Adjusting timing on 96 460?
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Freshman User
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From: Chehalis WA
Adjusting timing on 96 460?
Have had some pinging problems as of late. Wondering what is the proper procedure to check timing on these motors. And what the proper specs are? Is there something you have to unplug to disable the advance? Any insight would be greatly appreciated. Again 1996 460 in a F-250 4x4.
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From: Nevada
I'm not familiar with your particular engine management system, but most have the capability to advance/retard ignition timing based the fuel/compression requirements. Have you checked to see if the system is giving any error codes? Or that your 02 sensors don't need replacing?
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From: Montana
I run my timing at 12 degrees and have no problems with pinging. You have to pull a plug that stops the computer from interfering when changing the timing. On my truck it is near the firewall, close to the fender well. it has a gray top and is not very big.
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From: Chehalis WA
Thanks for the replies guys. It's a process of elimination. It's pinged on 87 and 89 octane since I got the truck used. (Only pings when towing heavy on hot days with 92 going up hill) I've just got around to figuring why I can't run on the low octane stuff. From the looks of things previous owner liked to tinker. So who knows what he did. Pulling the plug (or one very similar) to the one you mentioned shuts down the truck in my case. Probably as a result of mine being OBDII (1996). I'll just run it down to the local mechanic here and have him pull the codes, that should tell the story.
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My '91 EFI 460 behaves the same way as far as the pinging. My mechanic recently did a thorough tune up and set the timing at 10 degrees. When I told him it still pings under load or in hot weather he suggested switching to a cooler plug. I haven't done this yet because I wanted to get some feedback on whether this will make a difference. Anybody have an opinion on this?
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From: Montana
My truck used to ping when on 87 octane everyonce in a while, at 10 degrees. Now with the mods I have done it will not ping when empty on 87 and only pings with a large trailer load when lugging the motor and this is with 12 degrees timing, I still run premium when towing though just to be safe. It seems like every truck is different. We didn't have a pinging problem ever with 87 octane on our 1992 460.
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Freshman User
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From: Chehalis WA
Thanks for the help so far, but let me restate my first question. Anyone know how to check to see what the timing is on an OBDII equiped 460? Unfortunately, 96-97 would be the only ones like this. I'd like to know if I'm at 10 degrees or 12 degrees or whatever. I'm interested in knowing what to disconnect (if there is anything you can) to get a "baseline" reading. (Everything I've tried so far just shuts off the motor) I'm used to the old school disconnect and plug the vaccuum advance hose....haha. Just throwing a light on it at idle shows somewhere above 20 degrees. How do I stop the computer from advancing the timing while adjusting the distributor position???
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From: Nevada
There a list out there that focuses on specifics of the various engine management systems. I've seen it mentioned on another Ford list, but don't recall the name or addtess. I'll ask around, maybe others can do the same on tech lists they follow.
Have you asked your question in the 1987-1996 F-series forum?
Have you asked your question in the 1987-1996 F-series forum?
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From: Angleton Tx.
Well I did the timing and advanced it to 12* and it had serious valve clatter. I put it back to 10* and it still has the valve clatter but not as bad. I had a check engine light the other day. It will come on and go off for awhile. I need to have the codes checked and see it there is not another problem. Other than that, it runs great.
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