fijiblueman Posted October 15, 2014 Report Share Posted October 15, 2014 hey guys i havent been on in awhile been busy at work and dealing with the kids. I am posting asking for help or ideas where to look to defeat my current problem. She is going in for an interior make over soon and i need to get her running right. First off she is stock with the exception of some hard pipes and a 3 inch exhaust. She sat for part of the summer as i was contemplating the interior and body/paint and when i brought her outta the shop she drove fine and then this happened: I am getting no spark from the coil part of the time Sometimes she starts sometimes she wont she cuts out on long trips, she sometimes dies at a stop sign. I replaced the coil and currently am doing this: when she will not start there is no spark coming from the coil so i take a piece of wire and place one end on the negative side of the coil and to other to the negative side of the battery (with the key on of course) and bam she starts and runs fine for a lil bit. ive checked the wires and everything seem good. Curious if anybody has any ideas it is boost season and i miss her. thanks in advance Paul Link to comment Share on other sites More sharing options...
JohnnyWadd Posted October 15, 2014 Report Share Posted October 15, 2014 (edited) Sounds like for sure one of two problems 1 bad coil 2 faulty wiring or damaged wiring or bad ground Test the coils resistance on the primary and secondary windings. primary test hook your multimeter in ohms between positive and negative about .4 to 2 ohms max is okay , hook leads to positive and coil output and look for 6,000 to about 15,000 is a rule of thumb. I think the book gives slightly different numbers. But a bad coil will show up , because a winding is open or shorted. you ground the coil and it starts? sounds like the pick up in the distributor is bad...test that too. Its in here... http://www.starquestgarage.com/manuals/service/conquest/1988/88_conquest_service_manual_-_group_26_-_electrical.pdf copy and paste from service manual...Ignition coilPrimary resistance 1.12- 1.38 ohmSecondary resistance 9.4- 12.7 k ohm Or just find a sucker in Oregon to sell it to. LOL Edited October 15, 2014 by JohnnyWadd Link to comment Share on other sites More sharing options...
CarlosFley Posted October 15, 2014 Report Share Posted October 15, 2014 Sounds like for sure one of two problems 1 bad coil 2 faulty wiring or damaged wiring or bad ground Test the coils resistance on the primary and secondary windings. primary test hook your multimeter in ohms between positive and negative about .4 to 2 ohms max is okay , hook leads to positive and coil output and look for 6,000 to about 15,000 is a rule of thumb. I think the book gives slightly different numbers. But a bad coil will show up , because a winding is open or shorted. you ground the coil and it starts? sounds like the pick up in the distributor is bad...test that too. Its in here... http://www.starquestgarage.com/manuals/service/conquest/1988/88_conquest_service_manual_-_group_26_-_electrical.pdf copy and paste from service manual...Ignition coilPrimary resistance 1.12- 1.38 ohmSecondary resistance 9.4- 12.7 k ohm Or just find a sucker in Oregon to sell it to. LOL I would've said knock box, no Johnny? Link to comment Share on other sites More sharing options...
Guest Posted October 15, 2014 Report Share Posted October 15, 2014 I would've said knock box, no Johnny? Yeah, I thought the same. A knock box on its way out can do that. Link to comment Share on other sites More sharing options...
Shelby Posted October 15, 2014 Report Share Posted October 15, 2014 the dist sends pulse to igniter and igniter trigers coil to spark , those 3 things and wireing is about all there is to ign , and a good power signal feed from ign swt make sure inj clips are clean esp the pri side , it'l act just like no spark if bad connection Link to comment Share on other sites More sharing options...
jszucs Posted October 15, 2014 Report Share Posted October 15, 2014 and go over and clean up your fuse links in the motor bay Link to comment Share on other sites More sharing options...
JohnnyWadd Posted October 15, 2014 Report Share Posted October 15, 2014 Yeah could be knock box too but the fact that he says he grounds the coil and it starts means the signal from the pickup in the distributor is bad too. Link to comment Share on other sites More sharing options...
Shelby Posted October 15, 2014 Report Share Posted October 15, 2014 can't see how grounding the coil neg would do any thing but short the coil and cause a no sparka momentary touch to ground will cause a spark but weaker then if the igniter did it Link to comment Share on other sites More sharing options...
JohnnyWadd Posted October 16, 2014 Report Share Posted October 16, 2014 (edited) can't see how grounding the coil neg would do any thing but short the coil and cause a no sparka momentary touch to ground will cause a spark but weaker then if the igniter did it Well as you know the coil always has positive B+ at the coil and the "dwell" or saturation happens from the signal side being grounded and then ungrounded so that is probably what is happening. I am just going by what he said. Edited October 16, 2014 by JohnnyWadd Link to comment Share on other sites More sharing options...
fijiblueman Posted October 17, 2014 Author Report Share Posted October 17, 2014 thanks for the help guys im headed to work on it now paul Link to comment Share on other sites More sharing options...
Shelby Posted October 19, 2014 Report Share Posted October 19, 2014 remove the dist rotor and see how much play the mechanical adv assy has , a slopy assy can cause intermittent ign pulse due to stator poles shorting out , if the poles touch i'l short out the pulse Link to comment Share on other sites More sharing options...
SOTTY Posted October 19, 2014 Report Share Posted October 19, 2014 Pull the battery out and dig deep for the big main harness plug under the fuse links , over the years it gets all kinds of dirt and crap thrown at it , unplug it and clean it up and see what happens. Link to comment Share on other sites More sharing options...
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