If you have a service manual set on it's way, hold off on the compressed air and homemade smoke tester. Study the manuals and follow the test procedures exactly as described. Blowing that fuse may be a clue.

 

You got it Rusty but too late on the compressed air test but as for the rest I will and again thank you.
And one other thing do you think the higher amp alternator could be messing with the evap system in the book it says it,s very sensitive to changes in voltage as in weak battery gas level an so on.Also the tester having the ability to turn on the purge valve is a nice function and it may have been why the fuse blew in the first place when on the freeway I tried it but honestly don't remember when I first noticed the blown fuse just that it controlled the power for the purge valve and the MAF sensor,both wouldn't work until I put the fuse in then both started working fine again. you know I was hoping that when the purge was commanded to turn on I had hoped it would complete the rest of the evap test and reset. Didn't work though it might have been when I commanded it on so did the OBDII while on a drive cycle and both at the same time might just have blown the fuse.wont ever know for sure can't wait for that service manual like a kid in a candy store just want more and more knowledge so I really do understand how it works so I can easily fix it.

 

I was googling and found a post from the forum page 2 that has to do with a 2003 blazer 4.3 liter evap problem not completing or setting a code can you email me that article would appreciate it.Sound,s just like what I am going through.Sorry didn't know how to access it any other way.

 

We are going to need a little more info or a link or something. Everyone's Google results are unique to themselves. Your results, my results, the Captain's results etc... Will all be different.

 

Reads like this. Ok Captain-Page 2 Blazer Forum
blazer forum .com 2nd Gen Series (1995-2005)Tech
Jan 15,th 2016 The Evap system is in the PCM power train control 2003 Chevrolet Blazer Ok Captain is it still useless to me for my understanding a Mil or a recent code.And if it continues to not complete I have been told its a possibility... The Evap line on my 2003 Blazer l/s 4.3 liter
But its the rest of the post that I want to see.Page 2 Blazer forum

 

Sounds to me like you found one of your own old threads in Google. Didn't Captain put them all together into one since Jan 15th?

 

Have you tried the gas pedal thing again?? Worth a shot, but I'm not going to hold my breath

 

Here's something I found regarding the GM drive cycle. It's supposed to be Cadillac info (Cadillac manuals were always a far cut above the rest when I was in the business). was in a 2007 up Escalade forum. Seems you may be trying to do a cold start in too cold of weather, or not being patient enough to complete multiple cycles, or setting codes/clearing them too often, or maybe all. For what it is worth:

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Inspection/Maintenance (I/M) Complete System Set Procedure
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

Description
The purpose of the Inspection/Maintenance (I/M) complete system set procedure is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostics and complete the drive cycles for those particular diagnostics. When all I/M monitored diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform the Inspection/Maintenance (I/M) Complete System Set Procedure if any I/M System Status indicators are set to NO.

I/M Data List
To determine if the I/M readiness diagnostic tests can be run this ignition cycle, use a scan tool to observe the I/M monitor enabled parameters in the I/M Data List.

Conditions for Meeting a Cold Start
• The ignition voltage between 11-18 volts.
• The barometric pressure (BARO) is more than 75 kPa.
• The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).
• The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
• The difference between the IAT and the ECT is less than or equal to 6°C (10.8°F)
• The ambient air temperature is between 4-30°C (39-86°F).
• Fuel level is between 15-85 percent
• Without RPO LMG--The fuel alcohol content is less than 15 percent.
• With RPO LMG--The fuel alcohol content is less than 87 percent.

Circuit/System Verification
Review the Inspection/Maintenance (I/M) System Status indicators with a scan tool. All I/M System Status indicators should report YES.

Inspection/Maintenance (I/M) System Set Procedure
Important: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, do NOT turn the engine OFF for the remaining portion of the set procedure.
1. Ensure that the vehicle meets the conditions for a cold start listed above.
⇒ If the evaporative emission (EVAP) I/M System Status indicator displays NO, perform the EVAP Service bay test if available.
⇒ If the EVAP Service bay test is NOT available, it may take up to 6 drive cycles, with up to 17 hours between drive cycles, for the EVAP I/M System Status indicator to transition to YES.
⇒ If the O2S Heater System Status indicator displays NO, ensure that the ignition has been turned OFF for at least 10 hours.
2. Set the vehicle parking brake and ensure the vehicle is in park for automatic transmission or neutral for manual transmission.
3. Turn OFF all accessories; HVAC system, other electrical loads, including aftermarket/add-on equipment, etc.
4. Start and idle the engine for at least 2 minutes and until 65°C (149°F) is achieved.
5. Run the engine for 6.5 minutes within the following conditions:
• MAF parameter between 4-30 g/s
• Engine speed steady between 1000-3000 RPM
6. Return the engine to idle for 1 minute.
7. Apply and hold brake pedal, and shift to Drive for automatic, or apply clutch pedal for manual and operate the vehicle within the following conditions for 2 minutes:
• Depress the accelerator pedal until TP Sensor angle is more than 2 percent.
• MAF signal between 15-30 g/s
• RPM steady between 1200-2000 RPM

Important: Do NOT touch the accelerator pedal during the idle period. A change in TP Sensor angle or an increase in engine speed may invalidate this portion of the test.

8. Release the accelerator pedal and shift the vehicle to Park for automatic, or Neutral and release clutch pedal for manual, and allow the engine to idle for 2 minutes.
9. Quickly depress the accelerator pedal until TP Sensor Angle is more than 8 percent and return to idle, repeat 3 times.
10. Allow engine to idle for at least 2 minutes.
11. Release the parking brake and drive vehicle at 24 km/h (15 mph) or slower for 2 minutes.
12. Continue to drive the vehicle for at least 5.5 miles between 45-112 km/h (28-70 mph) with the vehicle reaching at least 80 km/h (50 mph).
13. Release the accelerator pedal for at least 2 seconds. This will allow the vehicle to enter decel fuel cut-off.
14. Depress the accelerator pedal until the TP Sensor angle is increased 3-20 percent and maintain a safe speed for 1 minute.
15. Safely stop the vehicle, with the engine in drive for automatic or in neutral with the clutch pedal depressed and parking brake applied for manual, idle for 2 minutes.
16. Shift to Park for automatic and apply the parking brake, or neutral and release clutch pedal for manual.

Important: Do NOT disturb the vehicle or turn ON the ignition until told to do so. Disturbing the vehicle may invalidate this portion of the test.

17. Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 45 minutes.
18. Observe the Inspection/Maintenance (I/M) System Status with a scan tool. All of the I/M System Status indicators should display YES.
⇒ If the EVAP I/M System Status indicator displays NO turn OFF the ignition for 17 hours, ensure that the vehicle meets the conditions for a cold start, and repeat steps 12-18 six more times, or until the EVAP I/M System Status indicator transitions to YES. If the indicator continues to display NO, refer to the Inspection/Maintenance (I/M) System DTC Table to identify the DTCs that did not run. Follow the Conditions for Running the DTC in order to set the EVAP I/M System Status indicator
⇒ If any of the I/M System Status indicators display NO, refer to the Inspection/Maintenance (I/M) System DTC Table for the indicator which did not display YES. The I/M System DTC Table identifies the DTCs associated with each I/M System Status Indicator. Follow the Conditions for Running the DTC in order to set the associated status indicator.

 

And you have a 195 degree thermostat installed correct?

 

Thanks Les you have always been good at simplifying things oh and don't worry when I get my service manual hopefully I will be able to simplify those steps to where a DIY mech can understand them. And someone with a $2000.00 or more code reader so I can use most of what you put down.Those of us with $400.00 code readers don't have that luxury.OH yes and the GM dealer that said they would fix me up for $150.00 fixed a fuse eng 1 10 amp and told me maybe there was a leak and they would have to smoke it more money and drop the gas tank more money so far with gm dealership that told me $150.00 out the door evap fixed out the door has cost $220.00 and by looks of thing,s another $300.00 and then just maybe they can get me out the door for just around $500.00 thanks but no thanks but again thanks for all your help on the matter.