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Unread 06-13-2013, 05:34 PM   #1
Registered User
1999 FSJ Cherokee 
Join Date: Jun 2013
Location: Grand Rapids, MICHIGAN
Posts: 11
No Spark

I just got done rebuilding my 4.0L after 230,000 miles. Broke a piston and had the entire engine honed (.010 over) milled and completely done over and ground the crank .010 under.

The problem that I am having is I've gotten it all completely back together but I don't have spark at the plugs.

I've checked the coil and it tests good. 1.4 ohm reading on the 20M setting though the two poles on the plug and 12.1 ohm reading on the 200k setting on my multimeter. I've checked all the wiring (i think) to make sure there aren't any broken wires. And I verified that all the plug connectors are in good shape.

I've got all new wires, plugs, distributor cap and rotor. I've verified timing about 4 times.

The only thing that I can think of being bad would be the hall switch in the distributor, or the crank position sensor.

Any help on this would be greatly appreciated!!



Sfmonday is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 07:22 PM   #2
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,658
So crank sensor is verified connected? I'd try cleaning the crank sensor connector with electrical contact cleaner as any debris that might have gotten into that connector could inhibit the signal.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
tjwalker is offline   Reply With Quote Quick reply to this message
Unread 06-13-2013, 08:27 PM   #3
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1988 XJ Cherokee 
Join Date: Dec 2012
Location: Lillington, NC
Posts: 994
Crank Sensor test/ or just replace it.
99WJ Laredo I6-A 2wd
88XJ-Building on a budget.
95 E34 540i-DD
79chiefs is offline   Reply With Quote Quick reply to this message

coil testing , spark , wiring

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