knocking while accelerating
New User
Joined: Jan 2003
Posts: 8
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From: USA
knocking while accelerating
Hi. My 79 F100 (automatic) started making a knocking noise today as I accelerated -- and the knocking increased and decreased by how much I accelerated or left off the gas. I can't tell for sure if its coming from the front end or the back end. What could this be and is it a big (costly or important to the overall functioning) problem?
Thanks.
elaria
Thanks.
elaria
Posting Guru
Joined: Aug 2002
Posts: 1,729
Likes: 2
knocking while accelerating
>Hi. My 79 F100 (automatic) started making a knocking noise
>today as I accelerated -- and the knocking increased and
>decreased by how much I accelerated or left off the gas. I
>can't tell for sure if its coming from the front end or the
>back end. What could this be and is it a big (costly or
>important to the overall functioning) problem?
>
>Thanks.
>elaria
Is it a dull knock, loud knock?? Sounds like it may be a rod or main bearing. Go over your engine well and see where it is coming from. Which engine do you have? Miles? well maintained, beaten, etc..
79 250 Ranger Lariat 4wd 400 C6 3.55's 33x12.50 16.5's
78 Bronco Custom 4wd 400 C-6 3.50's 31 10.5 15's
66 Mustang Coupe Sports sprint 200 c-4 cruise o matic 3.00's
99 Grand Prix GT 230 ft/lbs torque out of a non turbo'd 6 cyl hehe
>today as I accelerated -- and the knocking increased and
>decreased by how much I accelerated or left off the gas. I
>can't tell for sure if its coming from the front end or the
>back end. What could this be and is it a big (costly or
>important to the overall functioning) problem?
>
>Thanks.
>elaria
Is it a dull knock, loud knock?? Sounds like it may be a rod or main bearing. Go over your engine well and see where it is coming from. Which engine do you have? Miles? well maintained, beaten, etc..
79 250 Ranger Lariat 4wd 400 C6 3.55's 33x12.50 16.5's
78 Bronco Custom 4wd 400 C-6 3.50's 31 10.5 15's
66 Mustang Coupe Sports sprint 200 c-4 cruise o matic 3.00's
99 Grand Prix GT 230 ft/lbs torque out of a non turbo'd 6 cyl hehe
New User
Joined: Jan 2003
Posts: 8
Likes: 0
From: USA
knocking while accelerating
Its a dull knock, the exhaust basically drowns it out. Its a 302 engine and I don't know anything else about it (didn't inquire to the previous owner much about anything I'm afraid).
Senior User
Joined: Sep 2001
Posts: 118
Likes: 0
From: Bothell USA
knocking while accelerating
Is it Knocking or pinging? If its pinging try runing a higher octane gas if its knocking the its probally a main berring taking a crap.
Fun:1979 F-150 4x4 351M C-6 NP205
Commuter:2001 Ranger XL
And for the mud:1985 Toyota 4x4 with a 1973 302 C-4 NP205 Dana 44 in front and rear.
Fun:1979 F-150 4x4 351M C-6 NP205
Commuter:2001 Ranger XL
And for the mud:1985 Toyota 4x4 with a 1973 302 C-4 NP205 Dana 44 in front and rear.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
knocking while accelerating
-going south
-going west
-blowing out
-go boom
-go bang
-bad, ruined, worn out, no good... hehe
Bad news for an engine, -rebuild/replace time. You may want to get a professional mechanic to take a look at it to be sure.
Thanks for using FTE!
[font color=red]As a Moderator I do not "Subscribe" to most topics,
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-
-going west
-blowing out
-go boom
-go bang
-bad, ruined, worn out, no good... hehe
Bad news for an engine, -rebuild/replace time. You may want to get a professional mechanic to take a look at it to be sure.
Thanks for using FTE!
[font color=red]As a Moderator I do not "Subscribe" to most topics,
please send email/pm if you need a reply -Thanks![/font]
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Senior User
Joined: Jan 2003
Posts: 386
Likes: 0
From: usa
knocking while accelerating
Well let me ask this? Did you fill up with gas right before it started knocking/pinging? If so you got some bad Go Juice and or the timing is just a tad to high for the octane of the fuel you just bought.
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Senior User
Joined: Aug 2002
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From: south dakota
knocking while accelerating
if you are still unsure where the noise is coming from, the first priority would be to narrow it down. "knocks when you accelerate" so does it knock if you are sitting still and just rev the engine a little? you may just have a bad U-joint in the driveline.
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