93 straight 6 engine swap. no spark
Thread Starter
Member
Joined: Oct 2010
Posts: 125
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From: Millbury,MA
Year: 1993
Model: Grand Cherokee
Engine: 4.0
Figured id post here and see what our straight 6 wizzards say but Just as it says i swapped another straight 6 into my zj that i blew up but when i parked it had no runability probs. Swapped in the motor hooked everything up and no spark. Turns over fine plenty of fuel. All fuses check out but the werid thing is coil has power but no spark out of the coil. Now i tried my old coil, boughta crank sensor and still nothing. Has power but i dont think its 12v. Lost my meter so gonna buy another today. The ground by the coil is mint. Aanyone else got any feed back or had a similar problem?
Seasoned Member
Joined: Jan 2011
Posts: 437
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From: Central Jersey
Year: 91
Model: Cherokee
Engine: 4.0 I6 H.O.
When mine 91 did that it was the cam position sensor in the distributor cap, not 100% sure you have one but something to look at. I would first check the voltage to the coil with a meter when you pick one up.
CF Veteran
Joined: Mar 2011
Posts: 2,570
Likes: 4
From: California
Year: 1992
Model: Cherokee
Engine: 4.0 HO
Wouldn't hurt to double check distributor cap and rotor, and plug wires. A lot of the repair manuals have screwed up images of the plug order, it helps to use the screw holes as a reference. Also if you pulled the distributor at any point make sure you have it indexed properly while at TDC.
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Thread Starter
Member
Joined: Oct 2010
Posts: 125
Likes: 0
From: Millbury,MA
Year: 1993
Model: Grand Cherokee
Engine: 4.0
New coil nothing. Shouldnt the crank sensor send pulses to the computer? I checked both wires with power and they are just solid when cranking over
Seasoned Member
Joined: Jan 2011
Posts: 437
Likes: 0
From: Central Jersey
Year: 91
Model: Cherokee
Engine: 4.0 I6 H.O.
What year and model is the replacement engine? Which wiring harness did you use? Which computer? Which year sensors? Give us all the info. You are probably above my skill level but someone on here will know.
Thread Starter
Member
Joined: Oct 2010
Posts: 125
Likes: 0
From: Millbury,MA
Year: 1993
Model: Grand Cherokee
Engine: 4.0
Using my same senors and wiring which is 93 zj straight 6 same computer.. Motor is a 95 straight 6.
Checked wiring. Many times along with fuses. Turns over like a champ. Plenty fuel. Just no pulse to the coil. But it has power and ground to it.
Checked wiring. Many times along with fuses. Turns over like a champ. Plenty fuel. Just no pulse to the coil. But it has power and ground to it.



