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OEM 258 intake question

Discussion in 'Jeep CJ' started by Duff, Jan 12, 2020.

  1. Jan 12, 2020 at 12:42 PM
    #1
    Duff

    Duff [OP] Active Member

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    Getting the head redone on my 85 CJ, so I have the manifolds off. On the bottom of the factory aluminum intake there is a plate that has 3 bolts and an orange wire going to it. The orange wire was cut long ago, so I'm not planning on hooking it up. Just curious what it's for? EGR? cold weather preheat for carb?
     
  2. Jan 12, 2020 at 1:05 PM
    #2
    Jim Beam

    Jim Beam Well-Known Member

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    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    Yes, that is for a fuel mixture preheater. I am sure it has a lot to do with emissions. I removed mine so I could attach a mechanical coolant temp sensor into the intake manifold port that the wire goes into. One issue I had with the removal of the exhaust manifold was that it was warped and I had issues with bolt hole alignment during installation.
     
  3. Jan 12, 2020 at 3:01 PM
    #3
    Duff

    Duff [OP] Active Member

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    I'm going to leave it unhooked and in place, as long as it doesn't cause me any trouble. Thanks for the heads up on the warped exhaust manifold. I'll fit mine up before I spend any $$ on getting it baked and sensor holes plugged, hopefully won't have to get a new one. I'm having the head checked for warpage and the valve cover bolt holes tapped. Also, on the firewall, right behind the valve cover is a stud sticking out with a nut attached, it's kinda in the way when installing the aluminum cover. What is it? Heater box brace? I'm going to shorten it or move it over.
     
  4. Jan 12, 2020 at 6:10 PM
    #4
    Jim Beam

    Jim Beam Well-Known Member

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    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    I don't seem to have that stud on my '86, so I am not sure what it is for. There are a few cables up against the fire wall and it could be used to support one of those. By the way, you should have a fair amount of clearance between the valve cover and the firewall, if not it could indicate that your motor mounts are sagging, I have about an inch and a half. Although I do have the "bomb proof" motor mounts made by Mountian Off Road and they cost a fortune. Another indicator of bad motor mounts would be that the clutch linkage bellcrank is not perpendicular to the frame, again caused by motor mounts sagging. This can overstress the bellcrank pivot on the clutch bellhousing and break it.
     
  5. Jan 12, 2020 at 6:59 PM
    #5
    Duff

    Duff [OP] Active Member

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    Here's what's there.It's hard to tell in pictures, but I don't have a lot of clearance back there and the stud isn't helping. The jeep did have factory AC, so the stud may be something for that? I just deleted the AC and replaced the engine mounts with Energy Suspension ones. Looks to me like the engine is tilted back a bit and I know the T case/belly pan has some issues. The trans was changed to a T176 and the belly pan is probably for a different year? The pan/mount has been cut and welded on in order to fit the mount. So, this may be causing the clearance problem. I'm looking at a universal weld in tubular crossmember that fits above the skid plate, I think it's made by GenRight and sold by a few vendors. JeepFirewall2.jpg JeepFirewall1.jpg
     
  6. Jan 12, 2020 at 9:18 PM
    #6
    Jim Beam

    Jim Beam Well-Known Member

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    1986 CJ7
    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    Another possible way to get some more clearance in there would be to push the body back on the frame. This can be done by loosening all the body mount bolts and shoving the body back a bit, It does sound a bit bizzare though. Maybe you could get more help by sawing off that stud that protrudes beyond the nut, or just deal with what you have. The T176 tranny did come with the 1980 CJ, There is an aftermarket skid plate/tranny mount made:https://content.invisioncic.com/r24...tom).jpg.6919910ec05b8c023a740bb57e60ddfb.jpg
     
  7. Jan 13, 2020 at 4:53 AM
    #7
    Duff

    Duff [OP] Active Member

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    Now that the AC is out of the way, I can go behind the dash and see what that stud is for, I'll either trim it down or move it over some. Thanks for the info on the tranny mount. I'll post results in a few weeks.
     
  8. Feb 10, 2020 at 3:17 PM
    #8
    Duff

    Duff [OP] Active Member

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    I'm going to install the intake soon and am thinking about just cutting the spikes off this pre heater. Bad idea?
     

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