7.3 Intermittent Knocking

**sevenmalards** · #1 (**permalink**) 01-04-2009, 08:31 AM

I notice a few days ago that there is an intermittent knock when my truck is running. I heard it loud and clear yesterday when I was idling at a stop light. It will idle real smooth and normal then it will knock two to three times then go away. The RPM's don't fluctuate when I hear the Knock either. I only have 250K on the ticker so I'm hoping it's not a main or rod bearing or wrist pin going bad. Anybody have any ideas?

Lloyds71Mav · #2 (**permalink**) 01-04-2009, 09:44 AM

could be water in the fuel put some fuel treatment in it. I thought my John Deer 250II skid steer spun a bearing with a 100 hrs on it and it was water it sucked up it was knocking like crazy for a few seconds and then it would quit. Only guess I have Hope it is not anything bad. good luck.

**sevenmalards** · #3 (**permalink**) 01-04-2009, 10:29 AM

I'll check my fuel filter, but the "water in fuel" light hasn't come on

**sevenmalards** · #4 (**permalink**) 01-04-2009, 10:29 AM

Anybody know if it could be an injector?

rffpsvb · #5 (**permalink**) 01-04-2009, 10:32 AM

do an oil change see if it makes a difference, mine always runs better for a few months after i change the oil

**sevenmalards** · #6 (**permalink**) 01-04-2009, 10:34 AM

Quote:

Originally Posted by rffpsvb

do an oil change see if it makes a difference, mine always runs better for a few months after i change the oil

That isn't the problem. I just did an oil change less than 1000k ago with Amsoil oil and filter, it's all I've been running in my rig for a few oil changes now.