How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: GMC
Satisfied Customers: 22649
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
Type Your GMC Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

I have had the lifters replaced but there is still a

Customer Question

I have had the lifters replaced but there is still a clacking especially at higher speeds
JA: What is the model/year of your GM?
Customer: 2005 yukon Denali
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: The head lifters have been replaced
JA: Anything else you think the mechanic should know?
Customer: The pedal sensor and the throttle body sensors have been replaced
JA: Which particular sensor are you asking about? And have any trouble codes been triggered?
Customer: Reduce engine power
Submitted: 12 months ago.
Category: GMC
Expert:  sprinkles08 replied 12 months ago.

hello and welcome to JustAnswer!

There are many things that could cause internal engine noise. You may have an oil delivery issue, it could be timing chain noise or a rod knock, possibly carbon knock, or you may be hearing piston slap. Piston slap happens when the pistons are slightly smaller than they should be in relation to the bore and the skirt slaps the cylinder wall as the piston changes directions.

Have any actual diagnostics been done to try to determine the source of the noise?