Help new engine has a miss in the 3800-5000rpm range
06-01-2010, 04:38 PM
#1
Help new engine has a miss in the 3800-5000rpm range
Any ideas? this is driving me nuts.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
06-02-2010, 09:40 PM
#3
Registered
Join Date: Dec 2007
Location: Detroit River/ lake Erie
Posts: 782
Likes: 0
Received 0 Likes
on
0 Posts
Any ideas? this is driving me nuts.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
http://www.performancedistributors.com/marinedui.htm
06-02-2010, 09:44 PM
#4
Registered
Join Date: Dec 2007
Location: Detroit River/ lake Erie
Posts: 782
Likes: 0
Received 0 Likes
on
0 Posts
Any ideas? this is driving me nuts.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
This is a new/ rebuilt 547 N/A engine. Has a thunderbolt 4 ignition.
Had it on a dyno and no issues, soon as it went in the boat has miss. Maybe because it was not held in that rpm range it was never noticed on the dyno.
Takes a rev fine.
When im running a constant rpm between 3800 and 5000 you can hear a constant slight miss. 5000-5600 nothing, unless its just not as noticible.
Has a thunderbolt 4 ignition
There is new wires, cap and rotor.
Checked the plugs, they look fine.
Checked all my connections at distributer and coil and module.
Checked rotor and cap and spark plug wire connections.
Im thinking of swapping out coil( thought coils were good or bad) and module next. Then Carb I guess. Fuel pressure is good at idle, not sure when running.
Carb was just rebuilt by engine builder.
Charter Member
