I have a 84 corvette, I changed the HEI coil ignition module dist cap and rotor, I have no spark, the rotor turns, If I put 12 volts directly to the distributor, I still get no spark
Drove the car into the carport one night, it ran fine, the very next morning it would not start, I never removed the distributor, I thought the HEI coil may have failed, because of the no spark situation, I replaced the HEI coil first, never removing the dist. I then changed the ignition control module, dist cap and rotor, still have no sparkDrove the car into the carport one night, it ran fine, the very next morning it would not start, I never removed the distributor, I thought the HEI coil may have failed, because of the no spark situation, I replaced the HEI coil first, never removing the dist. I then changed the ignition control module, dist cap and rotor, still have no spark
Anything else removed before replacing all parts as mentioned? It sounds like the distributor was installed a 180 degrees offAnything else removed before replacing all parts as mentioned? It sounds like the distributor was installed a 180 degrees off
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Have you ever heard of the "mechanics rule" that says if it ain't broke don't fix it? Put the old coil and module back in they're not part of a tuneup because they can last for the life of the vehicle or not lol. I hope this helps. Take Care.
My first concern is: how do you know there isn't fire? Did you
1- Check it with a screwdriver inside the spark plug wire at spark plug end to ground. This isn't the right way.
2- Have you check fire with HEI spark tester.
(The right way). To see a spark with the tester there will be 25k the spark to jump to ground and it test the coil working properly.
Now the fire system or ignition spark work this way.
When the engine is turning up to 400rpm the camshaft gear inside the engine makes distributor shaft turning. We often see the distributor gear at the end worn like an eaten apple.
Remove the Dist. Cap Somebody starts the engine look for the rotor if it turns. This will tell you the gear is OK.
P.S; What you call the SENSOR = Ignition Module just to let you know
Hope it helps
I guess you could have the ignition analyzed on an oscilloscope. Maybe a tech could see something then. I always heard the only gap was the spark plug gap-the rotor has no gap-are you sure you got the correct rotor? And does it touch the top distributor cap coil wire tower?
Let us know. It is a mystery worthy of a solution.
HEI distributor and burning coils,it in you connection first make sure you install primary and secondary prorperly as it comes out of the cap , and inside the cap wire from modules dont make contact if you are burning its from primary circuit, this is the (B+) or (battery most likely), your secondary is your tach and that need to switch from postitive to negative for it to create spark obvously if tach was grounded or applied power you wont start,but there are times the condensor in the distributor does stays fixed and shorts out the coil (replace that condensor its for suppression) when the condensor is replaced run a fused direct wire at B+ (from ignition) run the vehicle and monitor the tach wire and check to see if that get hot
Fred,
Did you check for spark at a plug wire or at the coil wire? Check at the coil wire,if there is spark there,the ign rotor is bad,very common to have the hot spark "drill" a hole thru the rotor to the dist shaft. Also check for play at the rotor shaft. Distruibtor bushings tend to go bad,making the trigger wheel hit the pickup coil,killing the spark.
It would be great if you could find the Ignition Control Module!!! From my experience on my Jeep...90 YJ 4.2 liter carb. it does not have one...Computer controlled only...
Drove the car into the carport one night, it ran fine, the very next morning it would not start, I never removed the distributor, I thought the HEI coil may have failed, because of the no spark situation, I replaced the HEI coil first, never removing the dist. I then changed the ignition control module, dist cap and rotor, still have no spark
see new posting, thanks
Anything else removed before replacing all parts as mentioned? It sounds like the distributor was installed a 180 degrees off
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