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Unread 09-06-2013, 02:45 PM   #1
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Join Date: Sep 2013
Location: daytona, fl
Posts: 5
4.2l quit and won't start

Guys my daily went down on me and I really need to get this thing running. It has been hard to start lately and hesistating/stalling on me, but finally quit all together the other day and now turns over without trying to fire. Motor is a 76 4.2l with an HEI upgrade

I can see gas spray into the carb when I press the throttle. Pass
Compression is around 150psi in all but #3 (80psi) Not perfect, but pass
Have orange spark at the plugs. (has been orange since i've had it)
Coil and ignition module test good
Timing chain has 7/8" slack (1/2" is the service limit)

What's really puzzling me about this is I can't get it to even try to fire. Take it easy on me im mechanically inclined but still learning. Where should I go from here?

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Unread 09-07-2013, 07:30 AM   #2
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,931
Spark should be blue no matter what.
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An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

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