Anyone have the drivnig cycle proceduere for a 99 silverado z71 5.3L? Gratz!

 

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
4. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
6. Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
7. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Reprinted on OBDII web site courtesy of General Motors Corporation
Š General Motors Corporation

 

Thats a nay on that recycle drive, had my: headlights on, cargo, dome, both cabin, a/c & stereo full blast. Oh! no rear defrost on board.
on the ob2 reading? Three monitors came up incomplete: CAT, EVAP & AIR

 

Sorry to hear that. Mine did the same after doing all that crap too. I ended up just driving it a little each day and a week later all monitors clear. Went and got my inspection done that day. I'm thing it's just age, wear and tear.It's got 165K on it. Runs good, all maint done it. This last time was after I changed oil, filters, plugs, wires. It never did this at 50K, 75K or 100K. Only in the last few years. Maybe I let it sit too much.

 

Shoot, I even drove 104 miles with the same result. Im hetting convern, never has this happend since i purchase the truck.

 

I reset the the enitre thing by disconecting the battery and holding both pos & neg tips together. Ran thecle for the 3rd time and this happen, But

 

Anyways, at the end of the driving cycle, all cleared out except (3): CAT, EVAP & AIR.
Thats were its at folks.

 

Letting your gas tank get below 1/2 full will help with getting the EVAP system to show it is ready. EVAP system needs to have a vacuum in the fuel system hold for a given period of time. Having less than 1/2 tank of gas helps ensure that the system creates an appropriate vacuum and maintains it for the proper length of time.

 

Update, im down to 3 IM codes
CAT
EVAP
AIR