Ricky_rich
Petty Officer 2nd Class
Thread starter- Joined
- Mar 4, 2014
- Messages
- 152
Volvo Penta 5,7GL PLKR
Holley two port carburettor.
Pertronix ignition module
Pertronix high voltage ignition coil.
I’m having some problems here. One spark plug is getting a lot of soot on it. (Cylinder no 2.) And after a couple of hours, it’s not giving any spark. If I put a new plug in engine runs fine again. A few years ago I could run a whole summer on a set of spark plugs, now I'm down to a few hours. So what ever it is, it's getting worse.
Sometimes when accelerating I hear a BOFF sound, like if the air/gas mixture was ignited in the intake or the exhaust.
I thought it could be a bad valve so I did a cylinder leak test. Cylinder 2 have about 5% leak, mostly down past the piston from what I can hear. I did the test on a couple of other cylinders and the all show about the same leak %. Also reset the preload on the valve/lifter, but it didn't make any difference.
Holley two port carburettor.
Pertronix ignition module
Pertronix high voltage ignition coil.
I’m having some problems here. One spark plug is getting a lot of soot on it. (Cylinder no 2.) And after a couple of hours, it’s not giving any spark. If I put a new plug in engine runs fine again. A few years ago I could run a whole summer on a set of spark plugs, now I'm down to a few hours. So what ever it is, it's getting worse.
Sometimes when accelerating I hear a BOFF sound, like if the air/gas mixture was ignited in the intake or the exhaust.
I thought it could be a bad valve so I did a cylinder leak test. Cylinder 2 have about 5% leak, mostly down past the piston from what I can hear. I did the test on a couple of other cylinders and the all show about the same leak %. Also reset the preload on the valve/lifter, but it didn't make any difference.
