Jcris
Chief Petty Officer
- Joined
- Apr 23, 2016
- Messages
- 466
Hello,
I've got a 1996 4.3 LX Gen+ Mercruiser. It's a Thunderbolt 5 ignition with a 2 barrel carb. I recently replaced the plugs, cap , rotor. Also replaced fuel/water separator and inline fuel filter. I set timing to 10 degrees BTDC at 650 rpm's while grounding the timing lead. After the tune up work I also installed a momentary switch on the fuel pump. Did that to allow manual priming of fuel bowl. After the fuel system work and momentary switch install I used the switch to prime the bowl and check for fuel leaks. No leaks so I started the engine. I did use you a good quality timing light but found the timing to be rather erratic at idle. By that I mean the timing mark seemed to float between about 8 -12 degrees. Could this be an amplifier issue? If so, how can I check it? I've checked the forums and wanted to post here.
I've got a 1996 4.3 LX Gen+ Mercruiser. It's a Thunderbolt 5 ignition with a 2 barrel carb. I recently replaced the plugs, cap , rotor. Also replaced fuel/water separator and inline fuel filter. I set timing to 10 degrees BTDC at 650 rpm's while grounding the timing lead. After the tune up work I also installed a momentary switch on the fuel pump. Did that to allow manual priming of fuel bowl. After the fuel system work and momentary switch install I used the switch to prime the bowl and check for fuel leaks. No leaks so I started the engine. I did use you a good quality timing light but found the timing to be rather erratic at idle. By that I mean the timing mark seemed to float between about 8 -12 degrees. Could this be an amplifier issue? If so, how can I check it? I've checked the forums and wanted to post here.
