Tim Kay
Lifetime Supporter
And it's driving me bonkers! Best described it sounds uniquely similar to a loud spark plug arc, what you hear when holding a spark plug to ground while the motor turns over.
It only occurs at low throttle position. Either with an abrupt throttle blip while idling or while cruising then stabbing the throttle creating a significant load. Generally I will only hear one click on occasion two and I can repeat it on demand, hot or cold, any gear. It won't occur if throttle position is more than 20-25%. Again, it seems to be throttle position and load sensitive. The sound comes from only one area which is on the passenger side of the motor.
Initially I thought it was a valve spring or loose rocker arm and then explored the possibility of it being exhaust escaping through an intake valve and up into the throttle body. I've had the heads off and checked springs, valves and rocker arm assembly and everything is good there.
The dizzy cap and rotor are new. Next thing I'm going to try is replacing all the spark spark plug wires.
Any ideas?
Tm
It only occurs at low throttle position. Either with an abrupt throttle blip while idling or while cruising then stabbing the throttle creating a significant load. Generally I will only hear one click on occasion two and I can repeat it on demand, hot or cold, any gear. It won't occur if throttle position is more than 20-25%. Again, it seems to be throttle position and load sensitive. The sound comes from only one area which is on the passenger side of the motor.
Initially I thought it was a valve spring or loose rocker arm and then explored the possibility of it being exhaust escaping through an intake valve and up into the throttle body. I've had the heads off and checked springs, valves and rocker arm assembly and everything is good there.
The dizzy cap and rotor are new. Next thing I'm going to try is replacing all the spark spark plug wires.
Any ideas?
Tm