Swedefj40
Petty Officer 1st Class
- Joined
- Jun 9, 2018
- Messages
- 224
Can someone explain to me why I'm getting a hyper spark or ignition pulse on #1 & #6 wires coming off the distributer? I have a 1996 4.3LX A1G2 with thunderbolt 4 ignition.
What I mean is, I clamped my timing light to #1 wire and at idle 700 RPM (tach reading), it shows 900+ RPM with the timing light. #2, 3, 4, & 5 wires show the correct 670 (ish) RPM with the light, but #6 is showing 2000 to 3000 RPM!!! The engine is running fine but I'm really curious as to why the higher pulse numbers on #1 & #6 wires? The plug wires are only a few years old. As is the cap and rotor. Is it possible the light is picking up the pulse from the adjacent wires?
Any ideas?
What I mean is, I clamped my timing light to #1 wire and at idle 700 RPM (tach reading), it shows 900+ RPM with the timing light. #2, 3, 4, & 5 wires show the correct 670 (ish) RPM with the light, but #6 is showing 2000 to 3000 RPM!!! The engine is running fine but I'm really curious as to why the higher pulse numbers on #1 & #6 wires? The plug wires are only a few years old. As is the cap and rotor. Is it possible the light is picking up the pulse from the adjacent wires?
Any ideas?