Fuel Injector question

[Skippy987]

New to the forum and this is probably a redundant question but here goes.

Chasing the dreaded Hemi tick in my 2012 1500 5.7, 117,000. Fairly convinced its a lifter, but the more I read the more confused I get ,so looking for opinions before tearing into the motor. The tick is fairly loud at first start (low rpms), but as the oil warms to operating temp it becomes much quieter. The noise is much more pronounced when I put the truck in gear. Seems to be only at low rpm, but difficult to tell. Here's the mystery I need some help with, when I disconnect #5 fuel injector the noise goes completely away. My confusion is if its a lifter shouldn't it continue to make the noise?

Any help is greatly appreciated!

 

[Scottly]

Sure it's not an exhaust leak at number 5?

 

[Skippy987]

Nope, I resurfaced and replaced the exhaust studs 3000 mile ago.

 

[HEMIMANN]

You may indeed have a bad injector. I'd find it unusual to have piston slap from only a single cylinder. Neither does it seem to be a lifter because the lifters are actuating full time regardless if the cylinder is combusting.

True the exhaust lifter will under more load when opening during combustion, but you would still hear the damaged ticking even if not combusting.

 

[erikbro]

New to the forum and this is probably a redundant question but here goes.

Chasing the dreaded Hemi tick in my 2012 1500 5.7, 117,000. Fairly convinced its a lifter, but the more I read the more confused I get ,so looking for opinions before tearing into the motor. The tick is fairly loud at first start (low rpms), but as the oil warms to operating temp it becomes much quieter. The noise is much more pronounced when I put the truck in gear. Seems to be only at low rpm, but difficult to tell. Here's the mystery I need some help with, when I disconnect #5 fuel injector the noise goes completely away. My confusion is if its a lifter shouldn't it continue to make the noise?

Any help is greatly appreciated!

Have you figured out the problem? I have the exact same issue but on #8 cylinder.

 

[erikbro]

Have you found anything on this issue? I have the exact same problem with #8 cylinder.
Thanks