Question about 1999 Jeep Grand Cherokee

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I have a 99 jeep cherokee just replace the alternator and the a sensor it starts now but its makeing a knocking noise i was told that a quick oil change my do the trick or it could be a burnt rod can my car be fixed with out having to buy a new motor?

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DO NOT!!!!!!!!!!!!!!!!!! change oil old oil thick need new lifter

Posted on May 01, 2010

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1 Answer

2005 jeep cherokee engine knocking and blowing oil


blowing oil where.?

SMOKE or liquid oil.

but id be all over noise, and liquid oil, like a wood pecker finding grubs.

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First confirm the oil level is adequate by checking the dip stick. If the oil level is okay you may have a partial blockage that is starving the oil line leading to the sensor. Missed regularly scheduled oil changes may result in this happening.
If sludge is the problem your dealer can recommend an oil additive that may clear out the problem.
You may also have a failed sensor as well.

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This is a bearing knock, as the bearing gets looser and looser the oil pressure drops due to leak by.

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Does 2002 Jeep Grand Cherokee V8 have hydraulic lifters? I posted a question a few days ago regarding engine loud ticking which sounds like lifter noise. It doesn't have that deep sounding knock. I went to...


I would not believe any thing some parts store loser told you. Theres not a V8 built that doesnt have hydraulic lifters, unless its some fancy racin engine. It has hydraulic lifters, but unless you dont change your oil every 5k miles and/or use some cheap oil, there should be no problems. You should have a real mechanic look at it, and verify that you have good oil pressure. If it does, I would change the oil and use some MOBIL 1 and drive it, the oil will clean the lifters somewhat. If the eng has low oil pressure, that will need to be addressed.

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1 Answer

2001 Jeep grand cherokee motor knock 4.7 motor


First, if the noise is from the upper part of the engine and is more of a tapping than a knock, likely you have a problem in the valvetrain, most often a bad lifter or worn rocker arm. If the noise is low, deep inside, the noise is from a bearing. This is generally accompanied by lower than normal oil pressure. Regardless of the underlying cause, correcting the cause will not stop the knock. To do that correctly, the engine needs to be removed and all crankshaft bearings and the crankshaft itself need to be replaced (crank can sometimes be "undercut" and thicker bearing shells can be used depending upon the amount of wear.) If caught very early, sometimes only one bearing can be replaced in-car, but in 99% of all cases I have ever seen, most will fail again, sometimes more severely if done this way.

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Likely you need more than one (not rod, but rod bearings) In most cases you get knocking noise and low oil pressure as symptoms. If caught early you can do this in-car otherwise engine needs crankshaft and all bearings as well as new pump and system flush.

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1 Answer

Valve knocks when running reaches 1500 rpm


First, nothing you have done has anything to do with valve tappet noise. What is your oil pressure? Have you positively identified the noise as a lifter (tappet), OR COULD IT BE AN ENGINE BERARING OR WRISTPIN? Other than tearing it down and replacing lifters, rockers or pushrods or possibly even the cam, if oil pressure is good, change the oil and put a quart of Marvel oil in there. If that does not clear it up in a few days, you will have to go inside the engine. You likely have over 160k on that engine...consider using a replacement. Get an older tech to listen to it...it takes years to be able to differentiate between different component noises with any accuracy.
Personally, without hearing it myself, I'm betting it's a rod knock.

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1 Answer

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it sounds like the engine isnt getting enough fuel. I would suggest changing the fuel filter and possibly testing the fuel pump to see if it is bad.

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