Say, I just bought an 06 Sierra 1500 4.3L 66,000mi
And I'm in the process of going through it
I have changed the fluids, and I'm going to flush the radiator as well,
I threw a code 128, Thermostat
So I swapped out the thermostat belt and tensioner
I noticed when I was changing the thermostat that the tensioner was jumping quit alot and I was getting a clicking noise under the hood while I was
driving it as well

Question: Is it normal for the belt tensioner to jump around on the belt
like that ?
My other trucks never did that

Question#2 Where is the best place to bleed off air
in the cooling system

Also I installed a gator back belt and it quieted down
quite alot under the hood
In case anyone else was wondering

Any futher recommendations while I'm going through this new to me truck

I am clueless when it comes to late model Silverado's


Thanks, fella's

 

Ahhh okay so you don't participate around here much,

I belong to the Corvette Forums and answer quite a few Questions over there, I Also do Write up's

The 4.3L motor is new to me (DD)

Thus far I have swapped the plugs and wires

I elected to use NGK TR 55'S Gapped at .60
I swap plugs in my car every 20k miles so using copper cores suits me fine

Also I replaced the cap and rotor and swapped out the trans and motor oil

I like castrol full synthetic (motor) Castrol DEX IV (trans) and run Bosch oil filters

The plug,cap,and rotor swap truely smoothed out the Idle and throttle response is much quicker,
I put a gator back sepentine belt on and this further quieted down some of the noise from in under the Engine Baie

Today I'm going to flush the cooling system and then bleed the air out of the cooling system

Also I will swap out the PVC valve

I'm working 12Hrs tomorrow so that will be about it for today

Keep you posted

 

Has the code retured since you replaced the thermostat? How about posting up some pics of your truck

Please do keep us posted !!

 

Thanks for the response,

No the code has not returned lol atleast yet

This Truck is my Daily Driver

So Far I really like it



Since this is a Chevy Forum

Here's The Beast

 

Sweet rides man

 

Thanks !

I like my Chevy's