Ignition Coil No Spark. Replace Contact Breaker?
So, I replaced the ignition coil to my 1993 volvo 850 because I wasn't getting any spark coming out of the coil. However, after I installed the new coil I was still getting no spark. I read up on it and multiple people told me that this is likely due to the contact breaker not being able to break the circuit which causes the high voltage output from the coil. I could not find any manual for the volvo that tells me how I would go about replacing this. Does anybody know how I would go about doing this or if this is even the issue? Would very much appreciate a reply. Thanks
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what kind of voltage are you getting coming into the coil?
- de Jimfixer
So we replaced, the battery, coil, cap and rotor, ignition wires, you name it. Pretty much everything involving the ignition system we ended up replacing and with no luck. However, we were testing the voltage coming out of the coil with a test light, but my friend who is a mechanic told us that we should put a screwdriver into the plug coming out of the coil and bring it close to a piece of metal and see if we can see sparks jumping when we crank the engine. We did this and did not see any sparks. This makes me think that the voltage coming out of the coil is not anywhere near high enough and that's maybe why we arent getting any spark. We are certain 12v is going into the coil, just uncertain on what's coming out (we assume it's not enough). We just replaced the old coil with a new one so we are pretty sure the coil isn't the problem. This is why we think there is a problem with the contact breaker.
- de Alex Hughes
We looked online on how to get to the contract breaker points and everywhere said its underneath the cap and rotor. However, when we took those off all we see is a metal plate and no signs of the breaker, condenser, contact heal, or anything. Is it different for a 1993 Volvo 850? Is what we're looking for under the plate? If so how would we take the plate off, we tried. Sorry if I'm rambling but hopefully you can understand what I'm saying. Would love if you could help us. Thanks
- de Alex Hughes
@ahughes05 all you need to do is to attach a timing light and turn the engine over. If the light flashes you know that you get power to the plugs.
- de oldturkey03
The reason I asked the voltage is if you dont have enough voltage coming in the voltage out wont be there . you need twelve volts coming in to get your 30000 volts out .test the voltage with a multi meter for accuracy, a test light will light at a low voltage so just because it lit doesnt mean you have 12 volts . Coils can be tested with an ohmmeter (most coils will give a reading around 8,000 ohms) or with the small scope on a Sun machine. A normal coil will give you a “heartbeat” pattern on the scope, shorted windings will produce a “bumpy L” pattern and open windings will give a flat horizontal line.
All coils with metal housings can be tested for grounded windings by touching one probe of a test light on the metal container and the other to the primary and high-tension terminals. If the tester lights or you see sparks, the windings are grounded out and the coil is defective.
Just because a coil is new doesnt mean its good the new coil could be DOA
- de Jimfixer
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