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Re: knocking sound from my 4.7 jeep gc
Glad to hear it got more quiet, the Seafoam product has a very good reputation. Under most circumstances a little lifter noise is something that comes with age and is not necessarily something that needs to be fixed right away unless the noise gets loud enough or is affecting performance. What is the year of your GC and how many miles does it have? Make sure you get oil changes at the recommended intervals and check your oil level often to avoid a harsher knock. I would recommend having an oil flush done with the next oil change, you may want to move to a higher grade of oil or a synthetic to help avoid further noise. As far as you question of price to fix, for now, stick to treating the problem with the above recommendations because there may not actually be damage yet, alot of engine noise is just its way of telling you it needs some TLC (oil changes and such)
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You need to get some kind of scan tool that can read the data ouput of the efi system while driving on the hills that give you problems.The efi system probably has a spark knock sensor.Reading the data off of the sensor while driving will tell if the sensor is telling the engine ecm to adjust itself for low quality fuel.The engine ecm is programmed to dial back power if it detects spark knock.Running poor quality fuel will cost you many dollars more in the long run.A lean running condition (low fuel pressure,partialy plugged injectors,plugged fuel filter) will cause spark knock under load.Carbon deposits on the pistons(internal engine problems) will cause spark knock.The knock is caused by fuel igniting before the spark plug ignites it-The piston is trying to go back wards.Sometimes there will be a factory reflash for the ecm if many of the engines had the same problem.Try reading on some Jeep forums online.This is a problem for a good auto tech-not your average flat rate parts swaper.If the jeep has had many miles since some maintenance(filters & spark plugs) you might start there before laying out $ for diag.
depends on how much you love your jeep. honestly. not trying to sound mean. i know some jeep crazies that will spend any amount to keep their baby running. if the jeep isnt that much to you probably best to sell it. Blue book value is about 3500 in fair shape
Sounds like the fluid coupler inside the transfer case failed. In my opinion using those is a great idea on paper but they just do not last as well as the older direct engagement units used in Cherokees and wranglers. I own many Jeeps and will not have a GC for that one reason. The transfer case needs to be removed and rebuilt. There is no external repair or temporary fix.
You probably messed up a rod or caused piston damage your going to need more than a head gasket usauly when you over heat a car you causing the pistonts to expand more then they need to causing scouring and exsisive piston ware by the sound of it and the year your better off replacing the whole motor or completely rebuilding the old one wich will cost more then a use motor! good luck!
If the diff is really low it may be overheating and binding but it would have to be really low or have a mechanical problem to begin with. Tires can cause binding because different manufacturers tires with the same #s have a different diameter (I know they should all be the same but they are not). This should cause problems if you have all wheel drive or are using 4 wheel drive (both ends of vehicle will be trying to go different speeds...Same holds true for different ratio diffs)If you have little experience with this stuff have someone go over it for you, It will cost less than blowing up the transfer case or something!!!
Try taking it to a body shop and see if they can give you a free estimate on the cost of repair, then its up to you. A 93 Jeep GC is not going to be worth a whole lot to a buyer, but if you plan on keeping the Jeep it may be worth the cost. That is a personal decision that you will have to make, based on finances, income, and when you plan on getting a newer vehicle. Just get the estimate first, see if they can repair it to the point that it works, but not necessarily looking like new. Best of luck!