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radio noise capacitor?


mwh0428

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I have a 1990 2.3l ranger with the dis electronic ignition and I had a a coil go out last week when I pulled the coil off I heard something hit the ground and this was it. It looks like a condenser from an old points system. When it fell the wire cam out so i got and bigger wire and stuck it in there and it worked good for a couple days till it came out and the engine died. I looked in my hanes manual and it says that its a radio noise capacitor. Is it the same thing as a condenser or is it something else?
 

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RonD

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Electronically it is the same thing, it smooths out voltage spikes and drops, it can absorb voltage or release voltage quickly.

It was used on points or on coil, same pathway, just different locations.
Yes, it can prevent static from ignition system interfering with AM radio reception

The word condenser for this device was dropped in the early '60s when A/C became more common in vehicles, air conditioning uses a condenser, not the electronic kind.
 

kimcrwbr1

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As the coils use up power it creates noise measured in hertz. The capacitor keeps the voltage steady at the coils eliminating RF noise. I doubt is has anything to do with the ignition unless the capacitor is shorted internally. Measure it with a ohm meter it should read infinity or zero resistance.
 

gw33gp

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Did I understand you correctly that the wire fell out of the capacitor? If that is true, sticking a wire back in it will not work very well. It probably shorted out and that is why the engine died. You need to install a new capacitor.
 

mwh0428

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I bought two condensers and they didn't work then I went to the scrapyard and got three and it still doesn't work I checked spark and I have no spark on either side of the engine. is there a way to test the crankshaft position sensor?
 

tomw

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The CKP will have a 'bump' in signal for each 'square tooth' and a ..... for the widely gapped one.
Did you test that the coil(s) are not shorted? I believe all screws originally used must be re-installed as the multiple coils must all have ground.
On an EEC-IV, key on, there should be 12v at the coil, and when the key is moved to off, the coil(s) will drop saturation and produce spark. Nothing else required. With DIS/EDIS... read the book.
Any and all coils should produce a spark when you disconnect from the controlling device(TFI, remote TFI, etc), and apply 12v for a second and remove it.
A capacitor will 'shock absorb' current that would otherwise try to keep flowing past the 'controlling' item, such as points. A radio suppression capacitor, if removed, will allow more Buzzzzz, increasing in Hz, to be heard in the sound system(esp AM radio.)
bye
t
 

mwh0428

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Found my issue I had a corroded wire by the left front fender and it was the wire that powers the coils.
 

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