Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: LIFTERS ARE KNOCKING on 2003 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
WHEN I START THE VEHICLE AFTER IT HAS SET A WHILE THE VALVES MAKE A LOUD KNOCKING SOUND I HAD NEW VALVE LIFTERS INSTALLED AND IT STILL KNOCKS. ONE OF THEM COLLAPSED AND THE MECHANIC REPLACED IT BUT IT STILL DOES IT. WHEN I GET THE OIL CHANGED IT WILL QUIT FOR A FEW DAYS THAN START AGAIN. I USE 5W20 OIL IN IT AS IT CALLS FOR.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
check the oil level if your missing oil fill to spec also get a lucas that always works good for me may work for you too.
THE OIL LEVELS ARE FINE IF I USE LUCAS OIL ADDITIVE SHOULD I USE SYNTHETIC SINCE IT USES 5W20 SYNTHETIC THE VEHICLE HAS A 104,000 MILES IS IT POSSIBLE THE LIFTERS ARE JUST BLEEDING OFF . IT HAS EXCELLENT OIL PRESSURE ON START UP AND WHILE DRIVING.
Didn't find what you were looking for?