missing during normal take off
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Joined: Jul 2003
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missing during normal take off
My truck is a 78 f 100 with a 351 m, Edelbrock 4v, auto transmission,NEW PLUG WIRES, SPARK PLUGS .035 GAP?,ROTARY BUTTON AND DISTRIBUTOR CAP.
During take off, it misses but does fine after it shifts out.
the shaft in the distributor has play side to side.
IT WAS RUNNING LIKE THIS BEFORE I PUT THESE PARTS ON IT AND THEY DID'NT HELP.
I pulled the line off the vacuum advance and it runs a little smoother but it seems to have lost some power.
IS MY DISTRIBUTOR BAD?
Can anyone help me with this problem?
THANKS, KLANG
During take off, it misses but does fine after it shifts out.
the shaft in the distributor has play side to side.
IT WAS RUNNING LIKE THIS BEFORE I PUT THESE PARTS ON IT AND THEY DID'NT HELP.
I pulled the line off the vacuum advance and it runs a little smoother but it seems to have lost some power.
IS MY DISTRIBUTOR BAD?
Can anyone help me with this problem?
THANKS, KLANG
Last edited by Klang; Jul 18, 2003 at 09:19 AM.
Posting Guru
Joined: Jul 2001
Posts: 1,613
Likes: 2
From: Gainesville, FL
missing during normal take off
Klang,
You are describing a lean fuel condition usually caused by a bad accelorator pump. Rebuild your carb, or at least, the accelerator pump. Max out the linkage if you have mutiple points to choose and see if it doesn't take care of that nasty cough.
EDIT:
Secondly,
Your timing may be off. Too far advanced.
KingFisher
You are describing a lean fuel condition usually caused by a bad accelorator pump. Rebuild your carb, or at least, the accelerator pump. Max out the linkage if you have mutiple points to choose and see if it doesn't take care of that nasty cough.
EDIT:
Secondly,
Your timing may be off. Too far advanced.
KingFisher
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
missing during normal take off
Your distributor must have a very small amount of play in order to operate but it is almost undetectable. If you have noticeable play your distributor is probably worn out. This play and the motion of the vac advance will cause the pickup module to miss sending out a signal or send it at the wrong time which can cause a miss that would be worse under acceleration. Get a new distributor which will also have a new pickup module in it.
Get your fender mounted ignition module tested when you go to the store for a new distributor. If you need a new ignition module only get a Motorcraft replacement module even if they try to sell you some other lifetime guarantee unit. You will be replacing other brands of aftermarket modules annually and they will give you fits and bad gas mileage each time they fail. It is not worth the time and effort even with the guarantee. Mount the Motorcraft ignition module back on the fender with 1/4" spacers to allow cooling air under it.
You can get Motorcraft modules at Oreilley's and other stores, call around to locate one. The other brands are junk.
Get your fender mounted ignition module tested when you go to the store for a new distributor. If you need a new ignition module only get a Motorcraft replacement module even if they try to sell you some other lifetime guarantee unit. You will be replacing other brands of aftermarket modules annually and they will give you fits and bad gas mileage each time they fail. It is not worth the time and effort even with the guarantee. Mount the Motorcraft ignition module back on the fender with 1/4" spacers to allow cooling air under it.
You can get Motorcraft modules at Oreilley's and other stores, call around to locate one. The other brands are junk.
