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4.0 Blown ECM

rdubs

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1993
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So not too long ago I finished changing the 4.0 in my '93 4x4 ranger.
The engine I got to replace it was from a '92 ranger. The only visible
difference I could see when I swapped the two was that the '92 had 1 O2 sensor and the '93 had 2 O2 sensors.


After I got everything connected it started right up on the first crank. It ran rough at first but as I fixed the vacuum leaks and got new gas running through it, it started to smooth out. As I drove it around it had a small miss but no check engine, as it warmed up it would smooth out even better.

The main problem was that it had a really bad miss when I got on it. It would continue accelerating almost normally but start making a loud blub blub blub blub out the exhaust until I let off the gas. After driving it a few weeks I started it up and it died when I put it in reverse. Right after it died I smelt a burnt electric smell. It had spark and started with ether, so I bypassed the fuel inertia switch and all that crap and it would not start with roughly 37 psi of fuel pressure.

So then I took out the ECM, it smelled burnt. When I opened it up the inside was covered in soot and there was some burnt components. The wires going into my Crankshaft sensor were bare and touching each other, Possible culprit for ECM failure?

So I need to know if those shorted wires could have been what caused the problem? Also what ECM do I need to get as a replacement. I heard that the 1990-1992 had different injectors than the 1993, so should I get a 1992 ECM and just leave one of my O2 sensors unplugged? Or would the 1993 be the best to go with all the other systems in the truck? Also does the fact that it is a 4x4 change anything? I am pretty sure the 1994 won't work because I believe they added EGR that year.

I know I wrote this long post but hopefully it will help you help me.
Any thoughts would be greatly appreciated!!!
 


adsm08

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The CKP wires shorted together like that could certainly do damage to the computer. I don't know about different injectors. I am currently running a 92 engine with a 94 computer and I have no real issues. It runs fine once the computer realizes the cam sensor isn't there (yet).

4x4 or not does not matter because the computer doesn't need to know that.
 

RangerSVT

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Last edited:

rdubs

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Thanks alot for your responses.

I guess I'll just get one from a '93.

My broke one has the code 'RAT1', I guess the its not that big of a deal if they match or not?

Thanks for the link SVT
 

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