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Old 08-19-2014, 10:15 PM   #1
Join Date: Aug 2014
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93 YJ won't start

I began to have transmission issues roughly three months ago. I didn't have the funds to fix it till recently and had it covered under a tarp in the mean time. A few weeks ago I tried to start it just so it can run for a bit and the starter would go but the the jeep wouldn't run. After charging the battery for 30 min it struggled but was eventually able to get going again. Fast forward a few weeks later everything tranny/transfer case was rebuilt and back in place and when I would turn the key the lights and radio would turn on but the fuel pump didn't make its typical buzzing noise indicating it was engaged and the starter wouldn't even attempt to move. Tried charging the battery again and though it's showing 12v still nothing.
We found that we could manually engage the starter with a screwdriver, while it was still attached to the jeep, but the engine would not run. It turns out the started had a wire that had broke free during the removal of the tranny and after correcting this the starter would go, with the key, but still engine would not run.
After checking fuses/relays and replacing the ignition switch the problem persists. The jeep ran fine before the tranny issues and the fuel pump had been replaced (new) roughly a year and few months ago. Though it hasn't been dropped and checked I have a feeling it's not the pump as the starter would not engage as well but was getting power noted by manually doing so and the wire fix has solved that issue. We tried starter fluid in the intake to see if we could get some action from the engine but nothing. Using a nipple on the engine we discovered fuel was getting to it after replacing the switch cause pressing on it had fuel squirt out after turning the key from off to on a few times and now we can hear the pump engage on key turn.
We are running out of theory's of what the problem could be and I wanted input from others on what can be done before I take it to someone.
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Old 08-19-2014, 11:14 PM   #2
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Start with the basics, sounds like you have focused on fuel to the rail but are the injectors actually firing? What about ignition? Could a ground strap be disconnected from the transmission work such that you are not getting power to the ECM?

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Old 08-20-2014, 11:27 AM   #3
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Look at the trans bell housing at about the 11 oclock position. There is a CPS sensor there, if its damaged the least little bit this will cause the ignition/spark part of the cycle not to work. The crank position sensor...telks the computer hey im turning start sending spark. You may have damaged it while removing/installing the trans.
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