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Old 03-13-2017, 05:52 PM
TBT TBT is offline
232 I6
 
Join Date: Mar 09, 2004
Location: Berkshire County, MA / Western PA
Posts: 84
Question need advice, no spark to plugs

I am lost on this. Cruising down the street, Wagoneer stalls. I coast into school parking lot thinking Mr. Gasket fuel pump quit again. Nope have fuel, no spark. Test MSD box grounding white wire. No spark from coil. Leave Wagoneer. Build new ignition using 4 pin GM module. Now I have spark from coil to ground. No spark from dizzy to plugs.12 volts to module, using relay. New module, new dizzy pickup, new cap, new rotor, spark plug wires test good. Still no spark to plugs. Any thoughts?
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Old 03-14-2017, 08:10 AM
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babywag babywag is offline
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Location: Land of froot loops and cukcoo-nuts, CA
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Need more info...how's this thing wired up?
Did you check to see if you have power while cranking and while key is in run?
What year/engine is this etc
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Old 03-14-2017, 09:05 AM
JeepJeepster JeepJeepster is offline
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Join Date: Sep 04, 2014
Location: Kentucky
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If spark is going into the disto cap and not coming out then it should obviously be an issue with the cap/rotary button...
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Old 03-14-2017, 10:55 AM
TBT TBT is offline
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Join Date: Mar 09, 2004
Location: Berkshire County, MA / Western PA
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Thank you for your input. It is a Ford TFI ignition triggered by a GM 4 pin module. Full 12v to the module via a relay. even during cranking. I have found some ways to test the module on the web, and will be doing that once it stops snowing here in Western PA. I may have just thought I saw spark from the coil to ground. It was windy and really cold, and I wanted to be inside as soon as I could. Cap and rotor are new. Which doesn't really say much does it.
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Old 03-14-2017, 10:55 AM
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ZackN920 ZackN920 is offline
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Location: Stephenson County, IL
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Make sure that rotor is still turning when you crank the engine. A few have had issue's with the distributor gears getting shredded. If those gears are wasted, the rotor wont turn.
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1990 Grand Wagoneer-"The Wagon"
AMC 360, TF727, NP229, 2.72 gears, 2" lift
Rancho 44044 springs, Rusty's 2" AAL, TFI w/ MSD C/R
...not too rusty anymore
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  #6  
Old 03-14-2017, 08:40 PM
TBT TBT is offline
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Join Date: Mar 09, 2004
Location: Berkshire County, MA / Western PA
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Thank you. Yes the rotor turns. I'm going to dress up like an Eskimo and do several tests tomorrow. The only things I haven't replaced are the reluctor, and the coil.
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  #7  
Old 03-15-2017, 08:05 AM
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Woodchomper Woodchomper is offline
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Join Date: Dec 17, 2002
Location: Saint Charles, Missouri
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I had an MSD coil that would not throw a spark if the temperature was under 40 degrees F. It was weird to troubleshoot because I could only duplicate the problem on cold days and whenever I went to troubleshoot the problem it was over 50 degrees F outside. It wasn't until I hooked up a old coil in the freezing cold that I realized how weak the spark was coming out of the MSD coil.

P.S. Having a spare distributor with the electrical connection hooked up (w/ spare dist not mounted in the engine) allowed me to manually turn the distributor gear and fire the coil. It made troubleshooting much easier.
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  #8  
Old 03-15-2017, 08:29 PM
TBT TBT is offline
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Join Date: Mar 09, 2004
Location: Berkshire County, MA / Western PA
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Thank you. It's been so blessed cold here for the past week, and not having a garage. It's been tough. Today it was 15 with a wind chill of -1. Not even the dog went outside. You mention of spinning the dizzy when hooked up to the ignition system is one of the test for the pickup module. With your multimeter hooked up between the leads of the module your ohms on the 2000 range should be between something like 500 to 850 ohms. Then set the meter to ac amps and spin the dizzy or crank the engine if its installed. It should read better then 1 volt ac. If it doesn't and the ohms reading was good, try a different reluctor. Seems that Phil, that sleezy little rodent, 12 miles from here wasn't wrong!!
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Old 03-16-2017, 07:50 AM
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Woodchomper Woodchomper is offline
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Join Date: Dec 17, 2002
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Actually the point I was trying to make was that coils (even name brand) fail. In my case the coil performance was temperature related. Or at least the coil performance was degraded such that the vehicle would not start below 40 degrees.

Hooking up a spare distributor was just a quick troubleshooting tip to test the coil. As you stated, there are other methods to test the distributor pickup if it is suspect.
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  #10  
Old 03-17-2017, 08:19 PM
TBT TBT is offline
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Join Date: Mar 09, 2004
Location: Berkshire County, MA / Western PA
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Thank you, one and all. It runs. Warm enough that I could work on the Wagoneer today. Changed the reluctor. Turned it over, and off she went. Thank you again for all, your help and advice.
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