460 missing, need help
Freshman User
Joined: Jan 2001
Posts: 29
Likes: 0
460 missing, need help
My 460 has as miss on the passengers side only and I can't figure it out. Here's what I have done so far.
New componants installed.
1. Edelbrock 750cfm performer carb.
2. Stock distributor.
3. Stock coil.
4. Plug wires.
5. Spark plugs.
6. Ignition module.
7. Distributor cap and rotor.
Compression check was as follows in cylinder number order; 140, 136, 140, 145, 140, 122, 134, 135. I put about a tablespoon or so of oil in # six cylinder that read 122psi. and the compression was still 122psi.
I connected a timing light to each cylinders spark plug wire and could not visually see any misfiring.
I don't notice the miss under heavy acceleration but I could be wrong about that. I've been use to my tired ol 400 that was in there and I'm running flowmaster 2 chambers so things are a lot differant for me now.
I read 5.8 volts on the coil and when I disconnect the leads from the coil I read 11 volts on the wires. Is that normal? The coil reads 1.4 ohms accross the primary and 9Kv across the secondary so I'm sure the coil is good.
I have knew ground cables to the engine block, chassis and I ran a knew ground to the ignition module.
Any help will be appreciated.
New componants installed.
1. Edelbrock 750cfm performer carb.
2. Stock distributor.
3. Stock coil.
4. Plug wires.
5. Spark plugs.
6. Ignition module.
7. Distributor cap and rotor.
Compression check was as follows in cylinder number order; 140, 136, 140, 145, 140, 122, 134, 135. I put about a tablespoon or so of oil in # six cylinder that read 122psi. and the compression was still 122psi.
I connected a timing light to each cylinders spark plug wire and could not visually see any misfiring.
I don't notice the miss under heavy acceleration but I could be wrong about that. I've been use to my tired ol 400 that was in there and I'm running flowmaster 2 chambers so things are a lot differant for me now.
I read 5.8 volts on the coil and when I disconnect the leads from the coil I read 11 volts on the wires. Is that normal? The coil reads 1.4 ohms accross the primary and 9Kv across the secondary so I'm sure the coil is good.
I have knew ground cables to the engine block, chassis and I ran a knew ground to the ignition module.
Any help will be appreciated.
Senior User
Joined: Dec 2001
Posts: 143
Likes: 0
460 missing, need help
well i would check for a vacuum leak that feeds that side of the miss. Such as a intake leak at the cylinder port. If the miss is under load, you might want to check for a broken valve spring, or possible flat cam. This is of course knowing that yor ignition system is in top shape..
