Bad ignition and knocks, are they related??

[Stez]

If i have some problem with my ignition system (wires, coils or plugs), can it provide a lot of knocks under loads??

 

[pneumo]

Yes, if the motor has misfires it can cause knock.

 

[OverboostXS]

Most likely not, but possible shouldn't be dangerous knock tho (what problems are you expierencing with your ignition).

 

[Stez]

Most likely not, but possible shouldn't be dangerous knock tho (what problems are you expierencing with your ignition).

well, according to O2 voltage i have lots of misfiring at idle, but during hard load there is no misfire but there are a lot of knocks (O2 - around 0.8), i'm adding fuel to reach the mixture and receiving misfires already somethere at 5k....

 

[pneumo]

I'd suggest you fix the ignition. You know it's bad already, it can only help.

A rich (reach) mixture is harder to ignite. If you lean it out the misfires might go away, but then you're too lean to prevent knock.

 

[Stez]

I'd suggest you fix the ignition. You know it's bad already, it can only help.

A rich (reach) mixture is harder to ignite. If you lean it out the misfires might go away, but then you're too lean to prevent knock.

Yes, this exactly the situation i have! when the mixture is lean - there is no misfire (on load) but im getting knocks... but when im starting adding fuel and its getting more rich - the misfires appear! so the problem is in the ignition system i guess, the only thing i need to do is to define what exactly is my problem - wires, coils or plugs (probably plugs ok, since i changed it to new ngk7bpr and nothing change) so it sould be wires or coils... I was considering about COP setup to eliminate both... how do you think?

 

[aero_sallee]

Yes, this exactly the situation i have! when the mixture is lean - there is no misfire (on load) but im getting knocks... but when im starting adding fuel and its getting more rich - the misfires appear! so the problem is in the ignition system i guess, the only thing i need to do is to define what exactly is my problem - wires, coils or plugs (probably plugs ok, since i changed it to new ngk7bpr and nothing change) so it sould be wires or coils... I was considering about COP setup to eliminate both... how do you think?

What gap did you set the plugs to? Make sure they are gapped to 0.028. After that try wires, its much cheaper and more likely to be your problem than coils. I've had misgapped plugs cause exactly what you are describing.

 

[Stez]

What gap did you set the plugs to? Make sure they are gapped to 0.028. After that try wires, its much cheaper and more likely to be your problem than coils. I've had misgapped plugs cause exactly what you are describing.

my plugs gaped to 0,7 mm - this is approximately 0.028" so it sould not be plugs, can i check the wires in some way? or it can be only changed?