Question about Jeep Grand Cherokee

1 Answer

After starting vehicle, oil pressure will start to drop after running for about a minute and motor will start knocking.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Jeep Master
  • 6,982 Answers

When you first start your engine the oil is cold and somewhat thicker, therefore oil pressure is a bit higher. If your bearings are worn, as the oil gets warmer and thins out, they will begin to knock. If you don't drive it and have caught the condition early, sometimes you can just replace the rod bearings, and it will be OK. However, after removing the oil pan and inspecting the damage, if you find that the main bearings are also worn, the engine will need to be removed and all bearings must be changed.(use "plastigage" to determine bearing wear) I strongly recommend that you change the oil pump as well, to ensure that new parts get a good oil supply. NOTE: some people attempt to just replace the oil pump when this condition exists...It is a total waste of time, and will not work. I know that this is not what you wanted to hear, but its a fact!

Posted on Apr 15, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

1998 ford explorer oil pressure

Knocking in engine and low oil pressure usually means bad main bearings. May have been caused by bad oil pump or just worn out bearings due to high mileage. If this is problem needs engine or rebuild old engine.

Jul 15, 2012 | 1998 Ford Explorer

2 Answers

Engine knocks after starting and running after 2 minutes.oil guage dropped.let truck sit then started truck again ran for two minutes and started knocking this the oil pump and where is it located

yes it sounds like it,but check your oil too just to be sure ,your oil pump is in the oil pan take off oil pan u should see it,it will be on the sump end of the pan(caution) the oil pump on most vehicles are connected to the distributor so u might have to retime in eng after u do this,Hope this helps and good luck

Apr 05, 2011 | 2004 Ford F150

1 Answer

My 1996 dodge grand caravan back lifters are dry and not getting oil. heavy knocking. What could be the problem?

Dear Knocking,
It is a very very well possibility that you simply have "sludge" built up inside galley oil passages.The simpliest way to start off with this would be to install a motor flush chemical and let it run for about 20 minutes at idle, then drain the oil and install new, with filter.hile installing the new oil add an additive called "Seafoam" it's in a white can, use it per directions for the crankcase oil, start the vehicle and put a few to 50 miles on it, see where that places you, you should be impressed with the results.If that does not cure the carbon sludge build up, then it is an oil pressure problem.Get back to me if ya have anymore question, I'M HERE TO HELP!!!

Nov 22, 2009 | 1992 Dodge Caravan

1 Answer

No oil Pressure, with knock.

The first thing I would do is change the oil filter. Also, what engine do you have.

May 27, 2009 | 2000 Ford Expedition

1 Answer

1998 camaro oil pressure drops

no oil on ground oil still full but after it runs for a few minutes oil pressure drops

Aug 31, 2008 | 1998 Chevrolet Camaro

1 Answer


You should trust your oil gage. The oil pump is bad. You had better change it before you seize your motor.

Aug 06, 2008 | 1997 Chevrolet S-10 Pickup

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

386 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

76682 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides