Weak spark and I'm searching for the cause
Posted to Technical Discussion Forum on 1/25/2016
20 Replies
I am working on a Jeep Liberty 2.4L. You can see the
TechHelp that I started here: http://members.iatn.net/techmail/view/index.aspx?m=16337&t=chry_drive&tmv=1&au=1
The spark coming from the ignition coil is very weak. It has
a yellow/orange color instead of a bright blue, normal hue.
All four terminals are sparking and look the same. I have
tested all of the coil wiring to the PCM and all checked
out. I scoped the CKP, CMP, TPS and traced all of the
associated wiring of each and they are good. I have 12v
coming from the ASD relay and both of the signal wires flash
brightly using a test light. Today while following the diag
tree, I changed out the coil with a known good OEM unit with
no change whatsoever. What could be the cause of the weak
spark? What controls the spark output? Possible grounding
issue? Here is the kicker, sometimes the truck will start
and run like normal. I have not been able to check what the
spark looks like when this happens but I can only assume
that it is normal. When it is acting up, it has an extended
cranking issue. It will crank and crank then finally start,
probably due to the super weak spark signal. Thank you for
any input. I am about to give up on this one, its consuming
me.
Shawn Freeman Owner/Technician Country Road Tire and Auto Service Kittanning, Pennsylvania, USA
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