Q: My truck has a knocking noise from a bad lifter

asked by on

In the past week or so truck (82,000 miles) developed a knocking noise (that I think is associated with a bad lifter). I had a mechanic listen and he confirmed that's likely what it is. Could I run synthetic oil to help the issue? It does seem to be louder when it's cold, and even then I can't hear it in the cab while I'm driving. I might do an oil change with a bottle of seafoam and see if it helps. I may end up taking it in either way, but I wanted to know if you had any advice.

A bad lifter will not make a knocking noise. It will make a tapping noise. I would recommend having a qualified mechanic listen to the noise to see if it is a lifter noise, a piston rod, or main bearing noise.

I suggest running synthetic oil either way and sticking to the recommended oil weights. Once the noise is located then a repair attempt can be made. If it is a lifter sticking then you can try the engine flush before the next oil change to see if it helps. Feel free to reach out to a qualified mechanic to help you with these checks, they will be able to properly pinpoint and fix the noise you’re hearing.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My truck has a knocking noise from a bad lifter

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: Q: Cold Starting Problems

Cold starting in the mornings, especially when cold is difficult for any engine as the engine will require much more fuel than normal during a cold start. When you start your car in the morning and turn the key to...

Q: My 2009 Equinox is overheating intermittently. It overheated in the summer and tnen not again for 3 months then twice in one week

Check the coolant level to be sure it is adequate. Of course, if the coolant level is low enough to cause overheating, you may have a coolant leak. If the overheating is intermittent that would point to a possibly sticking...

Q: Q: how to replace lower ball joints

Hello. If the ball joints have play in them like this then they need to be replaced. In order to replace them the vehicle will need to be put into the air and the old ones will need to be...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.