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Old 09-29-2013, 04:34 PM   #1
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Exclamation In need of assistance

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Got a big issue to fix.
1987 Jeep YJ (AMC)
Engine: 1994 2.5 4 cylinder
Transmission: ax-5

The Scenario:
I'm headed down the highway from my riend's piano recital (the next Bach, or Mozart, or Beethoven). So I'm headed down the road, just really on the speed limit like a rebel when I notice I'm slowing down. Hot damn. What's going on, what's going on? I shift her down to fourth and hit the gas. Nothing. What the-? I think I'm coasting, so I don't release the clutch pedal. Still rolling, I hit the ignition and turn her over. Yep. The engine is dead. I begin to slow her down with the no-power-brakes and turn off the road with my no-power-steering and stop her there. We get her back to the house and begin a series of tests that tell us nothing.

I go to Basic Training. I return, a new man, a soldier. Jeep still broke.

My paw and I begin work on it. He diagnoses that it needs a new computer. Fair enough. We buy one. We get it. Find out it's two years older than the one we have. No worries, right? We'll see...

We plug it up and... DRUMROLL...
Nothing. No different.

In fact, the jeep's operation has been rather varied, and in some cases unpredictable.

The Problem:

No spark
Varied fuel. As of now: fuel is a go.

What we learned today:

When power is supplied to the under hood fuse block with ignition on, fuel pump primes and power is sent to the coil momentarily. Both the pump and coil power cut off at the same time. In some way, the ASD relay is involved, being there are only 3 relays in the fuse block beside the battery.

That is all I can think of for now. I will provide as much information as possible if anyone has any questions about it.

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Old 09-29-2013, 04:39 PM   #2
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So it died while driving? Before you start ripping things apart, start with the cheapest easiest stuff to fix.

I would start by checking your grounds and battery cables for corrosion/damage/disconnections. Does your computer get power? Can you get it to throw codes?

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Old 09-29-2013, 05:10 PM   #3
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Computer gets power, battery connections are very clean and solid. In, we just replaced them with much higher quality setups.

I have no check engine light. Isn't there a way to check codes by running a lightbulb between two pins and executing the 3 key turn process in order to make it display codes?
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Old 09-29-2013, 05:35 PM   #4
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The computers for 94's and 95's are specific and need to be matched to the serial number on the original ecu. Being that the computer is two years older and it's a 2.5 I am pretty sure that you do not have a match. From the onset of the tbi in 91 or so jeep worked through some hiccups with the set up and it was made much better in the 94/95 years, which are more sought after by those who are looking for reliability.
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computer , electrical , engine , fuel , pcm

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