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Thread: New ZJ in the family

  1. #11
    Hooked Five-N9ne's Avatar
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    Another one! I'm not the only one

    Pop the throttle butterflies open and shine a flashlight down the bore into the intake. The plenum gaskets go on these motors and suck oil out of the lifter valley. Oftentimes that oil can cause rough idling. Also check the coolant temp sensor, sometimes it'll still read on the dash but cause issues and keep the computer in closed loop as it defaults to thinking the motor is -40 degrees.

    I've dealt with the Magnum motors a lot, if you have any questions about the motor or the trans shoot me a message! Also, do yourself a favor and look into swapping out that 249 with either a 242 (the better option) or a 231. The viscous coupling in the 249's goes in the early models and can creep while in park and/or just fail altogether. 242 is the better option with the V8, despite what 99% of unibody people will tell you. You'll need to make sure the donor case is from a 95 or older, as the input shaft lengths changed in 96. There's ways to back-half the case and reuse your 249 front housing with a newer 242, there's a writeup I can point you towards.
    '98 5.9 LX Grand Cherokee: 6.0 Mopar, mild trans build, 242 case swap

  2. #12
    Nothing but a Thing Strodinator's Avatar
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    Quote Originally Posted by Five-N9ne View Post
    Another one! I'm not the only one

    Pop the throttle butterflies open and shine a flashlight down the bore into the intake. The plenum gaskets go on these motors and suck oil out of the lifter valley. Oftentimes that oil can cause rough idling. Also check the coolant temp sensor, sometimes it'll still read on the dash but cause issues and keep the computer in closed loop as it defaults to thinking the motor is -40 degrees.

    I've dealt with the Magnum motors a lot, if you have any questions about the motor or the trans shoot me a message! Also, do yourself a favor and look into swapping out that 249 with either a 242 (the better option) or a 231. The viscous coupling in the 249's goes in the early models and can creep while in park and/or just fail altogether. 242 is the better option with the V8, despite what 99% of unibody people will tell you. You'll need to make sure the donor case is from a 95 or older, as the input shaft lengths changed in 96. There's ways to back-half the case and reuse your 249 front housing with a newer 242, there's a writeup I can point you towards.
    Thanks for the input! I think the plenum gasket may have failed just based on the fact that I can consistently smell burning oil. I won't even start on it until my other Jeep is done. I do like the transfer case for now but as soon as I lift it I'm going to find a way to get my spare 231 to fit the bill. The new pcv valve helped stop the stalling but the idle is still a little lower than I'd like (550-650) sometimes

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  3. #13
    Nothing but a Thing Strodinator's Avatar
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    Quote Originally Posted by Five-N9ne View Post
    Another one! I'm not the only one

    Pop the throttle butterflies open and shine a flashlight down the bore into the intake. The plenum gaskets go on these motors and suck oil out of the lifter valley. Oftentimes that oil can cause rough idling. Also check the coolant temp sensor, sometimes it'll still read on the dash but cause issues and keep the computer in closed loop as it defaults to thinking the motor is -40 degrees.

    I've dealt with the Magnum motors a lot, if you have any questions about the motor or the trans shoot me a message! Also, do yourself a favor and look into swapping out that 249 with either a 242 (the better option) or a 231. The viscous coupling in the 249's goes in the early models and can creep while in park and/or just fail altogether. 242 is the better option with the V8, despite what 99% of unibody people will tell you. You'll need to make sure the donor case is from a 95 or older, as the input shaft lengths changed in 96. There's ways to back-half the case and reuse your 249 front housing with a newer 242, there's a writeup I can point you towards.
    Just checked back into your thread! You're getting real close. I got real lucky with the body on mine too. 1250 and the only body damage is minimal paint chipping on the front bumper. No rips in the leather seating so I added seat protectors to be safe after I conditioned it 😂. Gotta be safe.

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  4. #14
    Hooked Five-N9ne's Avatar
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    Do yourself a favor if you want to use a 231, look into internal upgrades. They’ll usually hold up to light wheeling and such but the torque can sometimes stretch the chain. I think it’s S10s that have a 231 variant with a bigger chain.

    Edit: is your 231 the right input shaft length?
    Last edited by Five-N9ne; 04-08-2018 at 03:17 PM.
    '98 5.9 LX Grand Cherokee: 6.0 Mopar, mild trans build, 242 case swap

  5. #15
    Nothing but a Thing Strodinator's Avatar
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    Quote Originally Posted by Five-N9ne View Post
    Do yourself a favor if you want to use a 231, look into internal upgrades. They’ll usually hold up to light wheeling and such but the torque can sometimes stretch the chain. I think it’s S10s that have a 231 variant with a bigger chain.

    Edit: is your 231 the right input shaft length?
    I'd have to swap the input shaft on the 231 I have since it's from a TJ.

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  6. #16
    Nothing but a Thing Strodinator's Avatar
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    Some poser shots. Was cleaning the back patio and realized the edge of the concrete is great for flex testing. IMG_20180418_165816.jpgIMG_20180418_165821.jpgIMG_20180418_165830.jpgIMG_20180418_165845.jpgIMG_20180418_165857.jpg. She tucked up real nice. Almost makes me want to keep her stock for a while.

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  7. #17
    Hooked Five-N9ne's Avatar
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    Haha nice!

    I have a stock set of later injectors laying around if you want them, they upped them to 24# in 1996. Plug and play.
    '98 5.9 LX Grand Cherokee: 6.0 Mopar, mild trans build, 242 case swap

  8. #18
    Nothing but a Thing Strodinator's Avatar
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    Quote Originally Posted by Five-N9ne View Post
    Haha nice!

    I have a stock set of later injectors laying around if you want them, they upped them to 24# in 1996. Plug and play.
    I might just take you up on that! What do you want for them?

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  9. #19
    Nothing but a Thing Strodinator's Avatar
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    Two questions for ya guys. First of all what do you recommend I do front bumper wise? There's no way in hell I'm buying one since aftermarket is outrageously expensive however I would like to mount a winch and get that ugly faschia off of there. Second question is since I want to keep the transfer case, what driveshaft can I use to eliminate the rzeppa at the axle? It has the double cardan at the transfer so the yoke there is good. I'm hoping for a junkyard fix however I might end up going with this Screenshot_20180419-223209.jpg

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  10. #20
    Hooked Five-N9ne's Avatar
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    Stock XJ front shaft can fit.

    As to the bumper, JCR has a decent one. The problem with ZJs is putting winch bumpers make them look like Jay Leno’s chin. JCR has the lowest profile that still saves you some approach angle.
    '98 5.9 LX Grand Cherokee: 6.0 Mopar, mild trans build, 242 case swap

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