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Old 07-21-2010, 05:08 AM   #1
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ready to roll this thing in the lake!!!

Ok so heres my scenario. 1990 with a 4.2L and a 5speed. I just swapped out the carb from the carter to an mc2150. The carter didnt have ANY wires plugged into it and i know it was supposed to. Also the previous owner swapped out the distributor for some unknown looking thing and used the stock coil. I have in my hand a GM hei unit with top mount coil. Going to be swapping that in. Now my problem is the previous owner went nuts with wire cutters. I know that most of the computer controlled crap can be removed but how much? I am assuming that at this point there is absolutely no reason to have anything besides the starter the distributor to make it run???? I mean there is no more ignition module, sensors or anything to worry about. The only thing i cant seem to figure out is what i need for gauges. The only gauges that works on my dash is the fuel gauge and sometimes the volt meter will work but other times will not. What do i NEED to have hooked up to make the bare essentials function????:banghea d:

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Old 07-21-2010, 05:11 AM   #2
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Also another side note. If i let her sit for any more than 2 days the battery runs down. But theres really nothing hooked up at this point. I have a complete uncut harness that i grabbed up off ebay so i have a sort of idea what the plugs look like before the guy cut them all off...

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Old 07-21-2010, 06:33 AM   #3
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Tach wire will come off the "tach" lead on the dizzy. volt meter would be hooked to the batt or some point that can pick up the charge of the batt. coolet all you would need is the temp sensor to be in place and power to it(i think) oil pressure should have a canister on the pass side of the block below the coil should have a wire running from there to one side of the oil pressure gauge and the other should be power(i think)


i just got off work so im not really all here but hope this helps a little
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Old 07-21-2010, 06:49 AM   #4
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So in theory if nothing else is hooked up electrically after these few things the motor should run like it a dream? The tach lead I understand. Volt meter can go to any 12v source?? I see the canister type thing below the coil. It has 2 plugs on it? Is that it? And where is the coolant sensor? I am hoping that the cluster is just junk. Would I be better off just getting some cheap autometer gauges or something? Thanks for the help!
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Old 07-21-2010, 06:54 AM   #5
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So in theory if nothing else is hooked up electrically after these few things the motor should run like it a dream? The tach lead I understand. Volt meter can go to any 12v source?? I see the canister type thing below the coil. It has 2 plugs on it? Is that it? And where is the coolant sensor? I am hoping that the cluster is just junk. Would I be better off just getting some cheap autometer gauges or something? Thanks for the help!
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Old 07-21-2010, 07:08 AM   #6
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So in theory if nothing else is hooked up electrically after these few things the motor should run like it a dream? The tach lead I understand. Volt meter can go to any 12v source?? I see the canister type thing below the coil. It has 2 plugs on it? Is that it? And where is the coolant sensor? I am hoping that the cluster is just junk. Would I be better off just getting some cheap autometer gauges or something? Thanks for the help!
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Old 07-21-2010, 03:39 PM   #7
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I would not run the volt guage to the battery. Run it off the fuse panel or off the ign hot wire to get a system voltage reading. The battery will peg it out to 14+. The canister below the coil(oil pressure sending unit) should have 2 wires and is a sensor not a relay, it is read by ohms not voltage. The TCU,temp control unit, will either be in your thermostat housing or in the back of the block by #6 piston.. I can't remember rite off hand on the 90 4.2.
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Old 07-21-2010, 06:06 PM   #8
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Ok. The canister below the coil has 2 plugs in it I believe. At least one of the plugs has 2 wires I know for sure but I forget about the other one. One plug is in the side and one on top of that canister. And as far as the coolant temp sensor the only thing I can find is a sensor on the top of the motor towards the back to the driver side of the valve cover and it has a like pin on top that the single wire sits on. Still not sure about the volt meter. I don't see any reason why it couldn't just be hooked to any switched 12v circuit. Thanks for everyones help. And sorry for the 3 repeat posts. I must have hit the button too many times or somethin. Lol
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Old 07-21-2010, 08:44 PM   #9
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Quote:
Originally Posted by gearhed42 View Post
And as far as the coolant temp sensor the only thing I can find is a sensor on the top of the motor towards the back to the driver side of the valve cover and it has a like pin on top that the single wire sits on.
That's it. I have a 90 YJ as well.
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Old 07-22-2010, 04:26 AM   #10
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Ok so temp sensor found. Whats the deal with the oil pressure sensor? I looked up the part online and seems to show only one plug. Mine definately has one out the top and one out the side. Also is there any way of testing these sensors to rule out that its the gauge not the sensor? And nobody has really answered either way whether this is all i need to run smoothly.... do i need anything else hooked up? Thanks everybody!
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Old 07-22-2010, 09:34 AM   #11
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Originally Posted by gearhed42 View Post
Ok so temp sensor found. Whats the deal with the oil pressure sensor? I looked up the part online and seems to show only one plug. Mine definately has one out the top and one out the side. Also is there any way of testing these sensors to rule out that its the gauge not the sensor? And nobody has really answered either way whether this is all i need to run smoothly.... do i need anything else hooked up? Thanks everybody!
i don't know what all needs to be hooked up to make it run bare minimum, etc. I do have a 90 6cl 5spd stock. so if you need a pic of under the hood, I might be able to help out. as long as you don't mind seeing a lot of stuff with grease on it
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Old 07-22-2010, 03:52 PM   #12
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as far as your gauges go... pull out your gauge cluster and clean all connections if needed flow some solder on the copper connections on the flex circuit do so. should get most of your gauges working.
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Old 07-22-2010, 09:11 PM   #13
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I had read a little about that problem with the gauges. Initially i pulled them out and took a look but didnt see any signs of any corrosion. I cleaned them up a bit but made no difference. But i guess that it something to look at again. I am more concerned with making sure that i dont need some misc. sensor hooked up or something that may cause a driveability problem. Initially i started out with the jeep running ok but seemed underpowered and had almost a miss but sounded more like a sporatic "puff" of air. So i swapped the carb which made absolutely no improvement. Now i am changing the distributor because the local shop i deal with (who happens to build jeep rigs pretty sweet website to check out also it is Domenic's Auto & Jeep Repair — Home Page ) he had no idea what the previous owner put in it for a distributor and thought that an HEI swap may add some extra spark and cleaner spark to clean up how she runs. But i just want to make sure i am not missing something that could cause it to run like this....
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Old 07-23-2010, 05:48 AM   #14
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anybody?
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Old 07-23-2010, 07:59 PM   #15
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first thing gauges my volt meter does the same thing just hit it once and awhile should pop back on. welcome to owning a jeep,the oil pressure switch is not worth the time its a pita to get out and not worth the time. next the running crappy other the the dist being weird is their any other things out of place. chances are the po had it nuttered and thats why your not feeling a change. also check your exhaust manifold for leaks, that puff you hear could be a leak in the exhaust manifold.

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