Start up knocking
Thread Starter
Launching!
Joined: Mar 2022
Posts: 247
Likes: 32
Start up knocking While I was doing some data logging, I noticed that I my pcm was detecting knock upon start up only as the engine was cranking over. Roughly 2000 - 800 knocks. I really figured this was nothing, however I was just curious if this was a symptom of something else or just something to ignore entirely; standard start up sounds for example.
I want to say in the back of my head from a million years ago I saw or read this happen while someone somewhere at some point in time was data logging, and it was no big deal. Have you done a search to see if others have any input on this?
TECH Veteran
Joined: Dec 2008
Posts: 4,147
Likes: 62
From: Little Rock, AR
You will generally get some knock counts just from the engagement of the starter. So, if this is the only time you get it, then it's not a real problem unless your starter is loose, bendix floppy or gear mesh is not so good.
Thread Starter
Launching!
Joined: Mar 2022
Posts: 247
Likes: 32
I have yes and they were having actual mechanical issues. But my engine is running fine. Not even burning oil.
Thread Starter
Launching!
Joined: Mar 2022
Posts: 247
Likes: 32
Is that so ? Okay I didn’t even think about that one. I’ll keep and eye on it but you are most likely right.
