352 timing
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Joined: Mar 2003
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352 timing
I've had problems with my 352 backfiring through the carb upon hard acceleration. I Backed the timing off from several degrees BTDC to 0 degrees BTDC. Now it has started to run rough at idle and stumble but not backfire under acceleration, and I think the timing could be involved. The plugs seem good and the air-cleaner is only slightly dirty. What timing are ya'll running and what do you suggest i check or adjust it too.
Nathan
Nathan
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
352 timing
You should be closer to 6-12 BTDC. Some of us run even higher with hot ignition setups or upgrade cams.
Get the timing back up to 8 or 10 and start looking for Carb problems.
Is this a recent problem. If so, did it happen suddenly? If so, your timing chain may have slipped. Otherwise, stick to the carb investigating.
Get the timing back up to 8 or 10 and start looking for Carb problems.
Is this a recent problem. If so, did it happen suddenly? If so, your timing chain may have slipped. Otherwise, stick to the carb investigating.
Last edited by gtex; May 4, 2003 at 09:59 PM.
Logistics Pro
Joined: Feb 2000
Posts: 3,565
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From: Sun River St. George
352 timing
Are you using points? Or aftermarket electronic? Did this problem begin one day while you were happily motoring along or after you made some adjustments? I like initial timing at 12 degrees advanced. Of course you need good compression and a timing chain that is in good condition as well. A operating vacuum and centrifugal advance is also helpful. A crossed plug wire will cause this as well. Post back we want to know how this comes out. Oh yea, Dahn's law says "90% of poor running engines are caused by ignition problems".
Senior User
Joined: May 2003
Posts: 333
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From: South Dakota
352 timing
I think ill add my two cents and say that ive had this problem with my 66 f100 352. maybe youve gotten this problem fixed but what i did was replaced the power valve on the bottom of my carb and that curred it right up but later i swapped to a new Holley 500 cfm 2 bbl carb. And I havnt had any problems with it since, I also never messed with the timing, but due to recent problems i wish i could see the timing marks on the balancer.
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