My wife's 2000 jeep grand Cherokee has a bad knock in it, I put oil in it for it was low but Your Answer: Looking for a Used Cherokee in your area?CarGurus has 27,306 nationwide Cherokee listings starting at $5,495. Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies. Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01) 2000 Jeep Engine KnockSenior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0 I am a new Jeep owner , 2000 cherokee sport 4.0 with 141,000 miles. About a month ago the engine light comes on and it's a code for "misfire cylinder 3 ". I replace the plugs which were all very worn and do a reset. That worked for about two weeks and the engine light comes back on with the same code.A few days ago I hear this knocking noise and when I give it gas the noise gets louder. A mechanic told me it was rod knock as a result of a bad bearing and he could fix for $600. Another mechanic says don't fix it because it's putting a band-aid on the problem. His solution replace the engine and he could do that for $1000. Another mechanic said to first replace the ignition coil and an oil change because that could be the reason for knock. If that does not work than too only replace the lower mount of the engine and not the entire thing. I am so confused and just need to know the best way to handle this issue so that I can get back on the road. Thanks in advance. Newbie
Join Date: Feb 2012 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts Quote: Originally Posted by MASCOTT I am a new Jeep owner , 2000 cherokee sport 4.0 with 141,000 miles. About a month ago the engine light comes on and it's a code for "misfire cylinder 3 ". I replace the plugs which were all very worn and do a reset. That worked for about two weeks and the engine light comes back on with the same code.A few days ago I hear this knocking noise and when I give it gas the noise gets louder. A mechanic told me it was rod knock as a result of a bad bearing and he could fix for $600. Another mechanic says don't fix it because it's putting a band-aid on the problem. His solution replace the engine and he could do that for $1000. Another mechanic said to first replace the ignition coil and an oil change because that could be the reason for knock. If that does not work than too only replace the lower mount of the engine and not the entire thing. I am so confused and just need to know the best way to handle this issue so that I can get back on the road. Thanks in advance. My advice is to check your litters if you run your jeep with a messed up lifter it could bend the rod and mess the whole engine up.it is definitely not a cheap fix to fix a bent rod but litters can be a DIY job and costs ab. $100 Senior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0 None of the mechanics mentioned lifters, but I did see a youtube video that mentioned lifters. To my knowledge the rod is not damaged because the noise just started on Wednesday and I immediately parked the Jeep. I'm thinking maybe I should pay the $90 to PEP boys and find out exactly what I'm dealing with. I bought this because everyone said how reliable a Jeep can be and being disabled, going to see at least 4 doctors and test every week I need dependable. I'm still not sure what to do????? Do I replace the ignition coil ( I was told this would cause knock also)and have the lifters checked? I don't have a lot of money as I'm on a fixed income,but I have family that will help. I just don't want to be ripped off and taken advantage of. CF Veteran
Join Date: Nov 2010 Location: In the middle of Minnesota! Posts: 5,727 Year: 1999 Model: Cherokee Engine: 4.0 A 2000 doesn't have a separate ignition coil. It has a coil pack / coil rail ignition. That isn't going to give you a knock. So you should rule out the mechanic that pointed you in that direction as he obviously doesn't know his way around an XJ. What exactly is your oil pressure at idle with a hot engine? Are you ever having to add anti-freeze to your coolant reservoir? The reason I'm asking these questions is that some 00-01 engines can have the cylinder head crack between cylinders 3-4 because of a casting defect. That can result in low oil pressure, having to add coolant, and sometimes a knock in your engine. Not saying that is what is going on with your engine; just asking questions to try to help you isolate this a bit more.......
Last edited by tjwalker; 02-11-2012 at 12:00 PM. Newbie
Join Date: Feb 2012 Posts: 22 Likes: 0 Received 0 Likes on 0 Posts Quote: Originally Posted by MASCOTT None of the mechanics mentioned lifters, but I did see a youtube video that mentioned lifters. To my knowledge the rod is not damaged because the noise just started on Wednesday and I immediately parked the Jeep. I'm thinking maybe I should pay the $90 to PEP boys and find out exactly what I'm dealing with. I bought this because everyone said how reliable a Jeep can be and being disabled, going to see at least 4 doctors and test every week I need dependable. I'm still not sure what to do????? Do I replace the ignition coil ( I was told this would cause knock also)and have the lifters checked? I don't have a lot of money as I'm on a fixed income,but I have family that will help. I just don't want to be ripped off and taken advantage of. The best thing you could do is to get some healthy family members to help you replace the lifters. (first have it diagnosed) but if you do this at home and you know what you are doing you can get the job done. My brother used to have a Toyota Tacoma and I helped him work on it,it had a engine knock we fixed the lifters and the knock was gone and the car worked. Senior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0 The oil pressure is over 40 when hot and I did add some coolant a few weeks ago, but I've only had the jeep since November. I'm going to check the coolant shortly. I know about the coil pack and I've priced a new one. Will Lucas help so that I can at least get it to the pep boys or should I get a tow? Senior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0 It sure would be awesome to find a Jeep owner/repair person in my city and state. I sure could use the help. Member
Join Date: Jun 2011 Posts: 161 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee
My jeep had a knock similar to what you are describing. Is there any way you could post something like a sound clip of the knocking? Member
Join Date: Dec 2011 Location: Belmont NC Posts: 119 Likes: 0 Received 0 Likes on 0 Posts Year: 1996 Model: Cherokee Engine: 4.0 Your profile doesn't state where your at. Plus, do not go to "Pep Boys" for anything. Find other XJ owners and partner up or at least find out where they go. CF Veteran
Join Date: Nov 2010 Location: In the middle of Minnesota! Posts: 5,727 Year: 1999 Model: Cherokee Engine: 4.0 Quote: Originally Posted by mtnance Plus, do not go to "Pep Boys" for anything. I would tend to agree with that. I'd recommend you find an independent shop. Ask aroundfor recommendations if you are unsure of where to find one. Senior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0
This is a link to the sound I am having Member
Join Date: Dec 2011 Location: Belmont NC Posts: 119 Likes: 0 Received 0 Likes on 0 Posts Year: 1996 Model: Cherokee Engine: 4.0 Hard to tell on the video,..almost sounds like a vaccum leak (like a pump) or an exhaust gasket I assume those are ruled out. Are we leaking (fluids) anything at anytime? Senior Member Thread Starter
Join Date: Feb 2012 Location: Annapolis,MD Posts: 698 Likes: 0 Received 0 Likes on 0 Posts Year: 2000 Model: Cherokee Engine: 4.0 This video is not my Jeep, it's one I found on YOutube that sounds like mine. I'll be able to actually post what my vehicle sounds like when my daughter gets home fro church. No fluids are leaking. There is no hesitancy in starting.Nothing has been really ruled out because the mechanic just listened to it ,checked the oil and said replace bearing, another one said replacing bearing is a band aid fix;replace engine. Right now the engine light is on because the coil pack needs to be changed. I've been recovering form surgery and was going to get the work done this week. The lady I brought this from has maintained this vehicle very well and the shop that had been servicing the vehicle verified all the service. She was always on top of oil changes, the only thing that I did when I got it was change the spark plugs because the engine light came on with a misfire code. The plugs were rough looking. CF Veteran
Join Date: Mar 2009 Location: Watha,NC Posts: 1,208 Likes: 0 Received 1 Like on 1 Post Year: Jeepless at the moment Quote: Originally Posted by tjwalker The reason I'm asking these questions is that some 00-01 engines can have the cylinder head crack between cylinders 3-4 because of a casting defect. That can result in low oil pressure, having to add coolant, and sometimes a knock in your engine. Not saying that is what is going on with your engine; just asking questions to try to help you isolate this a bit more....... You say you've owned it since Nov. Did you find any receipt for any repairs, namely a cylinder head replacement. As prolonged exposure to coolant can lead to worn bearings, therefore a knock. http://www.jeepsunlimited.com/forums...d.php?t=391831 Regardless, probably a good idea to read this anyways. Member
Join Date: Dec 2011 Location: Belmont NC Posts: 119 Likes: 0 Received 0 Likes on 0 Posts Year: 1996 Model: Cherokee Engine: 4.0 This may be a long shot but have you removed the spark plugs and checked for bits of anything on top of the pistons? I would think you would have heard a noise before if a bad plug had a piece left over, so I realize it's a long shot. Why is my jeep making a knocking sound?Conclusion. Knocking and clunking noises on Solid front axles are a common issue. Get underneath your Jeep or get it on a hoist to inspect all bushings and rubber mounts for tears and cracks. Inspect your driveshaft U-joints as well as your axle shafts for excessive play, wear, and lack of lubrication.
Why is there a knocking sound coming from my engine?Many things can cause engine knocking or banging. Common causes are: carbon buildup in the combustion chambers or on cylinder walls, lifters or connecting rods, combustion timing out of sync, overheated engine, back pressure from the exhaust, vacuum leaks, fuel octane or quality, spark plugs, or knock sensors failing.
How do I get my engine to stop knocking?How to Fix Engine Knocking. The first step in trying to fix engine knocking is to upgrade to gasoline with a higher octane rating. ... . Give your engine a tune-up that includes new spark plugs and wires.. Regularly change the oil in your vehicle and monitor for a low oil level.. Why is my Jeep Grand Cherokee engine ticking?The most common reasons a Jeep Grand Cherokee engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak.
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