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How to tell the difference between a 1993 and 1994 4.0L engine.

pjksr1955

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City, State
Williamstown, New Jersey
Year, Model & Trim Level
1990 Bronco 11
I bought a 4.0 engine with the wiring harness. The person told me it was from a 1993 explorer. Someone else told me that it was a 1994 because it has two o2 sensors in the y pipe. How can you tell the difference. I need to know because I want to put this engine into a Bronco II which I will need help with....
 


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YBCold

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Las Vegas NV
Year, Model & Trim Level
91 ×∟┬
in not sure. i dont see why it would have two o2 sensors in the Y. i think they have the same engine anyhow 4LV6 pushrod but there are minor differences.
 




snoranger

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City, State
Jackson, NJ
Year, Model & Trim Level
94 limited on 35's
Both '93 and '94 had two O2 sensors.
I think that 94 was the first year of the cam position sensor.
 




Turdle

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Humboldt, KS
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2000 Mounty
Yes, 93 is a confusing year of 3 possible combinations.

My 93 has 2 O2 sensors before the y pipe

94 has egr. Most 93 do not. The wiring to a cam sensor is also a good sign it is a 94. My 93 has no cam sensor wiring.

93 CA may have Egr and cam sensor wiring, so beware.
 




410Fortune

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NORTH IDAHO, 7B
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B2 "Slightly" Modified
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FOURTEN
only 91-92 have a single 02 sensor

93 does not have EGR or the cam sensor on the back of the lower intake, as Jon stated.

Only CA 93's had EGR and a cam sensor

It doesnt really matter, you can install a 93 block and heads into a 94 truck or vise versa
 




pjksr1955

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City, State
Williamstown, New Jersey
Year, Model & Trim Level
1990 Bronco 11
only 91-92 have a single 02 sensor

93 does not have EGR or the cam sensor on the back of the lower intake, as Jon stated.

Only CA 93's had EGR and a cam sensor

It doesnt really matter, you can install a 93 block and heads into a 94 truck or vise versa

I have a 1990 Bronco II and I have already installed the 4.0 engine and transmission. I am having concerns about the wiring. Can anybody help me with this. I am not sure if I have a 1993 or a 1994 engine. Not sure if it even matters what year it is. I COULD SURE USE SOME HELP........thank you
 




Vargas

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City, State
Seattle, WA
Year, Model & Trim Level
'94 EB & two '00 XLT
I have both a '93 XLT and a '94 EB. One oddity I have noticed is that the serpentine belt tensioner is positioned differently and pivots in the opposite direction. I was not aware of the added CPS on the '94, but its existence may be the reason the tensioner design was altered.
 




BrooklynBay

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