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Old 02-13-2010, 01:21 AM
bigjeepthing bigjeepthing is offline
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Starting problem

My 89 wag won't start the engine turns over but no spark at plugs. It started shuting off while driving I would put in netural hit the key and it would start and run another mile or so then shut off again. I got it home but now it won't fire. I replaced the module no luck. Does anybody know a trouble shooting guide for ignitions. Any ideas would help
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Old 02-13-2010, 02:41 AM
Skeeter74 Skeeter74 is offline
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Check and make sure you have a good connection at the power to the coil. I have had them loose on other rides and the fire can come and go. Then check for power at the coil. The resistor in the power wire can fail and make intermittant contact. I have even seen coils that would "go open" when they heated up.
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  #3  
Old 02-13-2010, 10:59 AM
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travisrda travisrda is offline
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you should also check to make sure that your distributor is turning.
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Old 02-13-2010, 11:57 AM
Joe Guilbeau Joe Guilbeau is offline
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You should have a voltmeter or cheap 12Vdc light tester.

Bump the ignition until you have good voltage at the NEGATIVE terminal of your Coil (9-12Vdc). Turn the ignition off.

If you do not have a good voltage, check to see that the POSITIVE terminal of the coil has the 9-12Vdc, if not then that is your problem.

Now, take a spark plug out, ground the threads against the block and reconnect the spark plug wire that was taken off the plug when you removed it.

With ignition on (but do not bump the engine over, or you will have to repeat the first steps again), take a wire that has been grounded to the block (under a bolt) and touch the negative terminal of the Coil, you should see the spark plug discharge.

If not, then either the coil or the wiring between the coil and the spark plug is problematic, or perhaps the distributor.

If all is well, then assuming that the ignition module is good, either the wiring from the distributor to the ignition module is problematic or the wiring from the ignition module to the coil (grounding wire) has a problem.

You are simply applying power to the coil and then grounding the negative terminal to collaspe the magnetic field and threfore induce a secondary voltage to drive the distributor.
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Last edited by Joe Guilbeau : 02-13-2010 at 12:40 PM.
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Old 02-13-2010, 12:42 PM
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msh227 msh227 is offline
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X2 on the point of making sure your distributor is turning. I went to fire my J10 up yesterday and found out that my distributor wasn't turning due to the gear on the bottom of the distributor was sheared off. Needless to say after all morning of ordering parts I'm going to tear apart the whole front end and I'm replacing the water pump, timing cover, oil pump repair kit, gaskets, and importantly the distributor and Cam gear that drives the distributor.

Good luck
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  #6  
Old 02-13-2010, 02:30 PM
bigjeepthing bigjeepthing is offline
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Ignition

I checked all the wires between the dis and module. With the ignition on I get 12+ volts on the pos of the coil. When I try to start the engine cranks fine but voltage drops to 8.5 volts even when I had jumper cables from another truck to keep battery up. I tried another coil but no luck. The dis does turn. I guess I will start pulling parts off the other truck if I can't find anything else.
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Old 02-17-2010, 09:03 PM
bigjeepthing bigjeepthing is offline
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Is there any way to check the distributor? A new one is $75 not a big deal but I realy don't need a spare.
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Old 02-17-2010, 11:51 PM
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Mark Wilde Mark Wilde is offline
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I'm surprised no one else spoke up....I think I've heard the pickup on the distributor can cause a no-start. I'd be looking at that.

IIRC, the stock ignition system only feeds 9v to the coil when running. If you're reading 8.5 you're good. Bypassing that is one of the upgrades when switching to TFI, to feed a full 12v to the TFI coil.
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  #9  
Old 02-18-2010, 12:21 AM
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ignition module on the drivers fenderwell
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  #10  
Old 02-20-2010, 06:14 AM
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BUZZ BUZZ is offline
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Starting problem - distributor pickup coil

I think Mark Wilde may have your answer. My '86 J10 appears to have had the same problem you're describing. After a few hours of troubleshooting from my '78 technical service manual, I was determined that is was the pickup coil in the distributor. One key measurement to determine this is a resistance read across the coil. I think it's supposed to be in the 400-800 ohm range. Mine was way high, and with all wiring hooked up and the ignition on, I couldn't get a spark to form by passing the distributor trigger wheel by the pickup coil.

Went to NAPA and spent $22, and 30 minutes later, she was running again. The pickup coil comes as a unit, so don't bother with trying to unnecessarily take things apart. I did pull my distibutor out just to make it a little easier to get at, but you don't have to.

Good luck!
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  #11  
Old 05-27-2010, 12:31 AM
mltxj9889 mltxj9889 is offline
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If the pick up coil has gone bad will the distributor still be turning when turning over the motor?
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Old 05-27-2010, 12:41 AM
Skeeter74 Skeeter74 is offline
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Yes.
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Originally Posted by Tatsadasayago
"And on the 7th day god created the Full Sized Jeep and he saw that it was good. He gave these mechanical marvels to his chosen ones and they went wheeling in style and comfort!"

80 Wagoneer Limited, 2 bbl 2150, 360, 727TF, NP219, "Moby Dick" Now with Dragonfire HEI, Contour dual fans, CS144,
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  #13  
Old 05-27-2010, 12:49 AM
mltxj9889 mltxj9889 is offline
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Quote:
Originally Posted by Skeeter74
Yes.

How would you trace down a faulty pickup coil?
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  #14  
Old 05-27-2010, 07:26 AM
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biotex biotex is offline
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Quote:
Originally Posted by mltxj9889
How would you trace down a faulty pickup coil?

Ohm it out. Should be somewhere around 600 to 700 ohms IIRC.
I really can't remember the actual number, but a quick search should yield your answer.

I have been seeing a lot of this posted lately on several different boards.

Engine dies, and won't start back up, or engine dies and won't start till it cools. et...

First thing people do is to replace the Ignition module. Turns out it is the pickup inside the dist.

I'm going to add it to my list of parts to carry with me when I go out trailriding.
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  #15  
Old 06-02-2010, 12:45 PM
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bigbadjeep bigbadjeep is offline
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Im having the same problem, but i get one spark when i turn the key and then none. when i turn off the key i get another spark. Its odd and I have purchased a new distrubutor. what cha think?
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  #16  
Old 06-02-2010, 01:14 PM
Ced Ced is offline
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Quote:
Originally Posted by bigjeepthing
My 89 wag won't start the engine turns over but no spark at plugs. It started shuting off while driving I would put in netural hit the key and it would start and run another mile or so then shut off again.

I have the exact same problem. The amount of time the engine runs without problem gets shorter and shorter, I can't even go 200 yards now!! If I find anything else beside what is suggested here, I will report back.

The funny thing is that before it happened last week, it felt like the engine had never ran smoother!
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Old 06-10-2010, 10:27 PM
Ced Ced is offline
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Dunno if it helps but I removed the coil connector and cleaned up the green oxidation on the contacts, started right up!
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  #18  
Old 06-10-2010, 10:48 PM
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dflocks80 dflocks80 is offline
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My distributor pickup was bad also, and it would cause a no-start at times (when the engine was warm and I went to a restaurant/store and turned the Wag off for 30 minutes or so). However, if I turned it off and back on quickly (like getting gas or something like that), I could get it to start up again. Also, it did cut out on me a few times but would start back up (like you're describing). I replaced it, and haven't had a starting issue with the Wagoneer since then. I'll add to the group suggesting you check it out.
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