Out of patience...Need help with overheating problem
08-21-2013, 11:43 PM
#16
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Temps OK? If so, drive it under a condition to make it hot and have a passenger on board to watch the timing to see if goes haywire beforehand. I am guessing the only thing that has not been replaced is the PCM, correct? You can borrow a cooling system pressure test kit from Vatozone, pump up the system and see if it holds 16 lbs. If not there is a leak, do you notice a loss of coolant?
08-21-2013, 11:43 PM
#17
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Pull the 0331 head and use it for a door stop. Get an aftermarket head and Felpro gasket kit.
Install and enjoy.
08-21-2013, 11:47 PM
#18
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I feel like doing that just so I can say it's been done, even if it doesn't help. Might as well try one more thing... Haha
08-21-2013, 11:57 PM
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Year: My Jeep is a GMC
I HAVE THE EXSACT PROBLEM!!!!!
It's been 2 years now and replaced all hoses, 3 core aluminum champion radiator, water pump( counterclockwise wise) 160 thermostat, cooling system flush, external tranny cooler, and the 3 ten inch electric fan conversion. The only two more things I can think of is engine bypass cooling flush, and switching the stock water divergent thing on the heater hoses. If that don't work I WILL throw it off a cliff!!!
It's been 2 years now and replaced all hoses, 3 core aluminum champion radiator, water pump( counterclockwise wise) 160 thermostat, cooling system flush, external tranny cooler, and the 3 ten inch electric fan conversion. The only two more things I can think of is engine bypass cooling flush, and switching the stock water divergent thing on the heater hoses. If that don't work I WILL throw it off a cliff!!!
I'm in for $20.
08-22-2013, 12:45 AM
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Is it possible for the 0331 head to be bad enough to cause overheating with no coolant apparent in the oil and no oil in coolant?
08-22-2013, 12:53 AM
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http://www.blackstone-labs.com/
08-22-2013, 06:55 AM
#24
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They replaced the head with another under warranty. Overheating problem solved.
This was on a '92 HO. Not even an 0331 head!
08-22-2013, 04:07 PM
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I saw you posted that the carbon monoxide test changed the color from blue to a blueish green. From experience I can tell you that is on its way to yellow and if there is no combustion gas present it will not change at all.
I saw some one post on here that the pcm could be the issue is that true? Has anyone ever heard of the pcm over advancing the timing? and it registering on a scan tool?
I saw some one post on here that the pcm could be the issue is that true? Has anyone ever heard of the pcm over advancing the timing? and it registering on a scan tool?
08-22-2013, 04:19 PM
#26
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I saw you posted that the carbon monoxide test changed the color from blue to a blueish green. From experience I can tell you that is on its way to yellow and if there is no combustion gas present it will not change at all.
I saw some one post on here that the pcm could be the issue is that true? Has anyone ever heard of the pcm over advancing the timing? and it registering on a scan tool?
I saw some one post on here that the pcm could be the issue is that true? Has anyone ever heard of the pcm over advancing the timing? and it registering on a scan tool?
The fact is, you have an 0331 head. Get rid of it. It's the next logical step.
08-22-2013, 05:19 PM
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"The fact is, you have an 0331 head. Get rid of it. It's the next logical step."
It should be the FIRST logical step on a Jeep that has one of those.
It should be the FIRST logical step on a Jeep that has one of those.
08-22-2013, 05:23 PM
#28
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I think that might only apply to 2000-2001 models also, that have the computer controlled iginition timing. Anything older is all mechanical. I can't see that causing an overheating condition, however. You'd be running rough, possibly.
The fact is, you have an 0331 head. Get rid of it. It's the next logical step.
08-22-2013, 08:00 PM
#29
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Put in a 1 row 1.5" core oem style radiator today. Still a little air in the system, but seems to be running hotter than before.
Last edited by bigbearxj; 08-22-2013 at 08:22 PM.
08-22-2013, 09:15 PM
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Timing could be controlled by the PCM at least to a certain extent way back to the Renix models, and the Duraspark models before that.
FWIW- Mine ('96) runs 13-14 degrees advance at hot idle, your numbers are right in the ballpark.
Last edited by Radi; 08-22-2013 at 09:18 PM.