosted: Sat Jun 18, 2011 9:57 am 
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What do the plugs look like?

Compression test?

Leakdown test?

Vacuum readings?

Litres of oil per 1000kms?

valve timing map?

......or are we just going to guess?

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USAJon
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PostPosted: Sat Jun 18, 2011 11:13 am 
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have you taken off the valve cover started , let idle and observed..look/listen?

I just did that to adj my valves on our 1968..nice show !

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easy803
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PostPosted: Sat Jun 18, 2011 11:51 am 
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Quote:
points gap
Not on a '73, which has electronic ignition.
I know this is a dumb question, but do all 1973s have electronic ignition? :roll:
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Joshie225
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PostPosted: Sat Jun 18, 2011 12:12 pm 
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Electronic ignition was standard equipment in 1973. I do not believe it was a delete option. If so everything was built with electronic ignition.

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SlantSixDan
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PostPosted: Sat Jun 18, 2011 12:41 pm 
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are we just going to guess?
Looks like it. Don't look like we're much into reading the question, either!
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Reed
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PostPosted: Sat Jun 18, 2011 1:45 pm 
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Since we're guessing, Grapes! Gravy! Very small rocks!

Sorry, I couldn't resist the Monty Python reference since we are taking about the machine that goes PING!

Seriously though, it sounds like Dan has investigated all the possible causes of spark knock/preignition. I think this will wind up being an odd internal mechanical problem. That much timing chain slack on a motor with under 60k miles is unusual. I am going to bet a dollar the that problem will wind up being something like loose connecting rod cap bolts allowing the piston to rattle a bit or a loose wrist pin allowing some piston slap to happen, or an exhaust leak.
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emsvitil
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PostPosted: Sat Jun 18, 2011 2:43 pm 
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Pebbles in the hubcaps.........

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Slanted Opinion
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PostPosted: Sat Jun 18, 2011 3:21 pm 
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If you replace the engine and it still has the ping... run away, very fast.

:D :D :D :D :D
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