I have a 2013 Jeep Wrangler Sahara Unlimited, 3.6L with about 160,000 miles. I got a check engine light , P128, which either points to the thermostat or the temp sensor in the block. I changed out the sensor first, and when doing so the coolant system was sealed other than the sensor coming out of the block. Little to no anti freeze came out when I swapped from old to new sensor and thought it was strange. Pulled the battery terminals off to clean them and left them off for well over 30 minutes. Reinstalled terminals and went for a start. Temperature gauge in the Jeep was reading normal after running the Jeep to operating temperature, as it was exhibiting with the old sensor. A day or two later P128 came back. Tried to clear the code but it was a hard code and would not clear, but the check engine light went out.
At the same time I changed the oil, and after starting the vehicle to get new oil circulating I got an oil pressure code that is a hard code as well and will not clear. I would assess that the ECM hard codes these issues until a series of driving the vehicle to ensure the problem is remedied??? In any event in the middle of this the P128 code/check engine light came back. I have replaced a radiator in this vehicle as well as a thermostat a couple of years ago prior to the thermostat I just installed and never had an air pocket or issue burping this cooling system. There is currently no oil in the antifreeze, not sign of anti freeze in the oil, no white cloud coming out of the exhaust with the exception of condensation from sitting for the past week.
I have a cooling system that is misbehaving and I cannot burp it. Tried everything but putting the damn thing on a chain hoist and pointing the nose of the Jeep vertical in the air. I have tried burping this thing three times, spent over 100.00 in 50/50 Chrysler mix, get the majority of the air out, put the cap on and the overflow jug starts to dance or of you leave the cap off to continue to fill the system the radiator at some point after the thermostat opens starts to act like the coolant is boiling and starts blowing out of the radiator fill, and all the while the temperature gauge is reading normal in the Jeep.
I performed a compression test yesterday and all cylinders were showing 150psi on the gauge with the exception of the no. 1 cylinder, which came in around 110 at first, then worked its way up to 150 after three or four repeats of the test. I did not shut the fuel injector system down (not sure if I just pull the fuel pump fuse or any other way) so my assessment was that the cylinder took on fuel and the compression improved because of the gas in the cylinder. Will duplicate the test today. Prior to pulling the engine apart to get to the spark plugs the engine ran great with no noises or skips/stumbling. The limits for the compression test that I found on line were 100 PSI with a 25% differential from all other cylinders and could not be under 100 psi. If the #1 cylinder tests good this morning what can I do to burp this thing? Anyone else experience this?
At the same time I changed the oil, and after starting the vehicle to get new oil circulating I got an oil pressure code that is a hard code as well and will not clear. I would assess that the ECM hard codes these issues until a series of driving the vehicle to ensure the problem is remedied??? In any event in the middle of this the P128 code/check engine light came back. I have replaced a radiator in this vehicle as well as a thermostat a couple of years ago prior to the thermostat I just installed and never had an air pocket or issue burping this cooling system. There is currently no oil in the antifreeze, not sign of anti freeze in the oil, no white cloud coming out of the exhaust with the exception of condensation from sitting for the past week.
I have a cooling system that is misbehaving and I cannot burp it. Tried everything but putting the damn thing on a chain hoist and pointing the nose of the Jeep vertical in the air. I have tried burping this thing three times, spent over 100.00 in 50/50 Chrysler mix, get the majority of the air out, put the cap on and the overflow jug starts to dance or of you leave the cap off to continue to fill the system the radiator at some point after the thermostat opens starts to act like the coolant is boiling and starts blowing out of the radiator fill, and all the while the temperature gauge is reading normal in the Jeep.
I performed a compression test yesterday and all cylinders were showing 150psi on the gauge with the exception of the no. 1 cylinder, which came in around 110 at first, then worked its way up to 150 after three or four repeats of the test. I did not shut the fuel injector system down (not sure if I just pull the fuel pump fuse or any other way) so my assessment was that the cylinder took on fuel and the compression improved because of the gas in the cylinder. Will duplicate the test today. Prior to pulling the engine apart to get to the spark plugs the engine ran great with no noises or skips/stumbling. The limits for the compression test that I found on line were 100 PSI with a 25% differential from all other cylinders and could not be under 100 psi. If the #1 cylinder tests good this morning what can I do to burp this thing? Anyone else experience this?