The Micro switch next to the throttle ,has a filter capacitor.

Printable View

03-07-2016, 10:02 AM
norcimo

The Micro switch next to the throttle ,has a filter capacitor.

The Micro switch next to the throttle ,has a filter cap across.

can someone tell me whats the purposes of this filter?

when removed, the idle is great...but when its connected... get I the idle hunt...sometimes..

and cold start issues too..
03-07-2016, 10:41 AM
Bitsyncmaster

It should have no effect on idle unless it's a shorted capacitor. It's to reduce the noise caused by turning the power off to the advance solenoid. Without the cap, I got a glitch of the RPM relay priming just by hitting the throttle with the engine off.
03-07-2016, 10:53 AM
norcimo

Quote:

Originally Posted by Bitsyncmaster

It should have no effect on idle unless it's a shorted capacitor. It's to reduce the noise caused by turning the power off to the advance solenoid. Without the cap, I got a glitch of the RPM relay priming just by hitting the throttle with the engine off.

Well that explains it.

It was shorted out... I have to find a replacement....what's the value? Cant read it off it...
03-07-2016, 11:01 AM
Bitsyncmaster

Quote:

Originally Posted by norcimo

Well that explains it.

It was shorted out... I have to find a replacement....what's the value? Cant read it off it...

It's probably a 1 uf or less. Lots of cars never got the cap so it's not critical you even have it.
03-07-2016, 11:05 AM
norcimo

Quote:

Originally Posted by Bitsyncmaster

It's probably a 1 uf or less. Lots of cars never got the cap so it's not critical you even have it.

I have to replace it, my electrical is going crazy.
everytime I hit the brakes, the TAC jumps and sometimes the internal lights come up... or if I flash the lights.. same thing.
though its shorted, the it still filters out... so head to the auto shop and getting an inline DC noise filter.

Thanks.
03-07-2016, 11:35 AM
Bitsyncmaster

Quote:

Originally Posted by norcimo

I have to replace it, my electrical is going crazy.
everytime I hit the brakes, the TAC jumps and sometimes the internal lights come up... or if I flash the lights.. same thing.
though its shorted, the it still filters out... so head to the auto shop and getting an inline DC noise filter.

Thanks.

I had noise problems when the AC compressor switched off. I put a scope on it and saw >200 volt negative spike. A zener diode attached near the compressor clutch fixed that problem.

FYI:
When an inductor (anything with a coil of wire) is depowered, the magnetic field collapses and induces a voltage usually negative. So that induced voltage drives noise in the ground and can upset electronics.
03-07-2016, 12:49 PM
DMCMW Dave

Quote:

Originally Posted by norcimo

I have to replace it, my electrical is going crazy.
everytime I hit the brakes, the TAC jumps and sometimes the internal lights come up... or if I flash the lights.. same thing.
though its shorted, the it still filters out... so head to the auto shop and getting an inline DC noise filter.

Thanks.

That's not from a simple suppression cap. You have another problem, most likely a corroded ground connection or a bad connection at one of the bulkhead colored plugs. Or both.
04-11-2016, 09:48 PM
norcimo

Quote:

Originally Posted by DMCMW Dave

That's not from a simple suppression cap. You have another problem, most likely a corroded ground connection or a bad connection at one of the bulkhead colored plugs. Or both.

Well, I put it back and the problem went away..its been like that for weeks now...works.