Q: Oil pressure fluctuating and clicking noise from engine.

asked by on

I have a 1995 Jeep Grand Cherokee with a 5.2L v8. About 80,000 miles. I recently had an alignment done, and now I am having trouble with my oil pressure. (Probably not related.) When the engine is idling, the oil pressure is about 2/3 of the way up, and as I speed up, the oil pressure gauge wiggles and twitches, and sometimes drops to about half way. When I drive fast, (60mph or faster), the gauge stays around the 2/3 mark.

What concerns me most is that there is sort of a clicking noise coming from the engine. It doesn't sound quite like a "no oil" piston slap or whatever, but still it doesn't sound good.

I had the oil changed after it started, and I've checked it several times, and the oil levels are good. Also, no check engine lights or anything, and the engine temp and voltage and idle and everything seem normal.

My car has 80000 miles.
My car has an automatic transmission.

Hi there. The noise seems to be a lifter tap. Either a lifter is stuck or there is no oil to the lifter causing the rocker arm to tap and creating the noise you are hearing. Try putting one quart of Ford Type - F automatic transmission fluid in the engine and running the engine for 15 minutes at 3,000 rpm’s. This will thin out the oil to help clean up the lifters. Then change the oil and the filter with new oil and a new filter. This should clear up the lifter tap. However, if the noise does not go away, then I recommend replacing all of the lifters and cleaning out the push rods. If you need further assistance with your lifters tapping, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Oil pressure fluctuating and clicking noise from engine.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I installed a new fuel sending unit the gas tank is full and it shows empty when u take all gas out it shows full what could it be

It sounds like you put in an incorrect sending unit or it is defective and needs a replacement. The fuel sending unit will vary resistance from low to high resistance controlling the gauge. If the signal from the sending unit...

Q: I have valve lifter noise on the right side of my engine.

The lifter is tapping as either the oil pressure to the lifter has dropped or the lifter is sticking from old sludge build up from the mileage. Try changing the engine oil and filter and see if the lifter noise...

Q: truck is ticking.

Hello, thanks for writing in about your 2001 Grand Cherokee. It is possible that a cracked flywheel will make noise and also cause the crank position sensor to be given bad information. That may be the source of the Check...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...