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2g Manifold capacitor part?

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my_gst95

20+ Year Contributor
569
10
Nov 13, 2002
Sacramento, California
Well, i'm not 100% sure its a capacitor, but... There is a silver round piece that looks like gets grounded on the intake manifold of a 2g. I did a 6bolt swap and must not have tighten it down properly, and because it was lose, it was causing my IGN fuse to constantly blow. I removed it and the car runs fine now. What is it for and can I run without it?

my_gst95
 
Solution
It is called a condensor it is there to absorb the large amount of voltage that a large inductor will create when the current throught is changed rapidly. I would make sure it is on there for your ecu's sake. basically V=L (di/dt) so say your coil has an inductance L of .5 henri's and it has a resistance of 3 ohms, it will be flowing 4amps through it when it is flowing. sudenly this current is shut off. (very large di/dt) say it takes .001 seconds for the current to goto 0. then di/dt is 4/.001 which is 4000 amps per second so if we put this into our earlier equation we ha V=.5*4000. so V=2000 volts presented to the output transistor on your ecu. coincedently those only are rated for around 100v obviously it won't last long like...
Well see I broke that fragile wire and the would not boost under WOT it would how would you say...twitch like you were pedaling it. DSMlink logged no knock and IDC and everything were fine. I soldered the wire and boom fixed! But then i bumped it and the wire broke right where it goes into this cylinder thing, so I am trying to figure out what it is.

http://members.shaw.ca/dsm.1000q/Engineprimer/2G/brakemaster.htm

That link shows a picture of the small cylinder thingy at the end of the intake manifold. left of the bracket to the brake master cylinder
 
IIRC it is a noise condenser and should be grounded as close to the coil packs as possible. I'm not sure why it would cause your car to run like crap but it will affect electronics negatively if it isn't on there. Maybe your picking up enough signal noise that you end up with ignition system issues.
 
THIS? I've never really known what it does, but makes sense if mork is correct.

EDIT: Courtesy of "luv2rallye"

The noise condensor suppresses high frequency spikes which helps all electronics - the radio being the most suspectable. I'd leave it in - needs to be connected right at the coil connector to be effective.
 
I heard from a friend that without it some cars will not connect with DSMlink when it is removed. I did not try mine because that wasnt the problem. I would just seem to have break up at high rpm(5500+) I guess I have a lot of signal noise and is causing the coil pack not to fire right.

Now I need to find a 2g to pull it off of, this is going to be hard.
 
I don't have one, car runs fine. I'm running a 63t out of a 1g and a COP setup though.
 
They're also to keep RF interference from confusing the ECU.

The Volkswagen Squareback wagon was one of the first electronic fuel-injected cars sold in the US. If you keyed a CB radio next to the left-front fender (where the brains lived), it could stall them.
 
So I was removing my hard coolant pipes because they were extremely rusted and I wanted to paint them. Anyone who has ever done this knows that its a pain. I was disconnecting things so that I could get to the pipes easier when suddenly a wire snapped off a little gray spray can looking object connected to my engine block. It is directly under the valve cover and it fell somewhere in the engine and I cant find it. Can anyone tell me what it is so I can go to auto zone to replace it? Here is a pic of it.
 
oook guys so it has nothing to do with engine management or make my car run crappy right cause i really got scared when it broke LOL thanks guys
 
+ on the sound filter I've seen them on anything that’s electrical and spins, moves fast, such as old distributors and the like, as said above stops interference with any other electrical component in the car i.e. your radio or anything close by for that matter.
 
changed the block on my car and now i'm wondering where this part goes and what it does.
 

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Looks like a capacitor used for noise reduction. Generally they have some tangs on them so that you can mount it to the firewall. But, in your case it looks like those are gone. It should be grounded to something though. That one might go around the coilpack area.
 
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