BYE 5.3, HELLO 6.0

[iamdub]

^^^^ Awww, c'mon! You're starting out with a perfectly clean motor! $100 (or less) is a wise and relatively minimal investment both cost- and labor-wise to keep it clean. Greatly reduced carbon build-up on the pistons, no puddled up oil in the intake... They're a no-brainer and should've come installed from the factory if the engineers couldn't have solved the problem otherwise.

Oh- and to those asking about the crank relearn: First off, VATS is a security function and has nothing to do with the crank relearn (or whatever of the many terms as to which it is referred). The crankshaft position sensor works with the camshaft position sensor to keep the PCM informed of timing and firing events to more accurately detect misfires. Due to variations in build tolerances, engine wear (slack in the timing set), etc., not all engines will pulse the cam and crank sensors at any one specific synchronized time during the engine's rotation. They'll be plenty close enough for the engine to run, but will not be optimized and can cause the PCM to not accurately detect misfires or even falsely detect misfires that don't exist. Because every engine is different, the PCM needs to be put into a crank relearn mode so that it will see how the crank and cam sensors compare when everything is "normal" so it will know when something is "not normal".

 

[liftedtahoe]

^^^^ Awww, c'mon! You're starting out with a perfectly clean motor! $100 (or less) is a wise and relatively minimal investment both cost- and labor-wise to keep it clean. Greatly reduced carbon build-up on the pistons, no puddled up oil in the intake... They're a no-brainer and should've come installed from the factory if the engineers couldn't have solved the problem otherwise.

Oh- and to those asking about the crank relearn: First off, VATS is a security function and has nothing to do with the crank relearn (or whatever of the many terms as to which it is referred). The crankshaft position sensor works with the camshaft position sensor to keep the PCM informed of timing and firing events to more accurately detect misfires. Due to variations in build tolerances, engine wear (slack in the timing set), etc., not all engines will pulse the cam and crank sensors at any one specific synchronized time during the engine's rotation. They'll be plenty close enough for the engine to run, but will not be optimized and can cause the PCM to not accurately detect misfires or even falsely detect misfires that don't exist. Because every engine is different, the PCM needs to be put into a crank relearn mode so that it will see how the crank and cam sensors compare when everything is "normal" so it will know when something is "not normal".

Tueche' sir!

 

[Tonyrodz]

^^^^ Awww, c'mon! You're starting out with a perfectly clean motor! $100 (or less) is a wise and relatively minimal investment both cost- and labor-wise to keep it clean. Greatly reduced carbon build-up on the pistons, no puddled up oil in the intake... They're a no-brainer and should've come installed from the factory if the engineers couldn't have solved the problem otherwise.

Oh- and to those asking about the crank relearn: First off, VATS is a security function and has nothing to do with the crank relearn (or whatever of the many terms as to which it is referred). The crankshaft position sensor works with the camshaft position sensor to keep the PCM informed of timing and firing events to more accurately detect misfires. Due to variations in build tolerances, engine wear (slack in the timing set), etc., not all engines will pulse the cam and crank sensors at any one specific synchronized time during the engine's rotation. They'll be plenty close enough for the engine to run, but will not be optimized and can cause the PCM to not accurately detect misfires or even falsely detect misfires that don't exist. Because every engine is different, the PCM needs to be put into a crank relearn mode so that it will see how the crank and cam sensors compare when everything is "normal" so it will know when something is "not normal".

How do you do a crank relearn? What's the process?

 

[iamdub]

How do you do a crank relearn? What's the process?

I've never performed one nor am I a mechanic. But I know it can only be done with specialized equipment such as a Tech2 or equivalent scan tool because it is needed to initialize the learning mode in the PCM. This is why it's something that is performed at a mechanic shop or dealer. You'll be in the waiting room far longer than how long the actual process takes, which is maybe 2 minutes for a tech taking his time.

 

[liftedtahoe]

I've never performed one nor am I a mechanic. But I know it can only be done with specialized equipment such as a Tech2 or equivalent scan tool because it is needed to initialize the learning mode in the PCM. This is why it's something that is performed at a mechanic shop or dealer. You'll be in the waiting room far longer than how long the actual process takes, which is maybe 2 minutes for a tech taking his time.

Glad i have ase certified mechanic friends with tech 2 lol, but i just ordered my catch can itll be in this week sometime! Thanks everyone for the advice, made me stop and look in the future i appreciate that!

 

[iamdub]

Glad you got the catch can! After sticking a borescope into a few of my cylinders when I first bought my Tahoe (a few months ago with 148,000 miles on it) and seeing a wet and shiny oil slick in the back of the intake manifold (these are supposed to by "dry intakes", right?!), I was really wishing it had a catch can long before I took ownership. That minimal investment and 15 minutes of work will prevent a lot of potential damage and drivability problems in the long run.

 

[liftedtahoe]

Glad you got the catch can! After sticking a borescope into a few of my cylinders when I first bought my Tahoe (a few months ago with 148,000 miles on it) and seeing a wet and shiny oil slick in the back of the intake manifold (these are supposed to by "dry intakes", right?!), I was really wishing it had a catch can long before I took ownership. That minimal investment and 15 minutes of work will prevent a lot of potential damage and drivability in the long run.

Yep nothing is suppose to be in these intake manifolds except air! I cant go by my last motor cuz i had oil sludge water well a lil bit of everything in the heads when i pulled the valve covers hahaha

 

[bottomline2000]

How do you do a crank relearn? What's the process?

It's a series of cycling the key on/off. I had to do a crank relearn when I changed pcms. I used my autocal when i loaded the 6.0 tune with my motor swap and I assume it did the relearn which was cool because it's time consuming to do with the ignition switch.

Sent from my SAMSUNG-SM-G900A using Tapatalk

 

[iamdub]

It's a series of cycling the key on/off. I had to do a crank relearn when I changed pcms. I used my autocal when i loaded the 6.0 tune with my motor swap and I assume it did the relearn which was cool because it's time consuming to do with the ignition switch.

Sent from my SAMSUNG-SM-G900A using Tapatalk

Never heard of that method. I'll have to research that. But, I'd still rather do it with a scan tool. It'll guarantee that it's done and done correctly.

 

[drakon543]

X2^
There are usually alternative ways to get the ecm/pcms to learn thier new positions but its faster and more effective to have the relearn triggered in the computer. Took me 3 tries to get a grand prix to trigger the egr home position relearn a few weekends ago. Plus some of these alternative methods are not 100% safe for what your trying to get set right. Few dollars spent on someone with a tech 2 or equivalent can save alot of time and possibly extra money.