noise filter purpose?

[twan]

im doing the wire harness for my 88 supra 2jz and i came across the igniter pack wiring. as the 12+ feeds each coil it goes to to a noise filter and then grounded.
i didnt get a noise filter in my harness but i was wondering what would happen if i didnt include it.
wiring schematics are:
http://www.97supraturbo.com/1997%20Service%20Manual/Electrical.pdf
scroll down to about 1/4 of the website to "starting and ignition" page 61

 

[hvyman]

2j harness or 7m harness? Which one are you using that is?

I didnt use it on my 1jz.

Its to keep the frequency of the electrical system from causing interference.

 

[bioskyline]

are u sure its not inside the loom? filter might be attached and tucked away in the loom like some of the commons.

 

[hvyman]

No there is one that is external and replaceable on the 7m harness. It bolts to like where the igniter is.

 

[twan]

nope def. not in the loom because i took every piece of electrical tape off.
is there a pic of the 7m noise filter?

---------- Post added at 11:29 PM ---------- Previous post was at 11:28 PM ----------

oh just saw the pic now. k thanks man!

 

[bioskyline]

oh ok thats what that does. i thought it was a condensor, or is it more or less the same idea?

 

[hvyman]

capictor or condensor stores electrical charge.

Noise filter is kinda like for static on a radio.

 

[IJ.]

capictor or condensor stores electrical charge.

Noise filter is kinda like for static on a radio.

Same same, it's just a cap.

There's another from memory in the a pillar near the fuse panel for the rear window demister.
(there's a few others hidden in the car)

 

[hvyman]

Ah. Didnt know they were the same. Didnt read that far.

 

[IJ.]

Here they're more commonly called a noise suppressor and date back to Wire plug leads...
(in the "old days" you could "hear" the engine RPM's through the radio without them)

Modern cars have them everywhere usually on anything with an on/off load that "might" cause an electrical spike as it's switched, if this spike get's into the loom it can upset the ECU/other electronic devices leading to "issues".

This is my Gumby Understanding I'm sure there are a LOT of other factors.

 

[te72]

Here they're more commonly called a noise suppressor and date back to Wire plug leads...
(in the "old days" you could "hear" the engine RPM's through the radio without them)

Modern cars have them everywhere usually on anything with an on/off load that "might" cause an electrical spike as it's switched, if this spike get's into the loom it can upset the ECU/other electronic devices leading to "issues".

This is my Gumby Understanding I'm sure there are a LOT of other factors.

Interesting... I can hear my rpms rise up and down, but only after installing an amp for the stereo. Is there any danger to the electrical system because of this? I don't mind the noise, but not a fan of vehicle fires either.

 

[IJ.]

Interesting... I can hear my rpms rise up and down, but only after installing an amp for the stereo. Is there any danger to the electrical system because of this? I don't mind the noise, but not a fan of vehicle fires either.

Never heard of it being a problem other than the noise, buy a box of caps/suppressors they're cheap as and start screwing them to things

 

[Nghty89]

I cant listen to AM traffic radio reports because all I hear is rpms in my MR2 lol

Droid X via Gummyjar 2.5

 

[twan]

okay great thanks guys, so technically its not a big deal if i cant find one

 

[hvyman]

Right.

 

[te72]

Never heard of it being a problem other than the noise, buy a box of caps/suppressors they're cheap as and start screwing them to things

Had the same issue with my 88 and we were able to fix it by toying around with where wiring was grounded to, etc... I think in my case it was an issue with the stereo deck's ground. No biggie, I think it's kinda neat sounding haha.

 

[bioskyline]

on the camry it sounded like a supercharger whine on high volume lol.