Car was running great after changing water pump but i opened bleeder valve at the upper radiator hose and car started knocking really loud and gave a cylinder 2 misfire code
Okay, it may be due to overheating, that may be the noise you heard, lets hope. first allow engine to cool, open radiator cap or the resivoir cap, which ever is the fill, remove the bleeder at top hose and fill radiator slowly until coolant comes out bleeder.
note if water pump was replaced due to leaking and engine was overheated at that time then it may be a good idea to replace the thermostat .
after filling is done start engine and allow it to run. watch temperature if temp start to climb past half way shut engine down and let sit for 5min. then restart and check level, in res do not open cap . feel air from fan and see if it is getting hot, this may take up to a half hour but do not drive,
A few questions, does this jeep have an electric fan?
when you heard the knocking was engine temp hot?
If you start jeep cold does engine knock?
Did this jeep get a new thermostat with waterpump job?
did it overheat when pump went bad and why did water pump get replaced?
sorry for all the questions ,just trying to get all the info to help you .
SOURCE: Jeep GCL Backfires Stalls
Aaron, I had the same problem. It is the most expensive part of course the computer. I replaced everything as well till I replaced it. They are remanufactured and have had problems with them as well. I am on my third one now at 200k miles. Oh and by the way it does not show up on the diagnostic check. Good luck
Frank
SOURCE: 1996 Jeep cherokee, leaking coolant when cold/ hot ok.
waterpump houseing/shaft seal is on the way out hence the water/coolant, running along the block. when hot the seal does so, when cold and depressurising seal doesnt.
SOURCE: Jeep Wrangler leaking coolant
IT IS THE WATER-PUMP. PLEASE DON'T WAIT FOR IT TO OVER-HEAT BECAUSE THEN IT WILL BE TOO LATE, AND VERY COSTLY. PRICE A HEAD-GASKET JOB AND COMPARE IT TO THE COST OF A WATER PUMP. HOPE THIS HELPS YOU MAKE THE RIGHT CHOICE. BEST OF LUCK.
SOURCE: heating problem
If you changed the thermostat yourself and have noted that the lower radiator hose is cooler than the upper radiator hose, you may have installed the thermostat incorrectly or have purchased a faulty thermostat. A lower radiator hose that does not get hot (or as hot as the upper radiator hose) is a direct indication of a faulty thermostat. Please vote for this solution if you found this to be helpful. Thanks,
SOURCE: I am trying to troubleshoot my wife's 2006 Jeep
i would say change the thermostat its a possibilty it's sticking and not opening when it should be i would change it and see what happens from there
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