Question about 1999 Jeep Grand Cherokee

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While driving there is a knocking noise from under the car. It's not rhythmic but random. Almost sounds like something revolving inside the oil pan or transmission pan.

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Check you drive shafts or bad u jiont

Posted on Sep 10, 2010

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Might be a loose muffler.

Posted on Sep 10, 2010

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Can you fix a piston rod knocking without pulling motor,by dropping oil pan?


Depends on the car, Some you can some you cant. Generally speaking if the car has rear wheel drive and conventional gearbox you got a chance. Only way to tell is to look under the car and see how accessible the sump pan is

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My van is making noise like knocking inside the engine & it's getting louder when i'm driving.


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My car is a 2006 Suzuki forenza manual with 67k miles on it. It just had an oil change a few months ago with a new filter as well. I didn't drive the car for a few days while the temperature was...


Suzuki should have stayed with just motorcycles. Anyway, You just had the oil changed. Check and see if they changed the filter also. They may have forgot or were just to lazy. Just a chance the oil filter is bad, I would replace it again(is the oil clean on the dipstick?). Add a higher viscosity oil. At 67,000 miles, you would have to drive dirt roads all the time, with no air filter to get sludge to clog the head ports. Which is slow drain of oil to the pan. The oil pump? well it could be, most likely not. I would say the oil sending unit is bad, but the knocking noise kind of throws that off. Knocking is bad, if it happens again, pull off and shut the engine down. One other thing to watch is the temperature gauge. getting really hot will cause knocking. Check coolant level and the thermostat.

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sounds like lower engine damage, could be a bearing or low oil pressure but if knocking the damage is done. i would have a tech just double check it to make sure, i have seen flywheels make noise and pulleys and a/c compressors, so just make sure it is in the oil pan if so then engine will need repair.

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I took the car for repair and they fixed my oil pan valve cover gasket and the oil pan gasket. they put the knock sensor wire direct to the knock sensor since they didnt have a connector. i drove off and...


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It's a common problem with these cars i am actually fixing mine as of now. That car is all about oil pressure and when it is low you'll start to get a tap and or what sounds like a knock due to the lifters not having enough pressure. Try taking your oil pan off and check your oil pick up line going from the oil pan to the turbo. A lot of times it gets a lot of sludge build up and makes the pressure little to none. If that looks clear check the slump inside the oil pan and see if that has sludge build up. Well hope this helped

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Knocking sound coming from around the oil pan.


This is a big sign that you might have a spun rod bearing if it's coming form your oil pan. Use a screwdriver and put the flat tip end on the oil pan and the plastic end near your ear like a stethascope and if you hear a knocking it's probaly a spun rod bearing or a bent or warped wrist pin on the bottom of your piston. So some good advice is to not run it anymore until you get it a mechanic to fix it. If you want to do it yourself you have a job ahead of you but refer to an Haynes Auto Repair Manual and you will have fun doing a job by yourself. I hoped this help!

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I'd consider some fresh, clean oil & filter change first of all, if it hasn't been done . drive it for a while providing it isn't too bad, & see if it goes away, if not get back to us.

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If you heard a loud knocking.....I'm sorry to say, I'd hope for the worst. It doesn't sound good that you lost that much oil.

But try to clean it with a steamer or with some brake clean. Put a little oil back in and see where it is coming from. If it runs out without starting the car.....then you have definitely cracked the block, or the oil pan.

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