TexJJ

Can anyone tell me the purpose of the Ignition Noise Filter? On my 3.0 it is located just next to the coil/igniter assembly with a ground wire attached to the chassis. I am trying to track a very rare and intermittent problem with the engine causing it to jerk/stumble every couple of hundred miles for an instant. The engine seems to run with the noise filter plugged in or not. My dad seems to think the jerk is like a capacitor discharging since it is so spurratic but seems to occur at regular 300 mile intervals. We are at a real loss. It is a new rebuild and we have replaced the igniter and coil. The dizzy is within spec and I can't seem to find anything else that maybe the problem

This vehicle is to be used in an upcoming expedition to the interior of Mexico so I am trying to sure it up.

Thanks for any assistance.

JJ

wrenchmonster

A noise filter is used to limit the noise heard through your radio and also helps not to screw up someones TV signal as you drive by their house. I don't know how old you are, but you may remember driving and listening to an AM radio station and every time you accelerated you could hear noise on the radio. That's what a ignition noise filter diminishes.

This is different from old school rigs with capacitors. Capacitors were used to prevent arching across points type ignition systems.

TexJJ

Thanks wrench. So I doubt this little noise device could be the source of my problem. I am getting tired of the fun and expensive process of "just replace it" and see if it works!

JJ

Elvota

I had a loose ground at the coil on a 22RE one time. Was very sporadic, and hard to trace, but the engine would act like you describe on occasion. Got worse until I figured out the simple fix, sand and tighten the bolt.

Maybe check all your grounds... just a guess.

ScubaDuck

I had the same thing (loose coil connection) when I was in High School (not on a Toyota though). The wire appeared tight (my mechanic checked it repeatedly) but while driving the wire would disconnect and the engine would cut out. For me it wasnt at 300 miles, it was every Friday afternoon. My mechanic had my truck every weekend for six weeks trying to figure it out. Truck would run fine all week, till the next friday. (When my mechanic finally found the problem he didn't charge me for any of his work).

So like Elvota said - Double check all your wires, then check them all again.

Good luck-

-Scubaduck