Question about 1985 Chevrolet Chevy

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No spark at spark plugs

On my 1985 Chevy pickup 305, I have no spark. I replaced the pickup, condensor, module, 4 prong computer harness, distributor cap, coil, rotor and wires. It fired up but the pickup was too tight for the vacuum advance to move it so I sanded down the shaft until the pickup coil was just free to move. Now there is no spark again. Chiltons says there should be 6-30,000 ohms between the carbon button and the bat terminal on the coil. There is none but 2 I checked at the parts store did not either. I am out of ideas. There is an early computer in the dash the 4 prong connector goes to but I think this just retards the timing for spark knock, I don't think it would cause it to not start.

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  • diver648 Nov 30, 2008

    That's possible, this is the original distributor and in the past the pickup coil has stuck but I was usually able to free it up. All 3 pickup coils appear identical. I had replaced the original one about 10 years ago. I did the resistance checks again this morning and tried replacing the module again. Nothing. I remember at one time, jumping the green and white wire in the 4 conductor harness to the computer to trouble shoot if it was the computer. I just can't remember if a bad computer would cause it not to have spark. It really only controlled spark knock and retarded the timing if it was detected. I had removed the spark knock sensor years ago and have not had a problem until now. Still baffled.

  • jim4500 Feb 27, 2009

    I have a 1985 Chevrolet Chevy Silverado v8. The funny thing is it will crank up run perfect. If I come back about a hour later or next day it will not start. Next day or next it will start. I checked all wires on the outside leading to the dist. I installed a new cap and coil and rotor. It fired right up. A hour later same old thing what's left to try?



    When it would not start - I got someone to try to start it and I took off # 1 plug wire and while engine was spinning over it had no spark.



    Can you please help?

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  • 7 Answers

You have the wrong pick up coil. It should have plenty of clearence for the shaft. compare it to the old pick up.

Posted on Nov 30, 2008

  • autotechguy Nov 30, 2008

    You have the wrong pick up coil. It should have plenty of clearence for the shaft. compare it to the old pick up.

  • autotechguy Nov 30, 2008

    Okay what is the resistance of the pick up coil? try unplugging the four wire connector a dist and see if it starts, it should. If it does not, take cover off of coil. key on with test light connected to negative batt, check for power at coil leads in cap. There should be power at the right lead. Now attatch your test light to the positive batt post. Check center lead in cap, the light should be on, if not did you remember to put the ground strap from the old cap that goes under coil? Did you remember to install the button under coil? Now connect the test light to the left coil lead. crank engine while test light is hooked to poss battery and the left coil lead, the test light should pulsate on and off while cranking. Oh specs on pickup coil if you have a ohm meter should be 500 to 1500 ohms. unplug pickup when testing. Last but not least are you sure the distributor is turning? Did you install the dist correctly,if all these checks are ok, check for spark when cranking use a old plug and connect to a plug wire to test if you do have spark, the dist timing is off. Did you mark the dist and rotor? The dist may be installed 180 degrees out.

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