no spark on #2 wile reving

[Eleanor_cb7]

https://www.youtube.com/watch?v=X6ig...e_gdata_player i have spark at idle but when i rev it it has no spark. New plugs and wires. Can it be the coil? The cap looks good and the rotor also looks good.

[illinois_erik]

https://www.youtube.com/watch?v=X6ig...e_gdata_player i have spark at idle but when i rev it it has no spark. New plugs and wires. Can it be the coil? The cap looks good and the rotor also looks good.

sounds like the coils dying to me.

[sonikaccord]

Unless you have individual coils, the coil in our stock system supplies spark to ALL the plugs through the HT wire. It's then distributed to the plugs. The cap and rotor may "look" fine visibly but have poor conductivity. Swap them out anyway.

[illinois_erik]

im going off the notion that a failing coil will be able to charge and discharge at idle, but once the frequency increases you will have misfires, if after cleaning the rotor and contacts with some fine sand paper, and testing the plug leads with an ohm meter, then the coil will be faulty.

[Eleanor_cb7]

Ok thanks. The problem accrues with the new wires and the old ones. So new cap and rotor. Then coil if it isn't fixed.

[sonikaccord]

im going off the notion that a failing coil will be able to charge and discharge at idle, but once the frequency increases you will have misfires, if after cleaning the rotor and contacts with some fine sand paper, and testing the plug leads with an ohm meter, then the coil will be faulty.

Wait...do our cars put out higher voltage as the rpm's increase? You just sparked an interest, I'm going to go do some research.

[ahdiofreak]

Wait...do our cars put out higher voltage as the rpm's increase? You just sparked an interest, I'm going to go do some research.

Any car should put out a higher voltage as rpm's increase. Because the alternator is spinning faster. Unless if the voltage regulator in the car controls the voltage to be steady.

[illinois_erik]

Wait...do our cars put out higher voltage as the rpm's increase? You just sparked an interest, I'm going to go do some research.

i dont know about higher voltage, but the duty cycle would increase and a shot coil wouldn't be able to saturate and discharge as fast.

Any car should put out a higher voltage as rpm's increase. Because the alternator is spinning faster. Unless if the voltage regulator in the car controls the voltage to be steady.

what? the alternator for our cb's will put out the same voltage if its idle or redlined, amperage is a different story..and has nothing to do with ignition, besides providing power to the ignition circuit and rest of the car.

[sonikaccord]

Any car should put out a higher voltage as rpm's increase. Because the alternator is spinning faster. Unless if the voltage regulator in the car controls the voltage to be steady.

I meant specifically for the coil in the ignition circuit.

i dont know about higher voltage, but the duty cycle would increase and a shot coil wouldn't be able to saturate and discharge as fast.

If the primary coil duty cycle increases, then the secondary voltage would be higher. I haven't found any waveforms of the ignition circuit, but if it uses PWM like the fuel injectors I would be surprised. That would mean a hotter spark at higher rpms. I haven't seen any options in any tuning software either...

[illinois_erik]

If the primary coil duty cycle increases, then the secondary voltage would be higher. I haven't found any waveforms of the ignition circuit, but if it uses PWM like the fuel injectors I would be surprised. That would mean a hotter spark at higher rpms. I haven't seen any options in any tuning software either...

I was looking at it from a regular distributor set up, where your revs are the "pwm" signal..but im green to this area, so i read a bit and Im probably way off.


"How Does the 92-01 Honda Accord, Prelude,
Igniter (Ignition Control Module) Work?
In a nutshell and when the Honda ignition system is working properly; when you turn the key to crank and start your Honda:
12 Volts are fed first to the ignition coil (when you turn the key to ON and then Crank), and from the Coil to the igniter (ignition control module) inside of the distributor.
The distributor shaft starts to turn (as the engine cranks and starts) which induces the Position Sensors to start producing and sending their Position Signals to the ECM (Electronic Control Module=Fuel Injection Computer).
Upon receiving these position signals, the ECM sends a Triggering Signal to pulse the igniter.
The igniter upon receiving this Triggering Signal in turn sends a Switching Signal to the ignition coil.
The ignition coil, upon receiving this Switching Signal, starts to spark away!
The Switching Signal is just the ‘switching’ On and Off of the primary current flowing thru' the Coil by interrupting its path to ground.
The primary current is just the name for the 12 Volts that the ignition coil receives.
The ECM controls the igniter at Start Up and at all engine speeds after Start Up, unlike the majority of distributor-type ignition systems where the ignition control module freelances at Start Up."

http://easyautodiagnostics.com/honda...nostic-tests-1

Looks like it could be more than just the easy, rotor, cap, leads and coil..so if i was int he same boat id give that article a once over and try that way.


I just know from HV experiments, when a coil starts going bad it wont create sparks at certain frequencies, so I applied that to the motor revving, since theres spark at idle (low duty) and none on a particular (random?) cylinder with increased revs(higher duty), the coil could be going out.

[sonikaccord]

Gotcha. You're referring to the mechanical duty cycle.

If the coil was going out I'd think he'd have multiple and random misfires on random cylinders, but he says it's only on number #2.

[Eleanor_cb7]

So i found out what is was. Oil leaking into the dizzy and causing the miss.