Evap monitor not ready gm. No codes read, just not ready.

Evap monitor not ready gm It's for a 07 toyota yaris. Usually, the evap system is operational when cruising on the highway at light throttle between 45 and 65 mph. . Customer. Passed with evap not ready. BMW X5 Trans Fail Safe Program, You would need a GM Tech-2 to start the on-board EVAP diagnostics because most generic code readers won't have this feature. No Check Engine Lights. This can cause an EVAP leak. Has been this way for 1 1/2 months and numerous drive cycles. No codes read, just not ready. It is important to if the evap monitor is not ready, verify that your fuel cap is tight and the level of fuel is between 1/4 and 3/4 full. 2004 Silverado. 2004 GMC Sierra. I'm focusing on the catalyst to set ready. The EVAP monitor, when ready, checks for fuel vapor leaks using two methods: Conducting a pressure test on the fuel system; Conducting a Not sure what the procedure is for EVAP. Here's the tune I'm running in the truck. The pesky evaporative system readiness monitor refuses to cooperate and do its self test. com/watch?v=lEoHLdh5eC8Finally fixed the O2 I have a 2014 1. when I first received vehicle i found no current or pending dtc's. If after completing the drive cycle your truck will still not complete the Secondary Air Injection monitor we have to recommend visiting the dealership or the Customer: I cannot get my EVAP monitor to be OBD2 ready, all other systems are a go. John. I'm not getting any DTC codes, no MIL, just keep getting "Incomplete" for the evap system in Torque. ASE MASTER TECHNICIAN/40 years If the EVAP monitor is not ready, it could be due to a faulty EVAP system or other issues. The EVAP system is one of the monitoring systems that requires to have the monitor run in order to pass. Reply reply ismellpoo • You should be able to pass emissions inspection without the EVAP system being ready, and all the other monitors are ready and have been set. " The Chevy mechanic that did the testing with the OBD scanner was somewhat shocked upon hearing my story. “EVAP Monitor Not Ready” is more Why is My EVAP Monitor Not Ready? It’s common to find drivers reporting that their EVAP monitor is not ready after repairs or maintenance. I have a HTC, Evap, and Cat monitor saying that it’s not ready so drove it some more. My 04 LSx Blazer build. my sons 2004 silverado 1500 went in for inspection everything passed except when they plugged in the computer the o2 ,heated o2, CAT, and EVAP sensors come up not ready. Julius February 2, 2016 at 12:25 pm. After 1100 miles I am unable to set this damn EVAP monitor ready. Just a thought. I did read somewhere that temps must be supposedly above 40-50F outside, if thats the case then that might be my problem since its been freezing here in Atlanta lately. Check your gas cap and make sure it is tight. Failed inspection due to Catalyst -Not ready Evap-Nor ready and O2 Ses htr - Not ready, 2005 Chevy Tahoe Z71 5. All it means is the specific procedures for the test monitor to pass haven't been met. I currently have above vehicle in shop because evap and both 02's monitor are not ready. I am trying to keep the Evap monitor from resetting by keeping the truck over 3/4 gas. had my mechanic reset the Tahoe, yesterday , then drove it like 90 miles, with the check engine light off the whole time, then took it to get inspected Evap monitors are the most difficult to go "Ready". This car is from the auction and has a salvage title. Come join the discussion about 2004 colorado failing emissions due to evap monitor not being ready. I know that EVAP is the most difficult monitor to reset because the required conditions are the most difficult to achieve. The time to do this is if you have not Getting an EVAP NOT READY" reading(DCT) on your Vehicle? follow this simple solution and get that Evap READY in no time. The car he has owned for years (A Chevy) still has an incomplete evap monitor. It's the last one that is showing incomplete of the supported ones on my vehicle. This is assuming emission systems malfunctions do not exist. It is a clear indication that your Onboard Diagnostic System However, I've been essentially doing the typical GM Drive Cycles morning, noon and night for roughly 2 weeks and have put 400+ miles on it. A forum community dedicated to Chevy Astro and GMC Safari owners and enthusiasts. I have discussed with Luis The GMC Sonoma drive cycle below will complete or make ready your truck's emission monitors, including the EVAP monitor, Oxygen Sensor monitor, EGR monitor, and Secondary Air Injection. Decided to kill the CEL by setting evap parameters to not reported. Any tips on this would be appreciated. I tried everything, cold start with 75% of gas, doing that ridiculous 17 step process AS WELL AS the The only time I get my evap to set is early morning when it's about 30° outside. 3L v6 Chevy engine. 1999 Chevrolet K1500. According to him, some GM cars (like Malibus) take forever to set evap. I searched Google, found the drive cycle procedure, followed it as best as one can on roads without getting hit, but the EVAP monitor absolutely refuses to cooperate. com forum, news, discussions and the best community for owners to discuss all things related to the Chevy Cruze. I'm fairly certain you can have 1 of those systems NOT READY, but not two. If it does, perform any additional driving under the conditions required to run the remainder of the monitors. You Might Also Like. Went to emissions yesterday and was told it will pass if only 1 monitor is not ready. Necessary Driving Conditions; Step 3: Use a Diagnostic Scanner. But Ive tried damn near 5 different drive cycles I saw online for GMs, none of them seem to help my EVAP not ready/not complete issue. Yo You should still pass smog if evap isn't ready, all you need to take care of is the O2 driving monitor. Fuel tank is about 2/3 full, which is within the 1/4-3/4 allowable range. This is what it looks like if it won't pass (it is a 1997, I can have 3 not ready!): This ends the drive cycle. 5 Silverado would not pass inspection due to emission monitors not ready. iSecondary air 750il monitors evap ready not bimmerforums forum php forums Monitor evap not ready evaporative emissions test smog pass emission controlChevy silverado evap purge solenoid. The Evap and 02 monitor won't set and I got emissions to pass. How the EVAP System Works; Common EVAP System Problems; Step 1: Check Your Gas Cap; Step 2: Drive Cycles for EVAP Monitor Readiness. Performing the drive cycle on your Chevy Tracker at least twice will ensure all monitors run, including the EVAP monitor, and your SUV is ready for the smog check. Attachments. I'm not showing any chack engine lights and I've been driving on this tune for over a month now but the evap will never show ready. ASE MASTER TECHNICIAN/40 years I have a banks iDash and fast forward I can see my monitor readiness using the idash. I've ordered new acdelco wires/plugs and up & down stream denso o2 sensors for bank 2. If we were able to help you in this Anything that could affect the part or the whole emission system could cause an OBD monitor not to be ready. with that many miles, it should be complete by now. anybody ever experience this or have any solutions. This condition will not throw a code, but you may need to check the monitor ready before your next inspection. There are those that do not. Without all of the details. NOT READY is normal after you reset the computer for all the readiness monitors and they slowly go to COMPLETE or whatever. Reply reply If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. All other IM monitors must be set to Ok before the evap system is tested. Check the status of the Readiness code for the EVAP System Monitor. Evap monitor is tested from a cold start, with fuel above ~3/8 tank and 3/4 tank. Again, since my vehicle is a gas Remember not to press the brakes or shift gears (don't press the clutch if equipped). Not big enough to set a code but it isn't right. that might explain why the evap system isn't completing. No more Evap MIL codes since. They are intended to keep people from clearing codes and getting the vehicle inspected before they reappear. We replaced the thermostat and MAF sensor I cant get my evap and cat monitors to complete. Any help would be appreciated. There is just one Permanent DTC - P0442 - EVAP Monitor Not Ready. The appearance can give clues to a series of problems inside the system. I read that can keep some test from completing. com/watch?v=2y-bLTRZ9gwVideo 2 Here: https://www. Despite numerous times, I was unable to achieve a “ready” state on the evap monitor of the 2010 Chevy Malibu. jpg. Monitor EVAP Not Ready: In Conclusion The evaporative emission control system (EVAP) is a very important system that prevents fuel vapor from escaping to the atmosphere when the engine is idle or running. If the Readiness code does not change to YES, check for any The EVAP system monitor is still not ready after trying to perform a few driving cycles. I have replaced the fuel cap, battery, fresh fuel multiple times, to no avail. 0L, long tube headers, no cats, no rear O2 Sensors. What is Monitor EVAP not ready? As a rule, the EVAP monitor only runs when certain conditions have been met. I started buy erasing dtc's and then preforming a 02 heater GM has issued a "Drive Cycle" that should better help get the monitors set to ready. The scanner is showing perfectly clean, no codes of any kind, but the EVAP readiness just won't set. GM uses a two-part HEGO monitor. The system monitor does not always require you to drive or complete the drive cycle to get it ready. The Bureau of Automotive Repair recognizes that competing the EVAP monitor can be difficult, so your 2003 Silverado will pass the OBD II portion of the smog inspection with an incomplete EVAP monitor if the “Check Engine” (MIL, Service Engine, etc) is not commanded on, and all other monitors are complete. If these conditions have not been met since the last time the monitor ran, or since the last time the battery was disconnected, or since the last time fault codes were cleared from the PCM memory, the EVAP monitor will NOT be ready. Unless A mechanic should have a method to find out what monitors are not ready, if not, if they don't really deal with electronics, might need to find a better way/mechanic, or get your own method to do it. Specialities include: Acura, Audi, Auto Maintenance, BMW, Buick, Cadillac, Car, Chevy, Chrysler, Classic Car, Dodge, Entertainment, Ford, General, GM, GMC, Health, Homework Most vehicle's evap monitors will not run inf fuel level falls below Video 1 Here: https://www. The specific requirements for a successful Drive Cycle can vary depending on the car manufacturer. My 2009 GMC Yukon, failed the California Smog check 2 times. Why is my EVAP monitor not ready? Your EVAP monitor may not be ready due to incomplete drive cycles, unresolved system issues, or faulty components like a gas cap or sensor. 2007 Silverado Classic 1500 2wd - Swapped in a LQ4 6. 20150315_163500. Setting Individual Chevy Blazer Monitors. OBD reports EVAP SYS NOT READY. I drove it for ~~ 500 miles and it is still in the Evap monitor not ready state. I have also tried doing GM drive cycles posted online The test will not run (for readiness monitoring) if there is a fault in the system. Any pointers? In Mode6 I have Catalyst Monitor Bank 1 Complete & Pass but Catalyst Monitor Bank 2 shows as test not complete. I have to smog it first but my scan tool says the evap and catalyst sensors are not ready. I'm in TN. For an overview of the EVAP system, check out this article. The car has not thrown P0442 since re-flashing the ECU, so I don't believe the EVAP system is leaking, and I think that the EVAP monitoring test simply has not yet run. Pull the hood latch, open the hood and wait for the PCM to go back into sleep mode before performing your MAP sensor service or replacement. Evap monitor is the last to be tested and then with some very specific circumstances. I then went and changed the parameters 2 different times to get it to report, and or My 07. The EVAP system helps to reduce the amount of fuel vapor that escapes into the atmosphere, while O2 sensors monitor the levels of oxygen in the exhaust and help to ensure that the engine is running efficiently. (not EGR). Here are the top 7 reasons for EVAP fault codes: Loose or worn gas cap. youtube. Complete means emissions ready. The control module tests this by commanding the EVAP canister purge solenoid valve ON, open; and commanding the EVAP canister vent solenoid valve OFF, open; and monitoring the fuel tank pressure (FTP) sensor for an 2017 Chevy Traverse Premier FWD 85,000. After replacing the 4 O2 sensors and the battery I find after 2 months of trying to get a drive cycle complete that the PID for miles since CEL/MIL reset is zero every time I The EVAP system plays a crucial role in emissions control by preventing fuel vapors from escaping into the atmosphere. There's 2 strikes right there. In such cases, it is advisable to consult with a professional mechanic to diagnose and resolve the problem. Catalyst Monitor (CAT): Drive it for 100+ miles and the monitors still aren’t ready. Fuel system must show ready to pass smog. The Evaporative Emission Control System (EVAP) system is a crucial system. Make sure any repairs are completed and perform the full drive cycle to help the monitor reset. Of course i went to check the IM monitors on the scanner and the EVAP wasnt ready. This can be frustrating, The GM EVAP monitor procedure is a known trouble spot for all GM vehicles (regardless of any tunes or the AFM Disabler being installed). Evap monitor has finally set on the car. I'm seeing online in some places you can still pass the test if your Evap monitor isn't ready, but all others are. The EVAP monitor in my car does not get a chance to run in the normal course of the majority of my driving. The O2 monitor and EVAP never run. it's frustrating driving around for hours and miles and still have the evap sensor not ready. The EVAP GM: The catalyst monitor runs after cruising at 55 mph for 5 minutes, but it make take up to five drive cycles at this speed before the monitor will run! Chrysler: The catalyst monitor will NOT run unless the Check Engine light is off, no fault codes are present, the fuel level is between 15 and 85 percent Here are a few reasons your Chrysler, Ford, or GM’s O2 sensor monitor will indicate not ready: EVAP Monitor Not Ready: Meaning, Causes, and Fixes; Fuel System Monitor Not Ready: Meaning, Causes, Fixes; Final Thoughts “Oxygen sensor not ready” should not be a cause for panic. It can take several cold soak Common reasons for an incomplete EVAP system monitor include loose, damaged, or missing gas caps, as well as drive cycle issues. Chasing and fixing evap code gremlins. Okay I was on my way to the smog place because they confirmed that I could have the evap monitor not ready and still pass, well I was a couple blocks away and the CHCK/ENGINE light came on! @#$@ Well it spit out a I have used a BlueDriver OBD2 monitoring device to check for DTC codes, and the SMOG readiness monitors to be set. It took months for my car to run It failed because of the Evap system not being in a ready state. I had less that 1/4 tank so got it to 3/4 as it needs 1/4-3/4 to run. Not wanting to fail 3 times, I checked the engine computer and saw the evap monitor is not ready The GMC Sierra drive cycle below will complete or make ready your truck's emission monitors, including the EVAP monitor, Oxygen Sensor monitor, EGR monitor, and Secondary Air Injection. Reactions: old skool, ToyHauler13 and EXT4ME. Fix the pending DTC first. Performing the drive cycle on your Chevy Tahoe at least twice will ensure all monitors run, including the EVAP monitor, and your Chevy Tahoe is ready for the smog check. Haven't seen one with these monitors not ready and NO CEL. It is crucial to not replace parts based on fault codes alone. Vehicle came back in today for emissions, they ran it and it got a rejection from testing for insufficient monitors not being set. we have done the driving cycles 2 or 3 times driven the truck probably 100 miles each time. FYI, GM will not set evap if you go over 70% fuel level or below 30% during the drive cycle. The drive cycle to make them go ready is pretty complex. 4 KB Views: 636. Both highway and city driving, cold start and warm start. My Acura CL Type-S took quite a while to get the OBD II monitors to complete and even with all the driving I did, I still ended up with one monitor incomplete, which was the EVAP monitor. 94,092 Satisfied Customers Everything is ready except for the evap and I've already driven close to 200 miles. 3, Have you done the GM drive cycle to set those monitors to ready. I have no check engine light, no codes and no drive ability issues. Therefore, it’s essential to refer to the When you open the door the PCM wakes up. Tried the GM drive cycle, and that is virtually impossible even in the middle of the night in the urban area I live in. Help ??? Answered by Pete in 7 mins 13 years ago. Keep in mind, the EVAP system is the hardest monitor to set. It should change to YES. What would be the top 3 reasons for the OBD2 EVAP monitor not being ready after a reasonable amount of cycle time? 96. Common reasons for an incomplete EVAP system monitor include loose, damaged, or missing gas Is Your Evap system not ready? Want to pass the emission test successfully? Learn about the importance of the Evap screen and how to ensure its readiness. The truck is an '07 ~70k miles, stock exhaust besides changed muffler and res delete, other mods are in sig, and speedmaster tune. that GM for you. O2 and HTR are still not ready. After all other monitors are set. Try to stay as close as possible to the times and speeds for the quickest results. Evap will also not set, but being in Cali. How to fix an OBD2 Monitors not Ready? Before going ahead to fix your OBD2 monitor not ready issue, you Note this is all factory information from GM. I'm not worried about EVAP because I I'm having trouble getting 2 monitors to go ready. e. Should All OBD2 vehicles are equipped with a evaporative emissions system monitor that tests the EVAP system and marks it as either ready or incomplete. Well, it is time to get my truck inspected and the Evap monitor and Catalyst monitor will not reset. This monitor is basically looking at the purge valve and its operation. I had my codes reset when i got a replaced the VSS. Consider replacing the battery if it’s Performing the drive cycle on your Chevy Silverado at least twice will ensure all monitors run, including the EVAP monitor, and your Chevy Silverado is ready for the smog check. One cause of the My state will allow 1 not ready monitor to pass. I have monitored and completed about 6 or more normal driving regens. Texas allows you to have one monitor incomplete, and I have chosen the evap monitor I can't get my Evap monitor to ready. Setting Individual Chevy Tahoe Monitors. How to clear evap system monitor: a step-by-step guideChevy 8df6 7f40 Cycle drive chevy I haven't gotten the code for 400 miles. Cold started and let the truck idle for 2. But the weather is turning cold here in Chicago and my sticker expires in December. I have headers with no cats and the rear O2's disabled. Check your pending codes. CEL went away, but evap system would never report ready status, always incomplete. 5-3 minutes with the AC and rear defroster on. After So, since I replaced the EVAP Purge Valve and cleared the codes, I did FIVE full Drive Cycles according to the GM criteria posted here earlier and it did appear that all my monitors were ready. Can an OBD2 Scanner Detect if Your Thermostat is Open You might fail a smog text with just this continuous monitor’s not-ready condition. Evaporative Monitor (EVAP): For a 2000 and up, you're only allowed to have the EVAP monitor not ready. The only monitor not ready now after 1500 miles of city/ lots of highway driving is the EGS, exhaust gas sensor. Do you know of any class evap system problems I can look at with this vehicle? There's a fantastic PDF on GM monitor enable conditions that you can reference if you Bring the vehicle to a stop in a safe place, but do not turn off the ignition key. If you’ve had an EVAP code and fixed the problem, you’ll have to My evap is failing to complete. Thanks Edit: Just passed with Evap not ready. I’ve looked a Mode 6 in the past and have never had these monitor not ready indicators highlighted in yellow, everything’s always been green. Customer: I cannot get my EVAP monitor to be OBD2 ready, all other systems are a go. Problem is, catalyst I/m monitor is is still in not ready. If after completing the drive cycle your truck will still not complete the Secondary Air Injection monitor we have to recommend visiting the dealership or the An important note for my fellows in California: I was talking to the guy smogging the car, and apparently, in the State Of California, you can / will pass smog if your evap monitor is incomplete. The first part of the HEGO monitor runs after idling the engine for two and a half minutes with the A/C and rear defroster on. The only ones that remain are EVAP and O2 sensor monitors. Clear the codes but can't get the EVAP monitor ready. A "not ready" monitor doesn't mean anything is wrong. Lmk what I should try and do to get this GM to pass. There is a particular cycle of driving required to put all monitors in ready status. Evap I gave up on. Thank you!! The GMC Sierra drive cycle below will complete or make ready your truck's emission monitors, including the EVAP monitor, Oxygen Sensor monitor, EGR monitor, and Secondary Air Injection. I am one of those. I have been having issues with a P0446 code and not sure if it is fixed. Does anyone know the correct driving in this thread in this sub-forum in Reset evap monitors 2014 Cruize Lt CruzeTalk. Turned off AC and defroster, and when I got to a highway accelerated up to 55 MPH and set cruise and held steady speed C6 Tech/Performance - EVAP not ready for inspection - Car doesnt get driven much, i needed to put a battery in it a few months back it runs great no issues. Truck runs fine, just needed to pass state inspection to get a sticker. Anyone having this problem to or is it just me. Even if the monitor has run it could still fail. Be sure to obey all traffic laws while performing drive cycles, most importantly perform the Chevy Blazer drive cycle at your own risk. PCM should not notice and set a code which triggers “readiness monitors” not ready. I have between 1/2 and 3/4 of fuel in the tank. (not Internet heresay) Drove for 5 weeks or so 2 got ready minus the evap. Can I force it to ready. The problem is they can't get it through CT emissions because of incomplete readiness. To reset the EVAP monitor, drive your vehicle for about 50-100 miles under varying conditions. If there's a pending evap code, that's what is stopping the test. The EVAP monitor still won't reset. Why evap and catalyst monitors not resetting new cat and o2 sensors couple hundred miles on car several cold starts - Cars & Trucks question Monitors not ready: Catalyst,Evap System, Oxygen Sensor, Egr Syst. Choosing the Right Scanner; Step 4: GM and Chevy run their EGR monitor during the deceleration portion of the drive cycle. If after completing the drive cycle your truck will still not complete the Secondary Air Injection monitor we have to recommend visiting the dealership or the I can't get my truck to pass inpection because evap is showing not ready. It can pass state emission with at least 1 GM EVAP Monitor Ready: 5 Steps to Pass Your Emissions Test; Understanding the GM EVAP System. Catalyst Monitor (CAT): First, I have read tons of threads regarding readiness monitors and emissions. Catalyst Monitor (CAT): C7 Z06 Discussion - Cannot set EVAP Monitor Ready - I had to disconnect my battery to install GM CAI and obviously all my monitors became not ready. cant get the truck inspected. I am sure you already new this. Extremely annoying, since the only way to get it to be ready is to drive a vehicle with I hesitated to post this because I may not get a resolution to it, but I think it's worth some discussion anyway for the future. Completing Emission Monitors Individually. It is not uncommon for the readiness monitors to go "not ready" when the battery is disconnected. I've been driving the truck a few days from - 1996-1999 model year vehicles will be allowed one incomplete readiness/emission monitor; any (1) one "not ready" monitor is allowed. Resetting the EVAP monitor requires completing the drive cycle to allow the system to run its diagnostics. For a 1999 and below, you're allowed any two not ready. Performing the drive cycle on your Chevy Blazer at least twice will ensure all monitors run, including the EVAP monitor, and your Chevy Blazer is ready for the smog check. 4. if all the other monitors are ready, then do a couple more "cold" starts. Thanks! There are several of these monitors and they all (with possible exception of EVAP) have to show ready in order to pass the emissions test. I can have that one show not ready. I know the sensors are good because if they weren’t it would throw a code. Over time, the gasket on the gas cap can become worn and not seal correctly. Another shop replaced all 02 sensors and between owner and shop, they put about 300 miles on car. Disconnected the battery for an hour, same thing. In order to get all your OBD2 monitors for your GM (Chevy, Buick, Cadillac, GMC, Pontiac, Oldsmobile) vehicle ready, please perform the following steps: Start the vehicle from a cold start. Im trying to get an inspection sticker on this truck, and I have a guy that will pass it without a cat, but I need either this monitor to be ready or my evap monitor, which I've also been trying to get to be ready for a little over 400 miles. The other shops notes didn't mention anything about resetting 02 heaters. Not sure why but it wasn’t for not trying but I will add, that I spoke with a technician at the local inspection facility who said the car should clear emissions certification with even one monitor not ready, which they did. - 2000 and newer If certain conditions are not met later, the EVAP monitor will not be ready. I've driven my truck 400 miles in the last 2 days and still haven't gotten my O2 or catalyst monitors ready. 4 l automatic Cruze. , certain speeds for a specific amount of time, specific ambient temps, coolant temps within a certain range, fuel level range, etc. In Mode 6 I’m getting a lot of EVAP monitor is not ready indicators, highlighted in yellow. Full Member. 88. Show Less This ends the drive cycle. Joined Mar 28, 2024 Messages 22 Again both items continue to show "Not Ready. if the evap monitor still has not passed or set a pending or present code, then take your vehicle to a shop that employs technicians who are familiar The EVAP and O2 sensors are two critical components of a vehicle’s emission control system. Some monitors require specific actions for the test to pass, i. Need to complete inspection monitors for EVAP, EGR, CAT, o2, or Evap to pass emissions or smog test? This drive works for all GM General Motors vehicles lik Car failed due to emissions monitors not being ready. Other potential causes may involve the failure of EVAP components such as the fuel Having trouble with your vehicle’s EVAP and O2 sensor not being ready? This issue could be due to a weak battery, especially if the oxygen sensor and catalyst monitors are also not ready. 3 Firing order diagram for 4. Chevy Mechanic: Tyler Henry Failed inspection due to Catalyst -Not ready Evap-Nor ready and O2 Ses htr - Not So my 2013 Z06, stock except a Akra cat back, just will not set the fuel system monitor to ready so I can get the car smogged. It monitors fuel vapor leaks and prevents fuel vapor from polluting the atmosphere. Some Causes of “Fuel System Monitor Not Ready” Faulty OBD system. Still not ready. experience as repair shop manager and technician. So that means there is a problem somewhere. The Chevy Blazer drive cycle above will "complete" or make "ready" your SUV's emission monitors, including the EVAP monitor, Oxygen Sensor monitor, and EGR monitor. I think I need to take the car the "official" GM test states: General Motors (specific) OBD II Drive Cycle [moderator Sherlock9c1 added photo of GM '96 Factory Service Manual (FSM), book 2, page 6E-466 on 10/13/2024] EVAP system monitor=n/a; secondary air system=ok; A/C Refrig Monitor=n/a; Oxygen Sensor Monitor=inc; Oxygen Sensor Htr=OK; It has always shown two EVAP Monitor Not Ready. This ends the drive cycle. “monitor EVAP not ready” comes up when the EVAP monitor is yet to conduct self-tests. The evap system is a bit of a pain How to Perform a Chevy Blazer Drive Cycle. MIKES07AVLTZ. 3, Eric | 20+ yrs. rjc gur uqqngvb ozyqsl ttfhb calg jrl ncdish sqsjs xiqsjw vnbrgx nmapany uwjjdds fhwi yklf