Question about 2002 Jeep Grand Cherokee

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I have a 2002 jeep grand cherokee high output 4.7 8 cylinder engine. i change the oil with synthetic oil every 3500. mechanic said that one of the cylinders has no compression. what could be the problem?

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The lack of compression can be the result of a bad valve, a bad ring, or a bad head gasket. You'll need to do a leakdown test to deterine where exactly it is leaking.

Posted on Sep 01, 2010

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What type of engine oil should i use for my 2002 jeep grand cherokee


I've had Jeeps for the past thirty years and in every one I use a good grade of synthetic oil. I generally run a 20w/50 but 10w 30 or 40 is fine. I use Amsoil because it lasts far longer than others do but any good name brand synthetic is fine (hint: Walmart synthetic is made by Quaker State and is just fine, you can change it at 4K -5K miles without problems.)
Always use a good quality filter...ones rated at the smallest micron filtration protect the best. Think of your oil filter as your kidneys. The better they are, the better you feel!!!

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It may be that the oil pressure switch is faulty. Find the oil pressure switch and unplug it and see it it goes to the min. If it does I would suggest getting a new switch. Also, the oil pressure switch wire might be grounded out against the body or the motor somewhere.

Jan 05, 2011 | 2002 Jeep Grand Cherokee

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Personally, I'd use 10 W 30 or 40. along with an additive like marvel or lucas. Or, change over to a good synthetic. don't use cheap oils...they generally are paraffin based and cause sludge.

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1 Answer

What is the recommended weight engine oil for a 1996 Jeep Grand Cherokee Laredo with a 4.0L 6 cylinder engine?


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1 Answer

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If the weather in your area is colder than normal, your startup oil pressure will reflect this, essentially because it is much thicker when very cold. This high reading should drop to "normal" once it reaches operating temperature. This condition can also be caused by a sticking pressure relief in the oil pump, usually caused by sludge inside the engine. If you regularly maintain your vehicle and use good quality oil, this should not happen. The oil pressure sending unit is also suspect, but in your case, I would not put it at the front of the list. If oil is close to "change time" consider using a good synthetic oil (synthetics flow better at extreme temps) or using a 5W anything oil during winter months. (see manufacturers specs)

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1 Answer

2002 2002 Jeep Grand Cherokee Larado


Check out all info on Edmunds.com There should be a detailed list if you wanna go by the book. If youre wanting to keep it simple just do the major items

Replace trans fluid and filter
Have gear oil checked in rear-end and transfer case
oil change (preferred synthetic and performance filter)
air filter (high performace)
spark plugs and wires
have ball joints and u-joints checked and entire undercarriage greased
change all o2 sensors (helps with mpg)

That should be penty good enough for another 20k miles before major check up. Stephen

Aug 24, 2008 | 2002 Jeep Grand Cherokee

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