no start no ecm -

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post #1 of 8 Old 06-27-2011, 05:43 PM Thread Starter
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no start no ecm

Ok just to start I am new to jeep but have been working on cars all of my life. I just bought a 93 wrangler 4.0 5 speed that the last owner had decided that fuel pump had failed on. He removed the fuel pump and tank installed the new fuel pump in the tank and never reinstalled the tank. I reinstalled the tank added 5 gallons of fresh fuel and cranked it over. cranks but doesn't even try to start. still has no fuel pressure has no spark and i can't check the codes the check engine light never comes on. What wire signals the engine control module to turn on. Are there any real common issues that I should look for causing my concern.

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post #2 of 8 Old 06-27-2011, 06:03 PM
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So a search for brain surgery. From what you described it sounds like the capacitors in the ecm are bad.
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post #3 of 8 Old 06-27-2011, 08:21 PM Thread Starter
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i was reading about the ecm repairs but it was listed as for a 4.2 liter and posted by a guy that had a 2.5 liter in his signature so I wasn't sure if it applied to the 4.0 liter
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post #4 of 8 Old 07-02-2011, 01:09 PM Thread Starter
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So after a lot of searching I found the cold start write up that tells you how to test for a failed pcm. during the tests I found there was no fuse in the dome space and this resolved the no check engine light. Now I hear the fuel pump prime and i have spark. the problem i am still running in to is i have no fuel pressure. I removed the filter and have no flow there either. The previous owner had remove the tank to replace the fuel pump. When i got the jeep he had cleaned the tank and installed a new sender and pump assembly but never put the tank back in. I started buy putting the tank back in and then found it would still not start. the wires on the sender didn't have a connector on them just pins. I connected the wires ar the diagram showed. orange and black to the orange on the pump blue to the brown going to the sender and the green to the ground. do i have them hooked up wrong the pump is sucking not pumping.
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post #5 of 8 Old 07-02-2011, 01:25 PM
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Jumper the fuel pump wires and see if you get fuel at the engine.

If you have fuel and no spark, inspect the CranKshaft Position Sensor (CPS) wires/connectors and test the CPS for failure.

Inspect the Camshaft Position Sensor also.


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post #6 of 8 Old 07-02-2011, 01:34 PM Thread Starter
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I jumped the relay and the pump runs just doen't pump anything
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post #7 of 8 Old 07-02-2011, 02:16 PM
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Originally Posted by jermyjudge View Post
I jumped the relay and the pump runs just doen't pump anything
Have you checked the lines? I've seen a few posts where people have pinched lines when putting the tank back in. I would also try to test the pump out of the tank to make sure it is pumping fuel. Not positive but I think I also read a similar post was somehow related to a ground.

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post #8 of 8 Old 07-02-2011, 05:25 PM
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If you have the fuel filter disconnected and no pressure from the pump, it's either a bad pump or the wires are backwards. Did the P.O change just the pump or the whole sending unit? It's possible that it's kinked but from the sounds of it you'd have seen that before posting.

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