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Old 07-04-2018, 12:56 PM   #16
Robert Kenney
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Default Re: Can't stop from Pinging

A couple of things. Basically pinging is the combustion pressures reaching the critical pressure before the piston is far enough passed tdc and on its way down. Either reduce burn rate or ignite the fuel air charge later.
1) The introduction of exhaust gas by the EGR valve into the air charge, reduces burn rate and combustion temperatures. This reduces pinging. You should have it working or recurve the advance curve in the distributor.
2) Significantly advanced cam timing will increase cylinder pressures and burn rates enough to effect pinging. Do you have any information regarding the cams installed position. Possible that is a tooth advanced.
3) How old is the fuel? Make sure it is fresh. Not old gas with some new on top. I have had old fuel (2 months) lose octane in my stock scout so far that I had to drain it to stop pinging.
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Old 07-04-2018, 07:07 PM   #17
Jrwittlin
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Default Re: Can't stop from Pinging

Problem solved! And I'm an idiot. I was using the leading edge of the lobe of the harmonic balancer not the timing line. This completely explains why I was "retarding" the timing alot to make it idle and run well (and stop pinging). Turns out that using the timing line I had the initial timing around 20 deg BTDC where it was no longer pinging (what I thought was extremely retarded was still aggressively advanced). I now set it to 12 deg BTDC (using the timing line).

I will try to save face: I missed the timing mark because it was very faint and painted over. When I initially stabbed the distributor and hooked the timing light up the leading edge was the only indicator I saw so i went with it. I figured this out when I was comparing the harmonic balancer from the donor engine and saw a very pronounced timing mark, I then inspected my harmonic balancer and sure enuf there was a very faint line......I highlighted the heck out of the line now.....

Man I feel like a dumbxxx, I am embarrassed to say the least. I share my woes in case someone else can learn from my mistake. Also I owe it to everyone that has helped me. All your advice was spot on! And was what made me check the harmonic balancer.

On the plus side I now have a great running Scout and an ignition that has been cleaned and tested and I've learned a ton.

I cannot thank you guys enuf. I only feel bad wasting your time.
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Old 07-04-2018, 09:43 PM   #18
Scoutboy74
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Default Re: Can't stop from Pinging

You didn't waste our time. That's an honest mistake, although it is the first time I've heard of it happening in my nearly two decades of playing in this sandbox. No harm was done. It was a bit of a learning experience for us as well. I'll tuck this away for future reference in case someone else has a similar issue. I suppose if it can happen once, it can happen again. Good job resolving it and especially for updating us.
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Old 07-05-2018, 08:26 AM   #19
Robert Kenney
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Default Re: Can't stop from Pinging

Good news...
Funny, I'm heading out to verify the timing marks I created when building the 409 in one of my jalopy's. I had degree tape on the balancer but it departed at some unknown point.
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Old 07-05-2018, 11:07 AM   #20
FDChappie
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Default Re: Can't stop from Pinging

Good to here the problem is resolved. Thanks for letting us know what the issue was. ;-)
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