Dead 5.7 Hemi? Compression help needed.
05-16-2022, 06:56 AM
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Dead 5.7 Hemi? Compression help needed.
Hello all I'm posting here because the wife's 2006 5.7 Jeep Commander Hemi is dead....If there is a more suited forum for 3rd Gen Hemi discussion, please guide me that way...
Engine blew a heater hose and my wife kept driving till it shut down from overheating. I get it towed home and have the following codes:
Cylinder 8 Misfire Detected (may have been preexisting)
Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
HO2s Heater Control High Bank 2 Sensor 2 (may have been pre existing)
Engine Oil Temp Sensor A Circuit Low
Engine Coolant Temp Sensor 1 Circuit Low
Jeep won't start and has issues cracking over. I found no water in the oil and oil level was fine. Before, I start ordering sensors and o2 sensors, I did a compression check w/ the starter only. Cracking the engine over was very weak and slightly erratic. I only found about 40-90 PSI on 5 cylinders and 0 PSI on #1, 2 & 7. Tell me if I did the compression test correctly. I only pulled one plug (of the two) at a time, cranked w/ the starter and read the gauge, reinstalled the plug loosely and moved on to the next cyclinder. I didn't pull a single plug on all cylinders prior to taking individual readings. Maybe I should have?
I could smell and see fuel on each plug I pulled. No water was observed in any cylinders and #8's plug was fouled w/ oil which I think was a preexisting issue (valve seal?). At this time, I'm anticipating blown head gaskets or worse....
Also, I know this engine has some way of running on fewer cyclinder at cruise for fuel economy. Is there anything special I need to do to compression check this engine.
Thank you in advance.
Engine blew a heater hose and my wife kept driving till it shut down from overheating. I get it towed home and have the following codes:
Cylinder 8 Misfire Detected (may have been preexisting)
Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
HO2s Heater Control High Bank 2 Sensor 2 (may have been pre existing)
Engine Oil Temp Sensor A Circuit Low
Engine Coolant Temp Sensor 1 Circuit Low
Jeep won't start and has issues cracking over. I found no water in the oil and oil level was fine. Before, I start ordering sensors and o2 sensors, I did a compression check w/ the starter only. Cracking the engine over was very weak and slightly erratic. I only found about 40-90 PSI on 5 cylinders and 0 PSI on #1, 2 & 7. Tell me if I did the compression test correctly. I only pulled one plug (of the two) at a time, cranked w/ the starter and read the gauge, reinstalled the plug loosely and moved on to the next cyclinder. I didn't pull a single plug on all cylinders prior to taking individual readings. Maybe I should have?
I could smell and see fuel on each plug I pulled. No water was observed in any cylinders and #8's plug was fouled w/ oil which I think was a preexisting issue (valve seal?). At this time, I'm anticipating blown head gaskets or worse....
Also, I know this engine has some way of running on fewer cyclinder at cruise for fuel economy. Is there anything special I need to do to compression check this engine.
Thank you in advance.
05-16-2022, 10:42 AM
#2
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There are many common failures on modern engines that overheat. Head gasket, valve seats, dropped valve’s, burned rings, etc.. so with no compression in a few holes your motor is probably toast and you should probably look for a replacement.
good luck with your search
good luck with your search
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