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Unread 08-15-2013, 12:02 PM   #391
Gigemags05
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You mean the sensor that the gauge plugs into on the back of the head?

Or the sensor in the thermostat housing?

I'll definitely give that a shot.

Can anyone direct me to a link or any info on checking the pickup tube/ fuel sock in the tank? Is it possible that its partly clogged?

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Unread 08-15-2013, 03:12 PM   #392
NelsonATC
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Thermostat housing.
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Unread 08-17-2013, 03:32 PM   #393
Gigemags05
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I replaced the coolant temp sensor with no luck.

I put a fuel pressure tester on it and its holding around 35-40 at all times, even when it's dying.

Is there any chance I have the cps gap too wide or too narrow?

I'm out of ideas on this thing.
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Unread 08-17-2013, 03:41 PM   #394
Skerr
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Quote:
Originally Posted by Gigemags05 View Post
I replaced the coolant temp sensor with no luck.

I put a fuel pressure tester on it and its holding around 35-40 at all times, even when it's dying.

Is there any chance I have the cps gap too wide or too narrow?

I'm out of ideas on this thing.
We just broke into the 4.0 world so I don't know much! If it is pointing to the CPS, could it be loose? We gapped ours with cardboard from a cereal box.
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Clay's Build Thread
http://www.jeepforum.com/forum/f8/cl...hread-1061897/
Scott's Build Thread
http://www.jeepforum.com/forum/f8/sc...5-cj7-1147913/
Fallon (and Dad) Build Thread
http://www.jeepforum.com/forum/f11/f...-okee-1445206/
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Unread 08-17-2013, 03:48 PM   #395
Gigemags05
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It's on nice and tight. It starts up and runs fine so I'm doubting its the gap, just grasping for straws.
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Unread 08-17-2013, 03:56 PM   #396
Skerr
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Quote:
Originally Posted by Gigemags05 View Post
It's on nice and tight. It starts up and runs fine so I'm doubting its the gap, just grasping for straws.
And I am throwing them at you!! Good luck.
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"Contemplate the mangled bodies of your countrymen, and then say 'what should be the reward of such sacrifices?' ... If ye love wealth better than liberty, the tranquility of servitude than the animated contest of freedom, go from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains sit lightly upon you, and may posterity forget that you were our countrymen!" —Samuel Adams

Clay's Build Thread
http://www.jeepforum.com/forum/f8/cl...hread-1061897/
Scott's Build Thread
http://www.jeepforum.com/forum/f8/sc...5-cj7-1147913/
Fallon (and Dad) Build Thread
http://www.jeepforum.com/forum/f11/f...-okee-1445206/
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Unread 09-15-2013, 08:20 PM   #397
sfeather11
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EGR or not?

Hi all, started this swap project about 6 years ago, then kids came along. Well, finally getting back into it and had a question. I've got my '95 head sitting on my '82 block. I re-used my 258 intake and am using the exhaust manifold from the 4.0. I am undecided on whether to use the Howell TBI kit or an MC2100 carb. Has anyone else with this intake/exhaust manifold setup hooked up their EGR? If so, what tube did you use? I cannot use my original since the 4.0 head is a little taller. Do I actually even need EGR? What would be the effects if I just plugged the holes?

Peace!
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Unread 09-16-2013, 07:12 PM   #398
sfeather11
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Hi all, disregard the above post. After searching a bit I found an awesome thread about EGRs. After reading, I decided I will not be hooking it up, so the question is moot!

Peace!
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Unread 12-24-2013, 08:33 AM   #399
captkhaos
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Hello,
I've read every (well almost every) post of the 398 of them on this thread but have not found the answer I am looking for. Yes, I did a search. I have a 1980 CJ7 with a 258 and have a 4.0 head ready to go. The only thing stopping me is the exhaust header. I have had 3 engines in this Jeep during the 30 years I've owned it and had headers on all of them. Besides the cam, the header seems to make the most difference. I have found very little reference here about headers (or cams) but I don't want to start the swap until I have the right one... especially if I'm gonna pay $500 + for a Borla etc. Can anyone PLEASE give me some advice on a known working header for a 4.0 in a CJ7?

BTW, My 258 (4.2) runs great with a Crane RV cam, Crane ignition and a cheap Hooker header. The Carter BBD is a POS and the 258 really came alive with a Holley 350 cfm 2 bbl. Very easy install. The 4.0 head requires 390 cfm though so I went with a Weber 38/38. I'll consider TBI after I get it running with the new head. Trick Flow makes the 7/16" bushings for the head bolts. Expensive though. I'll look into the copper pipe idea. Thanks for all the help. Merry Christmas!! Dan
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Unread 12-24-2013, 08:41 AM   #400
billybooster2
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Quote:
Originally Posted by captkhaos View Post
Hello,
I've read every (well almost every) post of the 398 of them on this thread but have not found the answer I am looking for. Yes, I did a search. I have a 1980 CJ7 with a 258 and have a 4.0 head ready to go. The only thing stopping me is the exhaust header. I have had 3 engines in this Jeep during the 30 years I've owned it and had headers on all of them. Besides the cam, the header seems to make the most difference. I have found very little reference here about headers (or cams) but I don't want to start the swap until I have the right one... especially if I'm gonna pay $500 + for a Borla etc. Can anyone PLEASE give me some advice on a known working header for a 4.0 in a CJ7?

BTW, My 258 (4.2) runs great with a Crane RV cam, Crane ignition and a cheap Hooker header. The Carter BBD is a POS and the 258 really came alive with a Holley 350 cfm 2 bbl. Very easy install. The 4.0 head requires 390 cfm though so I went with a Weber 38/38. I'll consider TBI after I get it running with the new head. Trick Flow makes the 7/16" bushings for the head bolts. Expensive though. I'll look into the copper pipe idea. Thanks for all the help. Merry Christmas!! Dan

I went with this one from kospeed on ebay. Runs great, not Borla but less $$$ too! Have you upgraded the injectors to the '703' 4 hole pintle (Dodge Neon)?

http://www.ebay.com/itm/91-99-JEEP-G...item27c7e46838
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Unread 12-24-2013, 08:43 AM   #401
Kman1983
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I'm still running the stock 4.0 header on my CJ5. Welded the crack up years ago and it has been fine.
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Unread 12-24-2013, 03:37 PM   #402
captkhaos
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Yeah, the stock manifold is not what I'm after. I'm thinking Borla or Doug Thorley. For some reason there is a difference between the '91 YJ header and the '93. I'm wondering about clearance for the clutch linkage etc.
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Unread 12-25-2013, 08:17 AM   #403
billybooster2
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Quote:
Originally Posted by captkhaos View Post
Yeah, the stock manifold is not what I'm after. I'm thinking Borla or Doug Thorley. For some reason there is a difference between the '91 YJ header and the '93. I'm wondering about clearance for the clutch linkage etc.
The 91 you are looking at MIGHT be for an early 4.o renix? ARe you keeping stock CJ bellcrank clutch or converting to hydraulic?
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Unread 12-25-2013, 08:29 AM   #404
captkhaos
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I've already got the hydraulic clutch installed; been there for years. The heat from the existing header already kills the seals every so often. I made a surrounding heat shield out of exhaust pipe which helps. If possible I'd like ceramic coating on the new header to really keep the heat down.
Merry Christmas!!!
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Unread 12-25-2013, 06:18 PM   #405
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I ran a stock 4.0 exhaust manifold in my CJ7 w/ a 4.0, NV3500, D300. It has the "spring" section in it which prevented stress on the header from movement in the exhaust system.
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