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Old 10-21-2004, 11:21 AM
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Ignition problems

I have a Chevy pickup 1976, with a (to my knowlege) stock 350 motor. Resently i was driving an then suddenly the motor just stalled, no sounds just stopped.
I have figured that it has to do with the ignition as i can smell the gas trying to start the car and i cant seem to get sparks.

I have now changed the ignition module, the coil and the coal piece placed under the coil, but my motor still wonīt start.
Can anybody help me?
Is there anyplace i can get some drawings of the wirering and preferably a troubleshooting manual?

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Old 10-21-2004, 11:36 AM
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1st...Take the distributer cap off and make sure the rotor is turning when you crank it. Timing chain may be broken.

2nd...make sure that you have 12 volts to the coil.


3rd...see if it has spark. Take a plug wire off the plug and put a screwdriver in the socket and hold it near a ground. Crank it over, if you have spark you will see it jump to ground. Needless to say, don't touch the steel on the screwdriver while doing this.

If no spark, it is an ignition problem....
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Old 10-21-2004, 11:52 AM
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coil ground
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Old 10-21-2004, 11:55 AM
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i forgot to tell but the rotor is turning, itīs hard to test the spark alone but i have tried but canīt se the spark.
What wire on the coil is suposed to have 12V?
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Old 10-21-2004, 12:02 PM
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Quote:
Originally posted by Bjornar
i forgot to tell but the rotor is turning, itīs hard to test the spark alone but i have tried but canīt se the spark.
What wire on the coil is suposed to have 12V?
lol, the positive one man! Shoudl be red, or at least coming from the main wiring harness. THe ground should be just that, grounded to the firewall or some close metal item.

K

btw, do you have a ballist resistor? Perhaps its popped.

K
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Old 10-21-2004, 12:05 PM
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76 Chevy should have an HEI distributer, coil on top of cap. The red wire should go on the terminal on the drivers side of the cap. Closest to the firewall.
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Old 10-21-2004, 12:17 PM
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Itīs a HEI distributor, and the red wire (nearest to the firewall) is conected to a wire whit a condenser ore something. But there also is a terminal whit no cable conected, (the yelow from the coil) am i missing a cable ore is this suposed to be free?
and if there should be a cable conected where should it be conected (the other end).

Thanks for all your help.
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Old 10-21-2004, 12:21 PM
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That other terminal is for a tach, if so equipped. It doesn't need a wire hooked to it. That condenser thing you are talking about may be a balast resister. Is there another wire going to the other end of it?

If you have a test light or volt meter, check to see if you have 12 volts at the red wire terminal with the key on.
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Old 10-21-2004, 12:28 PM
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if its a rectangular ceramic chunk, its a resistor. Bypass it and see if it starts. If it does, go down to autozone and get another one for 2 bucks.

K
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Old 10-21-2004, 01:08 PM
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The "thing" conected to the wire is round but it doesnīt mather as i measured 12V on the red Wire, so that isnīt the problem.
As i am alone itīs pretty hard to both turn the ignition, and se for sparks, what i did was to put my 12V test lamp into the spark plug hose to se if it led upp. It didnīt but should it?
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Old 10-21-2004, 01:12 PM
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No......................But if you got voltage there, you may have blown your tester...............lol

Get another spark plug and ground it somewhere that you can see it from where you crank the engine over. You should be able to see the spark from there.
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Old 10-21-2004, 03:03 PM
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HEI

[size=3]Doc here

To test the Coil, get a DMM and set it for ohms. Put one lead on the "BATT" Terminal (Should be marked on the cap) on the top of the cap, and the other on the rotor pickup on the inside of the cap, It should read ABOUT 6000 ohms.

Next is the TACH side, it should read the same...then with your leads on Batt and Tach, it should read 0.00 ...

If it's an HEI than it won't have a resistor. It will be straight 12 Volts into the Cap.

If the coil is good, and you replaced the module, then I would suspect the magnetic pickup and pole piece (the electronic version of points) inside of the distributor. These Fail quite often and kill spark. (see photo)

Also Have the auto store recheck your new module again..A lot of these are dead right out of the box...(Bad QC) and don't forget lots of silicone grease when you go to put it back in..heat will shorten the life of the module.

If you want to see if you have spark, just hook up a timing light and have someone crank it for you...If you do, it will flash.

Doc
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