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Unread 08-23-2011, 10:41 AM   #1
TxJeeper20
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overheating ?

I have a 258 anda t176 under my 5 and if i go 55+ for about 20 miles it starts running weird for few minutes when i slow it down and stop after it idles for few mins it returns to normal running what could cause it?

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Unread 08-23-2011, 11:55 AM   #2
ericksin
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I'm having same problem with mine, I have a 360 with TBI a 999 trans. i have installed a 3 core radiator, 95%water in my radiator and used red line additive (it says it drops temp 10 to 20 deg.) elect. fan with my stock fan, trans cooler, fuel cooler, wrap the headers, 185 thermostat, installed vents on my hood, check the timing its good, not running lean or rich.

My jeep will over heat at higher speed as well, if i pull over and let it idle it wont cool down, but by that time it will vapor lock, i am reading the thread vapor lock/vacuum problem AMC360!! on the forum there are a few things im going to try, but i will still have a motor that runs hot around 215 to220, maybe there is something wrong with the motor
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Unread 08-23-2011, 11:58 AM   #3
Jon In Tucson
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Quote:
Originally Posted by Timekeeper View Post
I have a 258 anda t176 under my 5 and if i go 55+ for about 20 miles it starts running weird for few minutes when i slow it down and stop after it idles for few mins it returns to normal running what could cause it?
What do you call "weird running" in a CJ?... Loss of power, miss, surge, shake, shimmy? Inquiring minds want to know. God bless.
Jon In Tucson
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Unread 08-23-2011, 12:01 PM   #4
foggybottombob
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Try running medium octane gas for a tank and see if that changes your issue. It is not unusual for a 258 to have detonation with lowest octane gas. Detonation will make your engine temps go up very quickly.
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Unread 08-23-2011, 01:36 PM   #5
CoryA
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Quote:
Originally Posted by foggybottombob
Try running medium octane gas for a tank and see if that changes your issue. It is not unusual for a 258 to have detonation with lowest octane gas. Detonation will make your engine temps go up very quickly.
It's a 383 runnin premium already

Oops just realized that one wasn't directed toward me. just realized this wasn't my thread. Our thread names are. Bit too close "Overheating?" and "overheating!"
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Unread 08-23-2011, 09:30 PM   #6
TxJeeper20
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welll it misses at idle when under load runs normal but when its just short trips around town runs idles fine but when i leave city limits it goes and over heats a bit when i reach my destination,

could the radiator having a small leak at the cap keep it from pressurizingand cooling proprley?
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Unread 08-25-2011, 03:46 PM   #7
mcmud
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Quote:
Originally Posted by TxJeeper16 View Post
welll it misses at idle when under load runs normal but when its just short trips around town runs idles fine but when i leave city limits it goes and over heats a bit when i reach my destination,

could the radiator having a small leak at the cap keep it from pressurizingand cooling proprley?
I think so.
If it is the cap leaking install a new 16psi cap and let us know.
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Unread 08-26-2011, 01:30 AM   #8
TxJeeper20
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already have new cap on it lol less than 5 months old
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Unread 08-26-2011, 06:28 AM   #9
foggybottombob
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It's either something restricting your coolant flow or it's your gas.
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Unread 08-26-2011, 08:11 AM   #10
TxJeeper20
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well I use the cheap stuff lol I am not gunna put any money into fixing it ,ill be home for 15 days then when my leave is over its gunna be torn down and when i get back next year it will be new with 350 tbi and goodies lol

could it be my carbs running bit lean combined with 55+ mph spped for 20 or so miles on highway
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Unread 08-26-2011, 08:41 AM   #11
foggybottombob
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A lean mixture will run hot.
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Unread 08-26-2011, 09:07 AM   #12
Menako
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Water pump helped mine. 304, 195 degree therm. Put in high flow water pump, works great. See a lot of post for heating problems! Good luck.
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Unread 08-26-2011, 04:36 PM   #13
ericksin
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Hey Menako
What heat problems where you experiencing before you put that pump on?

Wouldn't the thermostat restrict your flow if you where to put a high flow water pump? or am i not thinking outside the box
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Unread 08-26-2011, 05:18 PM   #14
Menako
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The way they are designed is for high flow at low speeds, have spring set up on blades that retract at normal speeds. The jeep I have, had no thermostat when I got it. My heating problems showed up when I installed the 195 degree thermostat. Was my Dad's Jeep, old school thinking I guess, if it gets hot, throw the thermostat away! My point was, water pump was my problem. You listed all the things you had for cooling, plus 3 core raditor. But if water not curulating properly you will over heat. Just a thought. Adding cores would have been my first thought, but 3 core is nice! Good luck
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Unread 08-26-2011, 06:38 PM   #15
titomars
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i had the same problem when i got my 81 CJ7 with a 258. after doing a bit of trouble shooting i came to the conclusion that my water pump was at fault. it was new when i got the jeep. pulled it off and found the PO had installed a reverse rotation pump. i have V-belts the pump was for serpentine belt system.
i replaced the pump with the correct one and never had a cooling issue since even in 110 deg days in stop and go traffic, or doing 70+ mph for 2 hours. you might want to check your pump.
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