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Help me sort all this out on my engine swap.

 
  #1  
Old 10-17-2009, 09:19 PM
dreamison
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Help me sort all this out on my engine swap.

I have a 91 f150 4x4 with E4OD and now a 97 explorer 5.0. I used the truck manifold and related parts. While putting the new engine in I took the injector harness and MAF wiring and added it in my truck harness. I have a computer from a 95 Bronco that was equipped with 5.0 and E4OD to use with it. My first question is will the firing order of the explorer engine work with the injector firing order of the bronco computer or do I need to look for another solution. Second I am trying to figure out how to hook up power to the maf and also grounding the maf do i need to ground it to the computer ground or can I ground it locally some were.

Thanks for your help...
 
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Old 10-17-2009, 10:20 PM
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Assuming the Bronco computer is SEFI it will be the same firing order as the Explorer 5.0. MAF power and gnd should be sourced from the EEC to be consistent with all other sensors.
 
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Old 10-18-2009, 07:36 AM
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MAF power should come from the O2 sensor relay (or EEC relay/pin 37/57 on the computer if you do not have an O2 sensor relay), and ground should be to ground, not the sensor ground. There will be two signal wires that go to the computer.
 
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Old 10-18-2009, 10:17 AM
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Thanks for the help. Also do I need to run two o2 sensors or can I split the signal from the one I have and will I have to change the one I have to a heated o2 sensor I dont think the stock 91 sensor is heated.
 
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Old 10-18-2009, 10:39 AM
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You can split the single O2 sensor signal wire into both inputs on the computer. The original 91 O2 sensor should be a heated 3-wire sensor. The '95 may have used a 4-wire sensor, but I don't know how they would interchange.
 
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Old 10-18-2009, 11:26 AM
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The computer I have is a #F5TF-JB from a 95 bronco I though all 95's are SEFI. The fourth wire on the o2 sensor appears to go to the self test connector. Do i need to worry about that or can I just use my 3 wire o2 sensor I just installed it about three weeks ago.
 

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