One of my 3500's started pinging, like the sound you would have in a gasoline motor when you have 12:1 pistons and try to run cheap fuel through it. It does it not at WOT but at a light throttle. Seems to be getting louder too! Anybody have ideas on the pinging cause??:humm

I think its maybe an injector?? I have had the same BD 110 sticks in for about 10 years now. I have been faithful putting injector cleaner in all them regularly. I could be wrong though. Someone on another site suggested the MAP sensor so, I am now in the process of replacing that, had a spare thank God. I am open for any reasonable suggestions.

The only thing wrong with the truck is the damn O-ring connecting the power steering to the vacuum pump is leaking, but I don't think that has a bearing in it to make that sound.

Thanks,
Steve

 

The vacuum pump wouldn't make that noise. But it does sound like a spark knock.