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1986 Chevy 305 w/ HEI No Spark at Plugs.
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Stumped
Novice
Jun 26, 2008, 9:52 AM
Post #1 of 14
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1986 Chevy 305 w/ HEI No Spark at Plugs.
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I have a 1986 Chevy c/10 with the 305/5.0 in it and a HEI ignition and Vacuum advance.
Heres my problem: I was driving along and I lost all power in the cab of the truck, the head lights worked but nothing else. I checked under the hood and noticed that the fusible link had come off the junction block under the hood, fixed that and all the power in the truck worked again.
BUT now it wont start. I have recently (3 months) replaced my plugs, plug wires, coil ,rotor, and my cap, I thought it was the Ignition module so I replaced that yesterday, I checked the wires that go to the module and they are OK. I am getting power to the coil but im getting ZERO spark at the plugs when I try to turn it over.
Any Ideas?? Please Help!! Thanks
I really am
Stumped
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Tom Greenleaf
Ultimate Carjunky
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Jun 26, 2008, 12:21 PM
Post #2 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Guess: Wires to the ign module move with the dists that have vacuum advance. Those wires can rub and cause problems,
T
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DanD
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Jun 26, 2008, 1:58 PM
Post #3 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Yea Tom the Pick-up coil’s wires were famous for breaking inside their insulation and the insulation not even crack.
It was an automatic thing back then, during a cap & rotor change; too hook your finger around the individual wires from the pick-up and give them a bit of a tug. I can’t count how many, where the insulation was the only thing holding the ends of the broken wire together.
If they seem OK that way; get an ohmmeter connected across the two wires and take a reading; it should be around 900 -1200 Ohms.
Next; test if either of the wires are shorted to ground. Connect one meter lead to one of the pick-up coils wires and the other lead to the distributor housing; it should show open (no connection). Then do the other wire; it also should be open.
Last thought and while you have the ohmmeter out; is check if the distributor has a good ground. Connect one lead to the distributor housing and the other to the engine block; there shouldn’t be any more then 3 or 4 Ohms.
Dan.
Canadian "EH"
(This post was edited by DanD on Jun 26, 2008, 2:13 PM)
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Stumped
Novice
Jun 30, 2008, 8:00 AM
Post #5 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Well the pick up coil seems to be fine so im still on the hunt for the problem, I hope I can figure this out :(
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Tom Greenleaf
Ultimate Carjunky
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Jun 30, 2008, 11:02 AM
Post #6 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Have you tested those wires electrically? They can look good as Dan said and be weak or downright broken inside. If you've take unplugged some for checking and attempted starts, check again for spark at the plugs. All the attemps may have flooded out the plugs - guessing.......
T
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Double J
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Jun 30, 2008, 4:46 PM
Post #7 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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This link will show how to test the P/U coil leads.
Click.....
Jim
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Tom Greenleaf
Ultimate Carjunky
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Jun 30, 2008, 6:42 PM
Post #8 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Just a wild thought on this thing ongoing ----------- is the distributor turning - cap off, can you see it turn? If not, it's rare as all get out but the gear can shear that turns some distributors,
T
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Stumped
Novice
Jul 1, 2008, 9:12 AM
Post #9 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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This is what im doing to check for spark. I have a new spark plug stuck one of the plug wires ( I have tried it with 3 differnt plugs just in case) and im tring to crank it up. the old plug is still in the engine I just pulled the wire off.
When I replaced my ignition module I checked the wiring harness on both side of the module with my meter all the wires are good ( Does anyone think that little solinoid might have gone out that hooks in those wires??)
My rotor is turning so I dont think I sheared a gear ( I thought the same thing )
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Tom Greenleaf
Ultimate Carjunky
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Jul 1, 2008, 10:08 AM
Post #10 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Ok: In checking for spark that way you DO have to ground the plug - are you? Also know that gas soaked plugs (not all) can spark in your face out of car but under compression accept the spark but it will find ground thru soaked porcelain (sp?) and not make an actual spark to fire. They can look dry and do this. New or they must be heated with just a propane torch till red before they'll work in the engine again.
Just some thoughts on why this is screwing you up as it usually isn't this much trouble,
T
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DanD
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Jul 2, 2008, 3:45 AM
Post #11 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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By chance when you replace the cap & coil you didn’t forget to swap-out the ground strap that’s under the coil?
That happened here at the shop, not all that long ago; the apprentice forgot the strap.
By the time we figured out what he had done; we had to replace the ignition module that had burnt out.
This strap is the path to ground for the ignition coil’s negative primary windings. What I think happened is; with the strap missing the coil found its ground through the module, burning it out from the excessive current flow.
If by chance you did leave that strap out; you may be into another ignition module?
Just a thought?
Dan.
Canadian "EH"
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Stumped
Novice
Jul 3, 2008, 8:01 AM
Post #12 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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I used new plugs BUT I wasnt grounding them but I grounded them and still no spark :(
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Stumped
Novice
Jul 3, 2008, 8:03 AM
Post #13 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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By chance when you replace the cap & coil you didn’t forget to swap-out the ground strap that’s under the coil? That happened here at the shop, not all that long ago; the apprentice forgot the strap. By the time we figured out what he had done; we had to replace the ignition module that had burnt out. This strap is the path to ground for the ignition coil’s negative primary windings. What I think happened is; with the strap missing the coil found its ground through the module, burning it out from the excessive current flow. If by chance you did leave that strap out; you may be into another ignition module? Just a thought? Dan. I wish that was the problem.. but its not, thanks tho it would been easy to overlook |
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Stumped
Novice
Oct 14, 2008, 7:33 PM
Post #14 of 14
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Re: 1986 Chevy 305 w/ HEI No Spark at Plugs.
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Im sorry I havent posted the results but it turned out that it need a distributor or some part that came with the new one . Installed it and it fired right up. Thanks for all the help.
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