Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
this could be a weak coil,,these will do this sometimes..also,the rotor is the only thing between the coil and the wires,,these rotors will sometimes burn a pin hole in the bottom of them..causing them to ground out...may be a weak coil...be sure to remove the distributer cap and make sure the rotor is turning,i have seen the gear strip off of the distributer
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I just installed a brand new coil ....since your advice.
It sparks fast and blue from the coil to a spark plug grounded to the block.
STILL no spark to the plug from the distributor cap! (I have tried 2 different cap and rotors from 2 different companies.)
Rotor is turning
this makes no sense to me if it isn't the rotor..i will opt out..maybe one of the other guys has an idea
I am almost positive it is "Z"
I m not home to check now.
There is nothing special inside cap/rotor ...how can I have good spark from the coil to the distributor cap and nothing to the plug wire and plug?
I will check it. The rotor can only go on one way as there is a groove in the underside of the rotor that fits the slot in the distributor shaft. I would think it would strip or snap if caught on the cap as the engine turns over fine.
It HAS to be a cap/rotor issue doesn't it? Nothing else in there....
Where does the coil wire go on your cap?
Definitely not. Coil wire is in the top center of the cap.
I don't understand why if I'm getting spark to the top of the cap, why it is not being distributed to the plugs.
1) Does the top carbon pin located on the underside of the cap (from coil) have to make contact with the rotor? There is no way to know if it is...and the cap and rotor seats firmly and evenly.
I'll try it......
This is a tough one......
I have a multimeter.....
voltage could be 5000-40000 depending on the coil.
I can tell you the spark was fast and blue white which has always been my standard for a strong spark.
I have been working on this for 4 days now and have asked tons of people...No luck yet.
1) If there is spark going into the cap, it HAS to be going somewhere or stopped by something.
I tested it a few days ago...12+ volts
continuity read within book parameters on all leads.
screw driver in the cap end and hold varying distances from the block?
I won't be holding it.....I'll check it in the morning.
1) Turned the cap over and tried starting it. No visible spark.
2) Put screwdriver into wire coming from coil and attempted to have spark fump to ground. .......Nothing.
3) Rechecked voltage to coil. connector from wiring harness :
Pink and white wire = 0 volts
Pink wire and block (ground) 12.5 volts
4) I continue to have fast, bright blue/white spark from coil wire to plug/block ......No spark from distributor to plug.
How would I check if they are plugged in? ....splice a wire?
If you take the test lead it should fit down the side of the wire into the plug itself. If it will not then take a safety pin and poke a small hole into the cover of the wire and then stick your test lead to the safety pin. This will not hurt the wire.
Do you have a test light? If not can you barrow one? If you can not then you will need to make one or go get one to do the next test.
Ok. I will test tommorrow. I am working now.
I am assuming that the white wire must be a control from the computer?
I checked the pickup coil per the haynes manual:
I connected the multimeter (ohms) to the two connectors from the pickup coil plug and got "805" The book says I should have a steady value between 500 and 1500 ohms.
I connected one end of the multimeter to one of the pickup coil plug contact and the other end to a ground and got "1" which I believe to be infinity (normal)
When I connect both ends of the ohmmeter to each other It goes from "1" to 0000
which I believe indicates the ohmeter is working correctly.
When the leads of the ohmeter are not connected to anything that reading (in my case"1") would be considered infinity right?
The reason I ask is that if it is the Haynes book tests of the pick up coil that I performed shows "normal"
You were right on the money!
The Distributor/ignition module that I bought (new) was defective. I replaced it with another new one and it fired right up. The truck runs better than it did before!