1992 4.0 engine replacement with a 1999 4.0 | Page 2 | Ford Explorer Forums

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1992 4.0 engine replacement with a 1999 4.0

Well almost all of it's right...it's grey/red on 99 sensor to red on 94 truck. Everything else you got. I thought about putting that black to ground, but the other end just goes to ground, so I figured that would be redundant. I know it's gets a little confusing to stay on track.

I'm not positive if it was all right before because I just got the truck and it was only running on one bank. I also never ran it long enough to get it warm enough to even go into closed loop. It was spewing out pretty bad. However there wasn't a check engine light even when it was doing this with the old engine.
This was the title of the thread I found that leaves me to believe it may be a MAF sensor:
Engine hesitation & Code 172
 






That did it. Just got to put in a fresh MAF. I believe that the 99 cam sensor grounds through it's chassis, eliminating the need for a ground wire.
 






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