Low speed knock on 5.7 Challenger auto

[maddog136]

Developed a Low speed knock on my 2010 Challenger R/T auto, most notable when climbing hills at 20 mph around 1500 rpm with a 93 CAI tune. Goes away when I power through it. Tried 91 and stock CAI tunes no help. No codes. Originally on Shell 93, now on Chevron 93, no help. Installed a new intake manifold last year, so it should be clean. Suggestions?

Mopar CAI, Mopar/Corsa sport cat back exhaust, catch can, speedlogix fuel rails, stock injectors, 190 degree thermostat.

[mikel]

are you seeing this in logs?

[maddog136]

I am new to data logging. I have the predator P/C interface cable and the driver cd. Can you reference me a tutorial so I can get started?

[maddog136]

I hope learned enough on youtube to create my first data log. My laptop battery is too old to go for the ride. I selected a lot of parameters, especially all of the ones for the knock sensors. Again, knock/ping occurs at 20-25mph, around 15-1700 rpm.
Flat road or hill.

steinbrennerRT_ping1.log

ping data log

(643.22 KiB) Downloaded 273 times

[maddog136]

I test drove and data logged a bunch of parameters, including LT and ST KNK. The knock is audible, but not affecting engine performance. During the ten minute log I reviewed, several ST and LT KNK occurances were registered during different driving conditions. I cant tell if what I'm seeing is normal. If it was not for the audible knock I wouldnt be checking. A freind went along for a test drive and pass while listening inside and out. He cant be sure if it is a real knock or something like a heat sheild rattle. I''l be going under the car monday morning to rule that out. Is there anyone on this forum that can help me to interpret the datalog parameters I posted? Thanks in advance.

[Mike_Levy]

If its audible is almost certainly not knock. You will never hear knock on modern engines. The knock sensors will pull timing way before it gets that bad.

[maddog136]

The knock turned out to be an internal noise coming from my right hand front muffler. I have a Corsa Sport / Mopar Performance cat back exhaust. Working through the warranty process from corsa for a replacement now. Thanks for all the comments.

[mikel]

good to hear (see what I did there?) LOL.