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Over heating. Help!!

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Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Over heating. Help!!

Post by Xtultegra » July 28th, 2020, 7:55 pm

Fresh 4.6 build. Will run all day in stop and go traffic or idling up some knarly trail in 110 degree weather and never go over 195. Pull a hill on the highway or travel down the highway at 3000 rpm and it will over heat in about 5 minutes. Temp comes down if I slow down.

What I have done: new flow cooler water pump, high flow 194 thermostat, new double row aluminum radiator, new CPS, flushed the holy hell out of the system with Red Devil Flush (3 times), added wetting agent, running 60/40 water to coolant ratio.

Engine sounds great. Pulls like a beast. No stutters, backfires or misses. However, it idles past 12 degrees advanced, more like 20 degrees.

KarmaKannon1
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 46
Joined: May 21st, 2020, 10:13 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Utah

Re: Over heating. Help!!

Post by KarmaKannon1 » July 29th, 2020, 7:52 am

Have you tried backing the timing down(not even sure it's possible without a crank sensor mod)? I've never had the issue, but I've heard friends have to back their timing down because at speed they would run hot. I don't actually know the base timing for a 4.0 is. I'm guessing it can't be more than 15* btdc.

Clogged exhaust, transmission issues, and coolant cavitation would be some other things I'd be looking at.

RubiMikeTX
Posts: 5
Joined: September 27th, 2012, 12:29 pm
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: TJ

Re: Over heating. Help!!

Post by RubiMikeTX » July 31st, 2020, 7:53 pm

Are you still running the stock, original mechanical fan-clutch? If so, replace it.

Russ Pottenger
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Posts: 811
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Over heating. Help!!

Post by Russ Pottenger » August 29th, 2020, 12:37 pm

Any updates?

dwg86
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Stroker Displacement: 4.6
Vehicle Year: 2003
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Vehicle Model: Wrangler
Location: Atlanta, Ga

Re: Over heating. Help!!

Post by dwg86 » September 3rd, 2020, 8:50 am

Possibly running lean? what size fuel injectors are you running?

Bertismyname
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: May 12th, 2020, 8:01 pm
Vehicle Year: 1999
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Over heating. Help!!

Post by Bertismyname » September 20th, 2020, 11:58 am

More than once I have seen the wrong water pump installed. Be sure that it is the correct rotation for your engine. The wrong rotation will cool a little bit. But, at higher loads and engine speeds it quickly over heats.

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SkylinesSuck
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Joined: February 14th, 2009, 11:11 pm
Stroker Displacement: 4.6L
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Vehicle Model: Wrangler
Location: Northern VA

Re: Over heating. Help!!

Post by SkylinesSuck » September 22nd, 2020, 7:16 am

KarmaKannon1 wrote:
July 29th, 2020, 7:52 am
Have you tried backing the timing down(not even sure it's possible without a crank sensor mod)? I've never had the issue, but I've heard friends have to back their timing down because at speed they would run hot. I don't actually know the base timing for a 4.0 is. I'm guessing it can't be more than 15* btdc.
It is not possible, at least how you are thinking. And retarding timing increases temps, not decrease.

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 18th, 2020, 8:28 pm

KarmaKannon1 wrote:
July 29th, 2020, 7:52 am
Have you tried backing the timing down(not even sure it's possible without a crank sensor mod)? I've never had the issue, but I've heard friends have to back their timing down because at speed they would run hot. I don't actually know the base timing for a 4.0 is. I'm guessing it can't be more than 15* btdc.

Clogged exhaust, transmission issues, and coolant cavitation would be some other things I'd be looking at.
New header, exhaust, cat, straight flow muffler.

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 18th, 2020, 8:30 pm

RubiMikeTX wrote:
July 31st, 2020, 7:53 pm
Are you still running the stock, original mechanical fan-clutch? If so, replace it.
Tried stock fan and two electric fans with shroud. Electric fans worked better, but still can't go freeway speeds without overheating.

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 18th, 2020, 8:41 pm

dwg86 wrote:
September 3rd, 2020, 8:50 am
Possibly running lean? what size fuel injectors are you running?
Bosch flow rates @ 43.5 psi / 3 bar24.7 lb

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 18th, 2020, 8:42 pm

Bertismyname wrote:
September 20th, 2020, 11:58 am
More than once I have seen the wrong water pump installed. Be sure that it is the correct rotation for your engine. The wrong rotation will cool a little bit. But, at higher loads and engine speeds it quickly over heats.
Used stock pump, then tried high flow. No difference. :(

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 18th, 2020, 8:45 pm

Russ Pottenger wrote:
August 29th, 2020, 12:37 pm
Any updates?
Barely stays at 220 going 3000 rpm down freeway in 60 degree weather. Have been thinking about trying an oil cooler or maybe one big electric fan instead of the two smaller. Fan doesn't seem likely problem as I'm doing 65 down the freeway. Tried removing lights and winch but didn't help. Maybe my ecu is bad. Everything works great. Just over heat at high rpm. Jeep is nearly unusable on freeway during summer. :(

bnelson
Posts: 8
Joined: September 9th, 2020, 12:46 pm
Vehicle Year: 2002
Vehicle Make: Jeep
Vehicle Model: TJ

Re: Over heating. Help!!

Post by bnelson » November 19th, 2020, 2:25 pm

Sounds silly but have you replaced your radiator hoses? I have seen the inside of a hose tear loose and with normal flow/low RPM they seem to cool fine but with higher RPM and faster water flow the inner lining balloons up and blocks the flow of coolant. Also how old is the radiator? Water scale buildup possibly?

Xtultegra
Where's the "any" key?
Where's the "any" key?
Posts: 26
Joined: February 19th, 2019, 12:44 am
Stroker Displacement: 4.6
Vehicle Year: 1991
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: Over heating. Help!!

Post by Xtultegra » November 20th, 2020, 7:33 pm

bnelson wrote:
November 19th, 2020, 2:25 pm
Sounds silly but have you replaced your radiator hoses? I have seen the inside of a hose tear loose and with normal flow/low RPM they seem to cool fine but with higher RPM and faster water flow the inner lining balloons up and blocks the flow of coolant. Also how old is the radiator? Water scale buildup possibly?
Yeah, started with spendy silicone hoses, but switched to oem hoses just to see if that would work.

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