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Unread 08-12-2006, 05:54 PM   #1
Gizimomo86
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1995 ZJ 
 
Join Date: Feb 2006
Location: Oregon
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Coil Gone Bad? Please help ASAP!!!

Ok - so wednesday night I parked my Jeep - no lights were on, nothing. Turned my Jeep off, and locked the doors and headed in for the night. I came back out thursday morning, got in, turned on my Jeep - the damn thing wont start!!! it will turn over, but wont start! My dad thought it was the coil - ok - got that replaced, since the wire that hooks into the coil still has charge or whatever going through it. That didnt work. I replaced the distributer, again, nothing. So my friend came over last night *friday night* to take a look at it as well *ended up replacing the spark plugs for the fun of it, even though that wasnt the problem* And again - nothing. Aside from it being probably an electrical problem - could the coil be a dud? The spark plugs wont spark - but the wire that connects to the coil *from behind* still has its charge, like its working - what are your thoughts? Please Help ASAP!!! This is my only running *well sitting now* vehicle!
~Beth

*1995 Grand Cherokee 6cylinder 4.0liter

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Unread 08-12-2006, 06:04 PM   #2
matts98ZJ
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two things it could be is the crank sensor witch in on bell housing of trans or cam sensor it is in the dist under rotor butten in housing its easy to change. try cam sen first
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Unread 08-12-2006, 06:24 PM   #3
greasefingers
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You can measure the resistance of the Input (primary) and Output (secondary)

1.1 ohms here


12,160 ohms here

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94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 08-12-2006, 06:29 PM   #4
greasefingers
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I would remove the coil wire at the center post of the distributor, and hold it away from ground (the cylinder head) and see if it sparks.

If the resistance checks are fine and no spark then that would most likely point to the CPS.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 08-12-2006, 06:30 PM   #5
Gizimomo86
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So the 2nd picture is what it should look like? My friend is going to scan my computer anways *hopefully on monday* and if theres nothing wrong with the computer, then we will re-try the coil. Im almost thinking my old coil was fine to begin with - I will have him test it, thank you!!! and I will also have him check the sencors, thanks again guys!!!
~Beth
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Unread 08-12-2006, 06:34 PM   #6
greasefingers
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Look at the multimeter leads. They are in different positions for each pic. Both values need to be in spec
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 08-12-2006, 06:44 PM   #7
-Joe-
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Quote:
Originally Posted by Gizimomo86
So the 2nd picture is what it should look like? My friend is going to scan my computer anways *hopefully on monday* and if theres nothing wrong with the computer, then we will re-try the coil. Im almost thinking my old coil was fine to begin with - I will have him test it, thank you!!! and I will also have him check the sencors, thanks again guys!!!
~Beth

Have you checked for codes yourself yet? key on/off three times and count the flashes..
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'95 Jeep Grand Cherokee Laredo I6 4.0L
242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
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Unread 08-12-2006, 11:37 PM   #8
jeep946
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i am going to say it is the crank position sensor as well. the coil wire will have 12 volts to it with the key on. the pcm controls the ground wire and completes the ground when it is time for a spark.
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94 Grand Cherokee, 4.6 stroker, 7 inch custom long arm kit, 33x12.50x15 Firestone destinations m/ts, flow-master 40 series, magnaflow high flow cat, locked front and rear, super axle kits front and rear, pioneer head unit, CB on channel 10, and a B&M built transmission, switched from a 231 to a 242, 2000 Grand Cherokee steering and knuckles and brakes, no abs, wildwood adjustable proportioning valve, and lots more
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Unread 08-13-2006, 04:34 PM   #9
Gizimomo86
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thanks everyone for your help - my friend will also check *probably for the fun of it* the relay's and see if he can find anything. This is just so random that this happened! I miss driving my warthog!!!
~Beth
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