Emissions frustration. Monitors are still reporting code.

[SERVED_USMC]

When I put the motor back in I forgot to plug in the evap hose that runs from the front of the intake back into the bottom of the sensor. I threw a large evac leak code until I plugged it back in and cleared the code. Since then, it has been 3 months and approx 700 miles of driving. It failed for the third time yesterday because the monitor is still reporting it even though there is no code. I dont what else to do.

Its not my daily driver, but I thought for sure it would have passed by now with the time that I have on it. What the hell do I do?

[Iam Broke]

I thought our EPA nazi's let you have one system not ready?

Do you mean it has a pending code?

To set the evap ready it takes several drive cycles from cold start with less than 3/4 tank and more than 1/4. Long steady speed trips like 45-50 on a country road, no starts or stops. It's a hard one to get ready.

[Iam Broke]

Here's a complete drive cycle...


The OBD II Home Page - On-Board Diagnostic System Information
Autotap® OBDII Diagnostic Scanner
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:

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.
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.
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.
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.
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.
Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
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.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

[SERVED_USMC]

Originally Posted by Iam Broke

Here's a complete drive cycle...


The OBD II Home Page - On-Board Diagnostic System Information
Autotap® OBDII Diagnostic Scanner
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:

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.
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.
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.
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.
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.
Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
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.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Jees, Im gonna need a runway.

[RACERJOE1]

SERVED_USMC - I agree, it seems a little complicated, you'd think in the 21st century electronics could be less complicated to work with, wish I had another answer for you though.
BTW - Semper Fi

[Iam Broke]

Two 50 mile cruises on State highways set all of mine ready except the evap from a cold start after a tune flash. As I posted earlier, I thought Indiana let one not ready slide. I have two years until I have to put my cats on & fool them.

There is a show car exemption if you drive less than like 2500 miles a year, it's on the Clean Air site someplace.