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?
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. 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: Knock sensor 1

Hello there. The knock sensor code can have various causes on your 2004 Chevrolet Silverado. The knock sensor circuit low, bank 1 code is telling us that the knock sensor in bank 1 that it has low circuit voltage. This...

Q: Does the alternator and starter work together

No, they do not work together. The starter motor relies solely on stored energy in the battery to function. It is only after the engine actually starts and runs that the alternator can provide power to vehicle systems as well...

Q: 2009 chevy cobalt check engine light an low fuel and power sterring

You have several issues but to prioritize, you should have the check engine light issue(s) investigated and resolved first. Following that, if there is a power steering malfunction, that would be addressed and finally if you have a faulty gauge...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.