anw7405 wrote:
Good news and bad news:
Good: The transmission cooler worked great. Highest temp of the trip was 190 but normally stayed in the 170's.
Yes, good news and telling that the OEM aux cooler wasn't sized large
enough. Either for the load or the higher heat generated by the 'condition'
of the tranny.
'Condition' might be that it is worn/wearing out/etc so not as efficient
therefore generating more heat...or the load is over it's ratings of
that 'condition' of the tranny
Bad: Only made it about 20 miles before the engine light came on and the noise started.
So you have eliminated the tranny's contribution to the overall heating
of the main radiator...
So it can be that the engine isn't able to manage that level of load,
previous knocking sessions caused the engine to weaken (could be pistons/valves/etc
to burn (melt), to something in the CC
As said, knock can ruin an engine real fast if left in that knocking
condition
Am assuming highest octane you can get, that there isn't any mod's
to the engine (tune, etc).
And back to what Turtle said earlier...check your cooling system and
especially the 'stack' (AC radiator, ATF Aux radiator, main radiator).
Also, OATs coolant and the issue(s) with oxygen getting in there to
turn DeathCool into acidic, gelatinous globualls that will plug up
the radiator(s)
Truck is at the GM dealership now. Hopefully they can figure it out.
To the denali owners. What oil pressure are you running while towing 2500-3000 rpm's? I'm only running about 25. I don't feel like that is enough. Thats my only explanation for the noise and oil temp. I know the oil is hot because that is the first thing I check when it starts making noise. It smokes a little out of the dip stick hole when i check it.
