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Thread: Rebuilding motor need help With stiffness

  1. #51

    BIGROB's Avatar
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    Quote Originally Posted by Jordanmartinchr View Post
    I'm sorry lol I'm a broke 19 trying to learn kinda how to do some things on my own as far as motors go.
    How do people get away running straight pipes where there is no gas change from upper to rear o2 sensor?
    It's OK, you gots to learn somehow. Searching and reading will help.
    https://auto.howstuffworks.com/question257.htm

    As NitroRam said, forget about the two downstream sensors. They are not important, leave them plugged into the harness and tie them up to the frame rails.
    The two upstream (first in line on the down pipes) sensors are the important ones. With out those the ECM will be thinking WTF and be all like LMFAO and ROTFLMAO. Sorry, I can't speak 19 year old.

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  2. #52
    nitroram33's Avatar
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    With the '98 truck, there's actually only one downstream O2 and three upstreams lol, one in each downpipe and one just before the cat.

  3. #53

    BIGROB's Avatar
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    You're right. I was thinking of my 03' with two up and two down.

    Project Maverick. I feel the need, the need for speed

  4. #54

    9t9-5.2's Avatar
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    Quote Originally Posted by Jordanmartinchr View Post
    I'm sorry lol I'm a broke 19 trying to learn kinda how to do some things on my own as far as motors go.
    How do people get away running straight pipes where there is no gas change from upper to rear o2 sensor?
    Best reason to keep asking questions. It is usually the do-overs that end up costly.

    "We got no fear no doubt all in balls out"

  5. #55
    Jordanmartinchr's Avatar
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    Quote Originally Posted by nitroram33 View Post
    You misunderstand, there are FOUR (4) O2 sensors with a '98 5.9 truck and 2 with the other '98 trucks. Only one of them on each truck is what you're thinking about and is the after-cat O2 that doesn't really do much. The others are before the cat and is what determines all your fuel trims. Without the pre-cat O2(s) the PCM is going to see no sensors and light up like a Christmas tree and run like dogshit because it will just assume it's crazy lean and throw extra fuel at it.
    So basically I'd have to get the pin out for the extra 02 sensor coming from the computer and mount another 02 sensor upstream on the side that doesn't have it in order for it to work unless I just get 5.2 pcm?

    And what exactly would happen if I only left my single 02 sensor wired up and the other disconnected? Would that start the wtf moment with the computer still?
    Last edited by Jordanmartinchr; 01-16-2018 at 09:26 PM.

  6. #56
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    Quote Originally Posted by Jordanmartinchr View Post
    So basically I'd have to get the pin out for the extra 02 sensor coming from the computer and mount another 02 sensor upstream on the side that doesn't have it in order for it to work unless I just get 5.2 pcm?

    And what exactly would happen if I only left my single 02 sensor wired up and the other disconnected? Would that start the wtf moment with the computer still?
    The '98 5.9L PCM wants all 3 upstream O2s or it freaks out. Get a 5.2L PCM, wire in the injector wires, and then you're done.

  7. #57
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    Quote Originally Posted by BIGROB View Post
    You're right. I was thinking of my 03' with two up and two down.
    Yep, only 1 cat on the '98s too.

  8. #58
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    I'ld hate to add confusion to everything. But you can get by with no o2s plugged in. The ecm will default off of pre saved fuel tables. I ran mine like this for a little while and the afr was pretty damn close. But for the little extra work I would definitely get both pre cat o2s installed and wired. You'll get better fuel mileage and friendlier idle/ street manners.

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    This thread has delivered
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  10. #60
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    Anyone have a 98 5.2 2wd dakota pcm??

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