corbett

I have a 01 chevy 2500 hd with A 6.O when you accelerate hard it knocks kinda loud i have also noticed recently when you shut it off sometimes for 10 to 15 seconds steam slowly comes from both tailpipes what do you think it could be i have changed the plugs and wires last week could it be the head gaskets its not running hot at all and it has good oil pressure

corbett

any help at all

corbett

come on no one can tell me anything.

kevinkpk

More info needed.

corbett

like what type of info pretty much gave you everything

kevinkpk

Whats the coolent level, any coolent in the oil, is it running hot, has it ever overheated, what is the outside air temp, anything changed when it started doing this, is it steam, or white smoke, is there any water comming out of the tail pipe?

corbett

coolant is fine and nothing else has changed and temp in the 70s and like i said i dont know if its smoke or steam

kevinkpk

Does it run ok? Any check engine light?

chevyboy1993

my 95 1500 does the same thing and it is white smoke but it's not a coolant problem, i know that because i redid the entire cooling system along with head gaskets. i'm stuck also

cleveland63b

if you have white smoke something is burning that shouldn't be more than likely coolant

as for the original poster its hard to say without being there to hear and play with it....is it rpm responsive?? internal engine or external knock?