Has anyone ever heard their engine start to ping when passing in a higher gear? It sounds like someone tapping on the exhaust for about 3-4 seconds and then it is gone.The motor never loses power that I've noticed.In the lower gears,no ping. The truck just turned 194k.I was planning to rebuild at 200k +/- a few miles. I think that it might be the timing chain having to much slack.I havent checked the timing yet. ANY IDEAS?

nomad.


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92flareside 302-5speed
k&nfilter,march underdrive pulleys,flex-a-lite fan,heddman headers w/ true dual exhaust

 

I have this same problem when I use 87 octaine. If I use 88 or 89 the problem go away. The citgo stations around here have 87 , 88 , 89 ,91 , 93 gas. So I have tried a few different types. The 88 usually costs $.02 more. My engine used to do it often. But after the few mod's that I have performed I can run 87 with only minor noise infrequently.

Mike J.

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1997 F-250 HD (old style) Supercab 4x4 w/ 7.5l 460. Jacobs Electronics Ceramic 2000 plug wires, Side-gapped Autolite plugs,Synthetic Oil, K&N air filter, Tonneau cover and bedliner are my only upgrades so far.

 

I know on my 302, I HAVE to run at least 91 octane for the truck to run correctly, because of the chip, otherwise it will Ping like it came from hell. Nomad, try retarding your timing a bit. Mine is set at 14 BTDC, but you might try 12 or even 10. That should help some.

 

MJ-Ive tried 89octane this wekend on a road trip -it still did it although not as much. will try supreme unleaded.PASTMASTER-I'm probably going to retard it to 10 deg.-I'm kind of waiting b/c wife ordered jacobs ignition sys for me for christmas( she cant cook but knows how to make me happy!) MJ-I saw you were asking for input on these things, I'm getting the pro performer for street application not the milage master pack but will keep you posted on how it does.

THANX FELLAS
Have a very merry and a happy happy
Nomad

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92flareside 302-5speed
k&nfilter,march underdrive pulleys,flex-a-lite fan,heddman headers w/ true dual exhaust

 

All of the other suggestions should help, but with that many miles on it, put in a new timing set !!! I would do that first.
Take care,
~Chris

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'95 Eddie Bauer F-150 SC & '64 Falcon/Ranchero
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Nomad,

Excellent. I have been thinking about the pro-street instead of the mileage master. It will be in Jan. that I order mine. I am very interested to see any results that you achieve.

Keep me posted.

Mike J.

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1997 F-250 HD (old style) Supercab 4x4 w/ 7.5l 460. Jacobs Electronics Ceramic 2000 plug wires, Side-gapped Autolite plugs,Synthetic Oil, K&N air filter, Tonneau cover and bedliner are my only upgrades so far.

 

A timing chain might effect your pinging? but I doubt it.I would think that the chain strecth would retard your cam slightly not advance it. With that many miles I would tend to think that your engine may just be lugging a little harder because of power loss due to age. Also you may have a carbon build up which my have increased your compression enough to cause pinging under the load. also if your truck is old enough to have a vaccum advance. make sure it is in good shape and not sticking fully advanced. good luck.