Normal high mileage engine noises
07-25-2017, 12:14 PM
#1
Normal high mileage engine noises
I have a noise that this engine has had as long as I can remember but have only had it after 100k miles. It almost sounds like the old GM Iron Duke 2.5L 4 cylinder with the Phenolic timing Gear and steel crank gear. They would knock at idle and light load.
This 2.4 has the same type of knock that I can only hear inside and under very light to no load in first and second around 3000 rpm. If any load or even cam timing comes in it gets softer or goes away. I can't hear it under the hood with the rest of the noise or even with a stethoscope.
I am guessing worn timing chain / guides but the rhythmic light knock is strange. Is this one of the 2.4's common high mileage noises?
07-26-2017, 10:51 AM
#5
Although it is an auto, I feel the noise is engine related. Much quieter when the oil is cool and a little thicker... Mobile 1, 5-30. Don't these have timing chain and guide or pin issues that can cause a rattle ?
07-26-2017, 11:23 AM
#6
Some of them had issues with faulty timing chain tensioners though I'm not sure what year they started using the "upgraded" design. Supposedly my car (2006) used to have the "faulty" timing chain tensioner though it never gave me any problems up to 100,000 miles. It's really pretty easy to change out though if that is your issue.