I've noticed a couple of times now throughout the winter, when I start my truck usually first thing in the morning after sitting all night there is one single knock right when the engine fires up and then that's it it seems to idle and run fine. If I shut the truck off right away and then start it again it doesn't do it again. It happened today though after the truck had sat only an hourish. I am just wondering if anyone could tell me why it would knock? Is it something to be concerned about? Or is it just cold?
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Jamesram
I'm not sure, it's not a rattling it's just one knock right when the engine is firing up. It wasn't cold today, it was like +3 Celsius today
How about a injector leaking and putting a droplet of fuel in combustion chamber. The extra fuel in chamber ignites along with regular injection and fuel knock happens.
^ I agree.
the high pressure-riser associated with the
auto-ignition of fuel during the premixed combustion stage that produces the characteristic
“knocking” noise widely associated with
diesel engines. This noise is often
referred to as diesel knock
or
combustion roughness
the high pressure-riser associated with the
auto-ignition of fuel during the premixed combustion stage that produces the characteristic
“knocking” noise widely associated with
diesel engines. This noise is often
referred to as diesel knock
or
combustion roughness
Okay good to hear, kind of figured It was probably normal but this was my first winter owning a diesel and still getting used to it lol it's definitely different then a gas engine
It's normal mine does it all the time if I do not let the heater cycle when it's cold. It sounds like an old 12 valve for a split second when popping off.
Did anyone ever find out what the single knock at start up was? I’ve owned my truck four years and have never heard this till now.
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