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Old 07-28-2015, 09:56 PM
DBX11's Avatar
DBX11 DBX11 is offline
232 I6
Join Date: May 18, 2009
Location: Northern Kentucky
Posts: 216
timing light troubleshooting

Interesting discovery today; intermittent rpm on plug wire #7. So I wiggle the wire and rpms return and a small tick,tick goes away... Let pressure off and tick,tick returns and rpms go back to zero. I suppose a bad crimp on the msd wire is causing this. So without touching the wire with anything but the timing light lead I increase the rpms and watch the light change from 0 to 1200ish and when I let off again it returns to 0. This only happens on #7 wire and rpms are there when the throttle is twisted and not when released.

When I get some time ill redo the crimp And check the plug and inside the cap but this method could be used if a fouled plug is suspected or in my case (hopefully) just a bad crimp although you need a digital type timing light.
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Old 07-30-2015, 06:43 PM
will e's Avatar
will e will e is offline
Always Broke
Join Date: Nov 16, 2001
Location: Mesa AZ
Posts: 9,996
Good for you. I discovered the same troubleshooting technique about 6 months ago when my #1 wasn't firing right. The RPM's were jumping so for grins I tried a different wire and it was steady. I had a cracked spark plug.

I wish someone made an affordable scope...
82 Cherokee WT – SFwith Alcan/agr box/Borgeson shaft/ 401/performer/Holley TA/HEI/BeCool/727/ALTAS(2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave,Discs, ARB,Artec Truss)/MTR 37/Corbeau Moab Seats /Hella/tuffy console/sliders/custombumpers&roll bar/WARN 8000/steering brace/CO2 Tank/dual batts/custom TCskid plate

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Old 07-30-2015, 08:04 PM
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Carnuck Carnuck is offline
Join Date: Feb 12, 2011
Location: Gold Bar, WA
Posts: 6,419
Actually, there is an adapter to hook to old TV sets. My buddy found one that he runs on his smartphone but he won't tell me what it is (It's supposed to be proprietary)
Jeep gauges are for amusement only. Any correlation between them and reality is purely coincidental.
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