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Old 11-29-2010, 12:03 PM   #1
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Need help 4.2L coil And Distributor ?

So im helping a friend fix his jeep. He has a 1988 YJ with a older model 4.2L. The tricky part is somehow he messed up his distributor by spraying WD-40 in it and now it wont start. I looked up a new distributor and it doesnt look anything like the one in the pic. The one he has has points and a condenser. I tryed posting in the YJ forum but i recieved no luck. My ? is where does the wire go too, that comes out of the distributor, its black and i think it used to have an eyelet connector on it that sat between the Cap and the Distributor(as a ground?) then it is connected to the negative side of the Coil. Does this seem right? Im thinking the Points are shot and i plan on replacing them. If anyone knows where the negative side of the coil is supposed to be hooked up to I would greatly appreciate it

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Old 11-29-2010, 03:25 PM   #2
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Can i just put a HEI distributor in this and call it a day?

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Old 11-29-2010, 03:35 PM   #3
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Yup, then you can delete the brain box, coil, and factory wiring crap too
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Old 11-29-2010, 03:39 PM   #4
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If I were him, I would swap out the old guts for a Pertronix Electronic Ignition setup. I did this with my '68 Mustang and it works great.

The above route would be a worthwhile upgrade over the points style ignition that it has.

Along with that, I would replace the cap and rotor....They don't cost much.
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Old 11-29-2010, 03:43 PM   #5
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Pertronix work good, but when you can get an whole HEI dizzy for 50 bucks....your better off going that way for sure
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Old 11-29-2010, 03:45 PM   #6
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Quote:
Originally Posted by Ibuildembig View Post
Pertronix work good, but when you can get an whole HEI dizzy for 50 bucks....your better off going that way for sure
Agreed. It really depends on what the OP wants to do.
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Old 11-30-2010, 06:16 AM   #7
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we ordered him a CRT HEI distributor. Anyone ever here of that brand. Its 150.00 with the new spark plug wires.
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Old 12-13-2010, 02:23 PM   #8
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So we finally got the HEI distributor in and I timed it just how the instructions told me too. The jeep Runs great now, and it just dropped right in. I only have one concern with it. After driving it all over town when my friend goes to shut it off. Sometimes the engine Backfires really loud? Do i have to adjust anything on the carb or what causes it to backfire only when you turn the key off?
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Old 12-13-2010, 02:25 PM   #9
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Is the timing right? Also, it might be causing a spike in voltage when he shuts the key off; making the dizzy fire one more time. Change the 12v switched wire on the dizzy to something else and see if it goes away
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Old 12-14-2010, 12:02 PM   #10
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I used the yellow wire that originally went to the Positive side of the old coil. I believe it comes out of the ICM. I used my DMM and found that when the key is in the run position i have 12V. Ill try retiming it when its hot and see what happens. Does anyone know which port on the carburetor the Vac Advance is supposed to be attatched too? I have the Vacuum diagram but it doesnt show me which port. Im not familiar with that type of carb.

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