Firing Back Up

[rdnkcpa]

I have a 2004 5.3 V8 that I just replaced both heads on(after many months). I replaced heads & lifters. During the installation I had to rotate the engine to torque the rocker arm bolts. My questions are:

 

Will a crank relearn procedure have to be done? I did not remove any sensors, but I did turn the engine over by hand with the battery disconnected.

 

Any codes I should expect? Before I tore it down it was running perfectly, no CEL.

[redvett]

You should be fine as long as ALL grounds are installed.

[rdnkcpa]

Fired it up, no CEL's, no codes, just the sound of 8 beautiful American cylinders.

 

After sitting for 5 months and two new heads it runs great.

 

Only thing is now, the HVAC is stuck in defrost mode. It wasn't before I parked it. I have to figure that problem out next.

[redvett]

Try this.

 

When replacing the HV AC control module it will be necessary to allow the HV AC control module to perform a re-calibration process.

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper HVAC

performance will result.

Place the ignition switch to the OFF position.

Disconnect the scan tool.

Install the HVAC control module.

Re-connect all previously disconnected components.

Start the vehicle.

Wait 40 seconds for the HVAC control module to re-calibrate.

Verify that no DICs have set as current DICs.

When replacing the motor assembly it will be necessary to allow the HV AC control module to perform a re-calibration process. When installing the

motor assembly be sure to perform one of the following:

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper HVAC

perfonnance will result.

Preferred Method (\VI Scan Tool)

Clear all DICs

Place the ignition switch in the OFF position.

Install the motor assembly.

Re-connect all previously disconnected components.

Start the vehicle.

With the scan tool. initiate the Motor Re-calibration feature of the HV AC module Special Functions menu.

Verify that no DICs have set as current DICs.

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper

HV AC performance will result

Alternate Method (\VIO Scan Tool)

Clear all DICs

Place the ignition switch to the OFF position.

Disconnect the scan tool.

Install the motor assembly.

Re-connect all previously disconnected components.

Remove the HV ACIECAS fuse for a minimum of 10 seconds.

Re-install the HVACIECAS fuse.

Start the vehicle.

Wait 40 seconds for the HVAC control module to re-calibrate.

Verify that no DICs have set as current DICs.

[rdnkcpa]

Redvett- thanks for the pointers. Tried pulling the fuse and did not work. I ended up disconnecting the battery for 10 seconds then started engine. Let it cycle for 2 minutes without touching any HVAC controls. 1st time it corrected the settings of defrost, floor, bi/level, vent, but temp controls were not working they were stuck on hot. Moved the temp controls to hot, shut the truck off and disconnected battery for 1 minute, hooked it back up, started truck, let cycle for 2 minutes(just to be safe). That seemed to do the trick.

 

Thanks for everybody's help along the way. I have one little annoying exhaust leak i need to fix, but other than that, it is good to go.