CJ with 350 TBI running hot HW speeds uphill - Page 6 - JeepForum.com
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post #76 of 82 Old 03-04-2016, 09:33 AM Thread Starter
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1986 CJ7 
Join Date: Feb 2016
Location: San Diego
Posts: 13
gmakra did bring up some valid questions. So here are the answers.

1. As mentioned previously the plugs look normal.
2. No idea what the grade is. It varies. 4000' over 34 miles. Last 10 miles or so is where it really starts to run hot. Could be a steeper grade or just cumulative effects.
3. Not pulling anything.
4. Outside temps have been 70-88*. I've had this problem for awhile and this stretch of road is between me and a favorite offroad spot so I've traveled it at least a half dozen times.
5. No earthly idea what the humidity was but it is socal so it is usually pretty low.
6. No engine codes thrown
7. Scooby asked about timing. Initial timing is 0* TDC.
8. Someone mentioned O2 sensors. I replaced about a year ago.

Last edited by cowboyx; 03-04-2016 at 10:16 AM.
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post #77 of 82 Old 03-04-2016, 10:37 AM
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1980 CJ5 
Join Date: Jul 2006
Posts: 8,771
I'd be looking to make sure the transmission is working correctly. Get the linkage fixed!

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #78 of 82 Old 03-04-2016, 10:45 AM Thread Starter
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1986 CJ7 
Join Date: Feb 2016
Location: San Diego
Posts: 13
Originally Posted by lucdog View Post
I'd be looking to make sure the transmission is working correctly. Get the linkage fixed!
Hoping to get it done this weekend!
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post #79 of 82 Old 03-04-2016, 03:45 PM
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1986 CJ7 
Join Date: Feb 2011
Location: Muskegon
Posts: 2,047
One other thing. I had a couple of water pumps that performed without issue at low rpm. Idle, off road, etc., but when driving on road and above 40 mph, started to overheat. With the pump being new I moved on to radiator, fans, etc. In the end I went back to square one. My new pump was replaced a third time. This time, all was as it should be. I tore apart the previous pump and found that the impeller was just staked onto the shaft. This held until there was too much resistance, then it slipped, causing overheating.

Just an experience of my own...
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post #80 of 82 Old 03-04-2016, 05:58 PM
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1980 CJ7 
Join Date: Apr 2010
Location: Texas
Posts: 1,472
Once you get the transmission to down shift, I think your problems will be solved. The turbo 400 has a final output of 1:1, second gear is 1.48:1 so your RPMs will kick up almost 50% and you'll get the coolant flow you need. As it is now you are more than likely lugging the engine, and the engine is creating the power it needs to push you up the hill and I'll bet its running on the rich side doing it, lots of heat to remove but not the RPMs to generate the required coolant flow.
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post #81 of 82 Old 03-05-2016, 06:30 PM
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1985 CJ7 
Join Date: Sep 2011
Location: Reno
Posts: 2,712
Any chance you have exhaust restriction?

1985 CJ7 with 1994 4.6, Dana 44 4.10 TrueTracs
2001 TJ 4.0 Dana 44 4.10 TrueTracs
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post #82 of 82 Old 03-30-2016, 01:40 PM
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1982 CJ8 
Join Date: Mar 2010
Location: Harrison
Posts: 32
hey guys...I hope you keep posting on this because I have a similar issue. 82 jeep scramble with a stock carbureted 355. only heats up at highway speeds over 50. does great around town and on the trail. I have to admit that I don't know the actual temp yet because I am using the factory gauge. it was blowing a little fluid out when I stopped after extended hwy speed but I replaced the rad cap and stopped that. I just know I have a 160 thermostat and it generally runs in a certain location on the gauge. I drive for a while at speeds above 50mph and the gauge will climb although very slow it will continue to rise until I slow down. it tachs 3000rpm at 60mph. I have a 3 row aluminum rad with mechanical fan and no shroud. my grill is restricted by the winch quit a bit. I will try to post a picture of he grill.
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