2000 Chevy Blazer Ticking /Tapping noise from engine

2000 CHEVROLET BLAZER

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Noises problem
2000 Chevy Blazer 6 cyl Four Wheel Drive 103000 miles

I recently started to hear a noise from the engine when i accel while driving, or if im in park and idleing and step on the gas. the sound gets faster when i step on the gas pedal driving but slows down and dissipates when the vehilce slows down. i just had the oil changed and service done at a jiffy lube. everything was checked, but the sound didnt start until after my car was serviced there. i have checked the oil, and for leaks, also for arching of spark plugs. And i noticed the oil pressure guage is jumping back and forthe from about 30 to 60 when the car is running and driving. Any Ideas?

Thank you

Jan 17, 2010 at 1:33 PM

MATHIASO

CERTIFIED EXPERT
1,209 POSTS

Hello_ There might be problem with oil pressure and the engine noise might be related to that. Restrictions in the pickup tube screen can choke off the flow of oil into the pump, reducing flow and pressure. Even a relatively small amount of varnish buildup on the screen can restrict oil flow at higher engine speeds. A coating only .005 inch thick on the screen will reduce the total "open" area of each hole to .030 inches, causing a whopping 44 percent reduction in oil flow.

The pressure relief valve can be yet another cause of low oil pressure if the valve sticks open or is held open by a small piece of debris. The relief valve is designed to limit oil pressure as engine speed increases. Sometimes the engine may become starved for oil at higher rpms because the oil is not returning quickly enough to the crankcase. The underlying cause here is usually severe varnish buildup that restricts the oil return holes in the head. and finally make sure it is the correct viscosity for the application.

Jan 17, 2010 at 3:02 PM