1999 Wrangler 2.5 won't start after motor replacement. - Jeep Wrangler Forum
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Old 05-01-2013, 11:22 AM   #1
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1999 Wrangler 2.5 won't start after motor replacement.

I just replaced the 2.5l in my 99 Wrangler. I bought an ATK motor, replaced the starter, coil, distributor, alternator, plugs, wires, clutch, etc. After getting everything installed, and all fluids filled, I put #1 on top dead center. Checked the rotor button and it was on #1 point. Buttoned everything up and, it won't start. It turns over, has fuel, and fire so I know that my Crank and cam shaft position sensors are working or it wouldn't have fire. Any ideas?

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Old 05-01-2013, 12:59 PM   #2
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Does it try to start or just spin?

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Old 05-01-2013, 01:00 PM   #3
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Old 05-01-2013, 01:01 PM   #4
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When I put my replacement engine in mine I first put the distributor in 180 degrees out... Try moving the plug wires around two spots and see if it starts?
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Old 05-01-2013, 01:48 PM   #5
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It turns over strong, but just won't start ( just spins). I tried rotating the distributor 180deg. but it was no good. So I put #1 back on TDC, and made sure the rotor button was in place. it was about 2 teeth off. put it in place and no go. I know the computer does the adjusting, but it has to run first. I figured if it was just a little off it would still start. I'm just a shadetree-er, and my diagnostic skills have hit their max without some kind of guidance.
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Old 05-01-2013, 01:57 PM   #6
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make sure your at TDC of the compresion stroke, not the exaust stroke. Thats the easiest way to make sure your not 180 out. If you can pull the rocker cover you can watch the valves. Intake should open on the way down, then both stay closed as it comes back up. Thats TDC of the fire stroke where you want to be. Opposing would mean the exhaust valve is open on the way back up, then at the top as it closes and the intake opens w/it. You don't get good compression or fire at that point. Has to be TDC after compression stroke up, before fire stroke back down.
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Old 05-01-2013, 03:47 PM   #7
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Thanks man, I'll try that. I won't be back to work on it till Friday but I'll try that.
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Old 05-01-2013, 04:40 PM   #8
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The computer will adjust the spark but that is from the crank sensor (& the proper flywheel is needed). The distributor has the cam sensor which is for the injector timing. Turning the distributor has nothing to do with ignition timing. However, if the crank/cam sensors are not in proper sync, it won’t start. Most important make sure you are on #1 compression stroke as mentioned above then refer to the FSM, one linked below if you don’t have one, for proper distributor installation involving a toothpick. Also note there are 2 positions, 4 cyl & 6 cyl. Make sure you have that right. That info is in the Ignition System chapter on about page 14.

See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
Pick your model & year then on the drop down menu pick the chapter you need.
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Old 05-03-2013, 10:05 PM   #9
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Well thanks for the help, I was a tooth off on the timing. It fired up, I started the break in, by the book, started to pull it out of the shop and the top end started knocking. So now I have to go through the warranty process. Thank god for warranties.
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Old 05-04-2013, 07:22 AM   #10
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Quote:
Originally Posted by Zebulon View Post
Well thanks for the help, I was a tooth off on the timing. It fired up, I started the break in, by the book, started to pull it out of the shop and the top end started knocking. So now I have to go through the warranty process. Thank god for warranties.
Man that sucks I hope they take care of you quickly

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