350 misfiring - help please
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CF Beginner
Joined: Aug 2021
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350 misfiring - help please
Hi all
I have a ‘49 3600 with a late 80’s 5.7 350 engine and three speed box. The engine has MSD distributor and leads and dense t20-tt plugs. The engine runs ok but a little lumpy when stationary. When I drive it above 30 mph I start to get a terrible vibration through the whole truck. I’ve had the wheels balanced and they are perfect. I’ve had the propshaft rebuilt and that’s perfect so it can only be the engine or the transmission. Ive changed the plugs and leads this weekend and there has been no change.
The vibration is awful when it starts so I’m now thinking it’s a severe missfire. I do find that when it happens, if I drop it into 2nd gear and Rev the nuts off it, it goes much smoother - could this be load related?
Any help much appreciated.
Anthony
Tamworth, England.
I have a ‘49 3600 with a late 80’s 5.7 350 engine and three speed box. The engine has MSD distributor and leads and dense t20-tt plugs. The engine runs ok but a little lumpy when stationary. When I drive it above 30 mph I start to get a terrible vibration through the whole truck. I’ve had the wheels balanced and they are perfect. I’ve had the propshaft rebuilt and that’s perfect so it can only be the engine or the transmission. Ive changed the plugs and leads this weekend and there has been no change.
The vibration is awful when it starts so I’m now thinking it’s a severe missfire. I do find that when it happens, if I drop it into 2nd gear and Rev the nuts off it, it goes much smoother - could this be load related?
Any help much appreciated.
Anthony
Tamworth, England.
CF Monarch
Joined: Jul 2011
Posts: 5,920
Likes: 140
From: kevinkpk
Hi all
I have a ‘49 3600 with a late 80’s 5.7 350 engine and three speed box. The engine has MSD distributor and leads and dense t20-tt plugs. The engine runs ok but a little lumpy when stationary. When I drive it above 30 mph I start to get a terrible vibration through the whole truck. I’ve had the wheels balanced and they are perfect. I’ve had the propshaft rebuilt and that’s perfect so it can only be the engine or the transmission. Ive changed the plugs and leads this weekend and there has been no change.
The vibration is awful when it starts so I’m now thinking it’s a severe missfire. I do find that when it happens, if I drop it into 2nd gear and Rev the nuts off it, it goes much smoother - could this be load related?
Any help much appreciated.
Anthony
Tamworth, England.
I have a ‘49 3600 with a late 80’s 5.7 350 engine and three speed box. The engine has MSD distributor and leads and dense t20-tt plugs. The engine runs ok but a little lumpy when stationary. When I drive it above 30 mph I start to get a terrible vibration through the whole truck. I’ve had the wheels balanced and they are perfect. I’ve had the propshaft rebuilt and that’s perfect so it can only be the engine or the transmission. Ive changed the plugs and leads this weekend and there has been no change.
The vibration is awful when it starts so I’m now thinking it’s a severe missfire. I do find that when it happens, if I drop it into 2nd gear and Rev the nuts off it, it goes much smoother - could this be load related?
Any help much appreciated.
Anthony
Tamworth, England.
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Alex Hunter
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Dec 11, 2017 8:53 PM