Low power / engine misfiring
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Joined: Oct 2012
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Low power / engine misfiring
Guys I'm trying to narrow down the problem with the 460 engine in my 1966 Ford F250. The engine backfiring through the carb and quit. We discovered the bolt in the bottom of the distributor had come out and caused the problem. After repairing that the engine has low power when towing and misses some. It also seems to pop and backfire during deceleration. This engine was running great until this backfire through the carb. Any suggestions on why engine now has such low power towing and still missed? Any help would be appreciated. Thanks!
Tuned
Joined: Jan 2014
Posts: 340
Likes: 21
From: Weaverville NC
low power/missing
Hi pm, Sounds like the timing is off. I have a 240 cid 6 in my '65F-100. I think if I had your truck: I would put the #1 cyl. on tdc ( using the timing marks on the crankshaft damper) I'd take the distributor out of Ur motor. Next I'd point the rotor to the #1 spot of the cap ( not knowing a V-8's firing order ) I would think #1 to be the first cyl. to fire. Now with the rotor pointed to the proper cylinder--- put the dist. back in the motor. U will "feel" the gears either mesh or you will have to turn the rotor just a little so the dist. gear is " captured" by its mate. Now put the dist. hold down pc. and bolt back. Next comes setting the points with Ur feller gauges. With the points set... tighten the hold down bolt. This should fixer up!!! Hope this helps, Cheers, Pete
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Does sound like a timing or vacuum issue. Had similar issue w/ 390 where the exhause would not blow out a candle. Found timing was off, made mistake of pulling carb vac. off primary source rather than secondary?? I would probably start by removing #1 plug and w/ ign off turn the engine over until the compression stroke, I use the finger in the plug opening and when forced out immediately stop and check location of rotor to timing mark. I then close idle mixture screws gently then back out approx. 1 1/2 turns. Remove the fuel bowl site screw on the fuel bowl and fuel lever should be at the bottom of the threads on site opening. Type of carburetor, does it work off primary of secondary vac., if primary, is the vac. advance disconnected/plugged when setting the timing. Only use this method, if able to keep the engine running, as a reference point and adjust and/or find tune accordingly.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Turn the distributor clockwise. The idle will increase in RPM, to a point, then start to wander and stumble. Back off till it smooths out nicely. That will be plenty close till you can put a light on it.
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Thread Starter
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Senior User
Joined: Oct 2012
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I think I need to get a timing light on it to get it totally correct. It has a edelbrock carb and I think it suffered some damage from the backfire. The slight hesitation when accelerating seems to be a carb issue.
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