Spark knock?
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Junior User
Joined: Nov 2005
Posts: 60
Likes: 0
From: Marshville NC
Spark knock?
My truck is a 1971 f-100 with a 302 2bbl, 3 on the column. It is all stock with 89000 mls. Motor was rebuilt about 48000 because my Grandfather and my dad babied the thing to death.
My question is when I'm running about 50mph in traffic at about 1900 to 2000 rpms and traffic picks up the pace, when I press down she rattles, spark knocks
I've got my timing set good and points are right. What else is there?
My question is when I'm running about 50mph in traffic at about 1900 to 2000 rpms and traffic picks up the pace, when I press down she rattles, spark knocks
I've got my timing set good and points are right. What else is there?
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Always buy fuel from a busy service station/gas bar to insure the gasoline is fresh and un-contaminated from weather change.
These trucks were born when regular gasoline had an octane rating of 90-91
Regular these days is what ....86-87 octane ?
These trucks were born when regular gasoline had an octane rating of 90-91
Regular these days is what ....86-87 octane ?
Last edited by Mil1ion; Dec 30, 2006 at 08:27 PM.
Freshman User
Joined: Nov 2006
Posts: 26
Likes: 0
From: Berkshire
Had the same problem with a 68 390. Retarded the timing so far to get rid of spark knock, had no power. I ran the distributor vaccum directly to manifold vaccum. Cured the problem and I could run the timing right up to 10 to 12 degrees if I wanted.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Now that's a band aid fix because of another
fault that hasn't been corrected.
Been beat to death on other threads, I pass.
fault that hasn't been corrected.
Been beat to death on other threads, I pass.
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Originally Posted by fordtks
Beemer Nut, Call it what you want. Did this revision 20 years ago for a friend and its still working. Truck runs everyday.
John
