Over heating. Help!!
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Over heating. Help!!
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.
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.
-
- Making Progress
- Posts: 63
- 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!!
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.
Clogged exhaust, transmission issues, and coolant cavitation would be some other things I'd be looking at.
-
- Posts: 5
- Joined: September 27th, 2012, 12:29 pm
- Vehicle Year: 2004
- Vehicle Make: Jeep
- Vehicle Model: TJ
Re: Over heating. Help!!
Are you still running the stock, original mechanical fan-clutch? If so, replace it.
-
- Strong Poster
- Posts: 901
- Joined: August 15th, 2009, 1:27 am
- Stroker Displacement: 4.7
- Vehicle Year: 2000
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Re: Over heating. Help!!
Any updates?
-
- Donator
- Posts: 1210
- Joined: February 13th, 2008, 6:20 pm
- Stroker Displacement: 4.6
- Vehicle Year: 2003
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
Possibly running lean? what size fuel injectors are you running?
-
- I think I'll order a "tab"
- Posts: 41
- Joined: May 12th, 2020, 8:01 pm
- Vehicle Year: 1999
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Re: Over heating. Help!!
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.
- SkylinesSuck
- Donator
- Posts: 545
- Joined: February 14th, 2009, 11:11 pm
- Stroker Displacement: 4.6L
- Vehicle Year: 1998
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
- Location: Northern VA
Re: Over heating. Help!!
It is not possible, at least how you are thinking. And retarding timing increases temps, not decrease.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.
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
New header, exhaust, cat, straight flow muffler.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.
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
Tried stock fan and two electric fans with shroud. Electric fans worked better, but still can't go freeway speeds without overheating.RubiMikeTX wrote: ↑July 31st, 2020, 7:53 pm Are you still running the stock, original mechanical fan-clutch? If so, replace it.
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
Used stock pump, then tried high flow. No difference.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.
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
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.
-
- Noob
- Posts: 14
- Joined: September 9th, 2020, 12:46 pm
- Vehicle Year: 2002
- Vehicle Make: Jeep
- Vehicle Model: TJ
Re: Over heating. Help!!
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?
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
Yeah, started with spendy silicone hoses, but switched to oem hoses just to see if that would work.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?
-
- Learning to use the board
- Posts: 36
- Joined: February 19th, 2019, 12:44 am
- Stroker Displacement: 4.6
- Vehicle Year: 1991
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
Re: Over heating. Help!!
Radiator is brand new double core oversize
Who is online
Users browsing this forum: No registered users and 1 guest