flufrooster Posted December 7, 2014 Share Posted December 7, 2014 I have a 1991 4.0 Comanche that has a 88 Cherokee motor swap. When it was swapped everything on the old 91 was put on the 88. Now it won't start. We changed the computer, dizzy, cap and rotor, wires, tried two new cranks sensors and flexplate. It will crank but not fire. The spark goes snap snap snap snap snap snap. Anyone have any ideas why it won't spark like it should? Link to comment Share on other sites More sharing options...
gogmorgo Posted December 7, 2014 Share Posted December 7, 2014 If you're using the flexplate for an '88, it won't work with the '91. You need one that matches the electronics, so if you've got the HO computer and everything for a '91, use a flexplate for a '91, but if you're running Renix electronics, you'll need the Renix flexplate. Another member on here a long while ago was having issues with new flexplates not having windows in the correct spots, but I don't remember if it was for Renix or HO. I replaced my cracked flexplate in March with a cheap one from RockAuto that worked perfectly in my '91. It might not do you much good if the motor's never been started, but have you tried checking for codes? Link to comment Share on other sites More sharing options...
flufrooster Posted December 8, 2014 Author Share Posted December 8, 2014 It has the 91 flex plate in it. We haven't checked codes. It has everything that came off the 91 motor. Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 8, 2014 Share Posted December 8, 2014 Double check your distributor indexing. No matter how many times I pull one, I always find a way to slide it in wrong the first time. Here's a pretty good guide: http://tomasz.korwel.net/2006/12/19/replacing-ignition-distributor-in-jeeps-40l-engines/ Where are you checking your spark? Off the coil, or at the spark plug? Link to comment Share on other sites More sharing options...
flufrooster Posted December 8, 2014 Author Share Posted December 8, 2014 Off the coil Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 8, 2014 Share Posted December 8, 2014 Try it at a spark plug or two. Link to comment Share on other sites More sharing options...
flufrooster Posted December 8, 2014 Author Share Posted December 8, 2014 We have tested it all over the place. lol Link to comment Share on other sites More sharing options...
cruiser54 Posted December 8, 2014 Share Posted December 8, 2014 Index the distributor. Link to comment Share on other sites More sharing options...
flufrooster Posted December 9, 2014 Author Share Posted December 9, 2014 I'm done messing with the thing, posted it on craigslist. Someone with more knowledge can take over. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 9, 2014 Share Posted December 9, 2014 I'm done messing with the thing, posted it on craigslist. Someone with more knowledge can take over. craigslist where? Got a link? Link to comment Share on other sites More sharing options...
flufrooster Posted December 9, 2014 Author Share Posted December 9, 2014 I am working on getting pics on the ad http://nashville.craigslist.org/cto/4795046678.html Link to comment Share on other sites More sharing options...
Incommando Posted December 9, 2014 Share Posted December 9, 2014 In your list of things that you have not replaced is the coil itself. Just a few bucks off of Rock Auto. A timing light on the coil wire will show if its pulse is erratic. Link to comment Share on other sites More sharing options...
flufrooster Posted December 9, 2014 Author Share Posted December 9, 2014 Coil was replaced. Link to comment Share on other sites More sharing options...
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