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Ignition Mystery! Please Help |
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darnelld
AMC Apprentice Joined: Aug/03/2013 Location: Durham Status: Offline Points: 135 |
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Posted: Jun/20/2022 at 5:27am |
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Hey guys
Here is the short story. Car ran really well, had a nice Cruz last weekend. Went to check the torque on the intake bolts and took of the distributor cap for access. Dumb me tried to crank the car without the cap on, now it wont start. I removed the first plug and put my thumb over it to get it close to TDC and then advanced it a little on the crank. The car will wont start! I am a bit of a loss. Clearly I forgot to do something, but not sure what. Any and all advice is welcome to get my car started. Thanks beforehand Dean
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2713 |
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Just removing and reinstalling the distributor cap shouldn't change the timing.
My guess is there's a carbon "button" inside the cap that contacts the rotor, and when you removed and replaced the cap. it fell out. Can't say for sure because I don't know which distributor you have. Some have the carbon button, while some still have the brass center terminal at the rotor contact. But I'd bet something of that nature occurred.
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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Troubleshooting 101 on older vehicles, check for fuel, fire, and squeeze. 1) Look down carb, pump throttle, do you see discharge from accelerator pump nozzles? If so you have fuel. 2) Take off one plug wire, attach to used plug, lay on block, crank engine, do you see spark? If so you have ignition. 3) Do a compression check on one cylinder, do you have a reasonable reading (> 100 psig)? If so the engine is probably mechanically sound. If you have done all this and it still won't fire, it's probably something simple like it's flooded or something more exotic has happened. But this is how you start to narrow down the problem.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2156 |
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I would look at the center of the cap see if that button is there first then look for spark at the coil
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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rgsauger
AMC Nut Joined: Aug/17/2014 Location: Houston,TX Status: Offline Points: 311 |
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Losing the little spring loaded button sure seems plausible
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darnelld
AMC Apprentice Joined: Aug/03/2013 Location: Durham Status: Offline Points: 135 |
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Hey guys
So the spark is there. I actually replaced the cap, then pulled the plug and grounded the plug threads to chassis. Sure enough spark. THe engine just doesnt try and crank. I pulled the carb out and am cleaning it but this is the last thing I can think of. Even if the engine didnt have compression you would hear it try and turn over, right? All I hear is the starter trying to turn it over. Thoughts? Dean
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4805 |
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What color is the spark? Orange is a cold spark and won't run on it so you need a blue spark.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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darnelld
AMC Apprentice Joined: Aug/03/2013 Location: Durham Status: Offline Points: 135 |
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It looked blue :/
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6614 |
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Please confirm the engine does or doesn't crank. It would really help with the remote diagnosis.
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69 Javelin SST BBO 390 T10
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darnelld
AMC Apprentice Joined: Aug/03/2013 Location: Durham Status: Offline Points: 135 |
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Oh sorry for the confusion. I removed the plug 1 and grounded the threads to the neg battery terminal and then had someone crank the engine. At that point there was a blue spark. When the plug is in the head I turn the ignition over and it will not crank. I just hear the starter. The mechanical fan turns ~one cycle (I can see it from between the hood from the drivers seat) but that is it. Let me know if you would like any other details Thanks again Dean
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