Problem Description and Possible Solution
A ticking noise may be noted from the engine valve train area. This is commonly caused by varnish build up in the hydraulic lash adjusters (HLA). Our technicians tell us that using Mobil 1 synthetic oil has been successful in cleaning the varnish deposits and quieting the lifter noise.
Average mileage: 176,300 (100,000–275,000)
Engines affected: 3.2L V6, 3.5L V6
20 people reported this problem
The ticking was minor and only upon the first few minutes of starting the vehicle. Now it is constant and louder. I just changed the oil and put a new filter in as well as synthetic high mileage oil. I noticed the oil pressure stays really low unless I am accelerating and then upon idle it goes very low again. However, no warning lights have appeared on the dash. I am still paying for this vehicle from the prior owner. How costly would it be to have this repaired? Does it HAVE to be repaired to prevent permanent damage? Any help is very much appreciated as this is my ONLY vehicle at the moment. I am a mother of two and work full time so I am very worried.
I have had a ticking noise in the left bank of the motor (passenger side) and thus far I have run a 5 min motor flush through it and changed the filter and drained it, then put 3 qts of oil, 1 qt of transmission fluid (because of the high detergents and low viscosity it can be a good cleaner), and a qt of extra detergents in the engine, ran it for a 100 or so miles, then drained it again and put 4 qts of Pennzoil 20W-50 oil and 1 1/2 qts of Lucas Oil Stabilizer (the really thick stuff). So far this has still not solved the ticking but I still have around 80 Psi oil pressure so I don't know what to do next. This problem remains unresolved.
My trooper doesn't always have a tapping noise, but when it does it is generally after it has been running awhile.
My oil pressure also runs low when idling. Not sure if this is an issue or not, as my 1995 z71 does the same thing.