Sounds like you might have a problem with your EVAP system, but like Here2HelpYou said it's best to get a second opinion from an experienced mechanic with good diagnosing equipment before you take a wrench to your hood. I knew an experienced truck mechanic that worked for https://www.towtrucknewmarket.com/ and I wish he was here to give his 2 cents because he drove a 2001 Chevy Silverado for 15 years before he moved to Waco. Anyway, I digress. To conclude, yes, a second opinion from a reputable mechanic is always wise.
This may be an issue that’s easily solved but requires a diagnostic scanner that’s more advanced than most cheaper models like found at homes or most auto parts store chains. Ask friends/family who the most knowledgeable/reasonable mechanic that they know is- preferably one with training and dealership/high end shop experience- they’ll be more likely to have the better diagnostic equipment. If I took the context of the question wrong and you mean the time it takes for the evaporation system to cycle- that varies by vehicle but usually isn’t a long time- call your local dealer depending on the manufacturer of the vehicle and ask them- ask for the parts department, also try service if they don’t help. Many will allow you to ask a technician a question if you ask the right way...good luck
SOURCE: serpentine belt replacement 1994 chevt silverado 5.7 lt
call your local autozone and the will tell you over the phone or fax you a copy
SOURCE: Need engine harness wiring diagram for 2001 chevy truck V8
The Best diagram you can get is at alldatadiy.com it has the sections and locations and color of wires with pictures.
SOURCE: knock sensor on 2001 chevy silverado
on the 4.3l version the knock sensor is on the back left side of the engine right by the bell housing. on the bigger engines they are below the intake manifold in the engine valley
SOURCE: 2001 chevy s-10 pickup again. Not Ready codes. This time I am
you will need to drive approx 500 miles it will eliminate the not ready but will bring back the codes
Testimonial: "Thanks. I thought I would just need to drive it a few miles (two or three trips). I would have been really frustrated that it did not fix the problem."
1 Ensure that fuel filler cap is fully closed (minimum three clicks).
2 Fuel level > 30% and < 85%.
3 Using WDS scanner perform ECM DTC Clear (even if no DTCs are flagged).
4 Drive vehicle for a minimum of 2 minutes, and until engine is at normal operating temperature.
5 Using WDS, ensure that the EVAP Canister Purge Valve is operating by observing "PURGE VAPOR MANAGEMENT VALVE - DUTY CYCLE". If the valve is not
active, ECM adaptions have not been learned. Conduct a "green ECM" Drive Cycle as described in Technical Service Bulletin.
6 Drive vehicle to the road where the EVAP System Drive Cycle will be conducted. Stop vehicle and switch OFF the ignition. Leave ignition OFF for 30 seconds,
then restart the engine.
7 Accelerate briskly to 80 km/h (50 mph) ensuring that the engine speed reaches a minimum of 3500 rpm for a minimum of 5 seconds.
8 (0.040 inch EVAP Test) View WDS "PURGE VAPOR MANAGEMENT VALVE - DUTY CYCLE", "CANISTER CLOSE VALVE - VAPOR RECOVERY SYSTEM", and
FUEL TANK PRESSURE - VAPOR RECOVERY SYSTEM". Avoiding high engine loads, drive the vehicle steadily between 65 km/h (40 mph) and 100 km/h (60
mph). Avoid driving conditions that will produce excessive fuel movement. WDS should give an indication that the test is active (it may take up to 30 minutes
before the test will initialize). When the test has initialized (EVAP Canister Close Valve CLOSED), it will take approximately 90 seconds for the test to complete.
9 (0.020 inch EVAP Test) Continue driving vehicle as explained in Step 8 for an additional 10 minutes.
10 Gently coast the vehicle to a stop. Allow the engine to idle for 2 minutes and view WDS "PURGE VAPOR MANAGEMENT VALVE - DUTY CYCLE", "CANISTER
CLOSE VALVE - VAPOR RECOVERY SYSTEM", and FUEL TANK PRESSURE - VAPOR RECOVERY SYSTEM". WDS should give an indication that the test is
active. When the test has initialized (EVAP Canister Close Valve CLOSED), it will take approximately 90 seconds for the test to complete.
11 If the 0.020 inch EVAP Test is not activated, the purge system vapor concentration may be too great. To reduce the vapor concentration proceed as follows:
12 Drive the vehicle for an additional 30 minutes avoiding driving conditions that will produce excessive fuel movement. Repeat Step 10. If the 0.020 inch EVAP
Test is still not activated, repeat the Drive Cycle from Step 6.
13 Using WDS, check for and clear flagged DTCs
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Usually answered in minutes!
My apologies, I meant to close with the fact that my 99, 05, & 06 GM Trucks cycled the EVAP system within 15-20 minutes, certainly 30 is enough time to know for your Truck.
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