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: A bad lifter will not make a knocking noise...

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.

Need advice from certified mechanic? Get help now!

Over 1000 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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Passenger side electric window intermittently will not go down

Hi there. Thanks for writing in about your 1999 Chevrolet Silverado 1500. There could be several causes for your passenger window to only work intermittently. But with the conditions you described, you will most likely need a replacement motor and...

Q: Need advice on whether or not brake fluid should be replaced on my car

The brake fluid in all cars should be changed to prevent the fluid from turning black and creating sludge buildup in the system. This will also keep the internal system from causing wear on the rubber seals and components. The...

Q: What does the Engine Overheated -- Idle Engine message mean?

The Engine Overheated – Idle Engine message can appear on your driver information center (DIC). When the DIC displays this alert, your engine is too hot to drive safely. You should stop your car as soon as possible and let...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...