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Mar 28, 2002 | 11:41 AM

fordzrule

Thread Starter

Mountain Pass

Joined: Jan 2001

Posts: 130

Likes: 0

From: Ozark Arkansas

knock

my 84 f150 351w is knocking it wont do it all the time. it kinda sounds like a diesel tractor when you shoot the ether to it. it usually does it from around 10-20 mph. it is kinda making me wonder anyone have any ideas

Mar 28, 2002 | 05:41 PM

Wilber15

Elder User

Joined: Nov 2001

Posts: 892

Likes: 1

From: Duluth, MN

knock

If it ain't broke.....change stuff till it is!

It could just be noisy injectors. I've heard of injectors making a nocking noise, which many people mistake for other problems.

Mar 28, 2002 | 06:10 PM

fordzrule

Thread Starter

Mountain Pass

Joined: Jan 2001

Posts: 130

Likes: 0

From: Ozark Arkansas

knock

its carburated . so it cant be an injector

Mar 28, 2002 | 07:12 PM

TorqueKing

Posting Guru

Joined: Feb 2002

Posts: 1,712

Likes: 1

From: Atlanta, Georgia, USA

knock

Might be a noisy lifter, unless you have roller lifters, which I guess you do if that's a post '83 302, nevermind

Mar 28, 2002 | 08:28 PM

PigFarmer

Senior User

Joined: Mar 2002

Posts: 450

Likes: 0

From: Charter Oak, Iowa

knock

If you hear it when the engine is unloaded (not pressing or releasing on the accelerator as you are moving down the road) it could be rod or main bearings. Mine made a knocking noise as you describe but at higher speeds than yours. Upon overhaul all bearings were toast. Hope this isn't the case for you but an idea.

Randy

Mar 29, 2002 | 07:44 AM

fordzrule

Thread Starter

Mountain Pass

Joined: Jan 2001

Posts: 130

Likes: 0

From: Ozark Arkansas

knock

the engine ususally has a load on it most of the time it is going up a hill or taking off

Mar 29, 2002 | 08:44 AM

slikness

Posting Guru

Joined: Jun 1999

Posts: 1,100

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From: Durham

knock

Try retarding your timing a little, maybe 2-3 degrees. You could also try a tank full of higher octane gas and see if that resolves your problem. Both would indicate a problem with initial timing and maybe with the rate the distributor advances as you accelerate...