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  • luvbeefcakes
    started a topic Emissions test not ready 01 Chevy Cavalier

    Emissions test not ready 01 Chevy Cavalier

    I have tried for two months to get my 01 chevy cavalier to pass an emmissions test. Every time it comes back OBD NOT READY. Specifically the Fuel Sys, Comp, and 02 sensor read NOT READY. I have driven the car about 50 miles today and tried the emmissions test twice, both with the same result. Every time I've tried the test it has been burning natural gas. There are no check engine lights on or anything abnormal, and the car runs perfectly fine in both natural gas and regular gas. Any ideas how I can get this car to pass an emissions test. It's obviously a problem with the car's self testing system.

  • niklan123
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Thank You so much. 2 emmission places didn't know about the fuse, 3 Chevy places didn't know, searched the web for 6 hour's, paid $19.00 on Ask.com to Chevy Master mechanic and his suggestion was to time my visit to emmissions so the CNG would run out and the Gas wpould start up. LOL What a long day but today because of this Forum everything went so smooth. Thank You to Everyone

    Leave a comment:


  • CNG Utah
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    I think on an 01 Cavalier it will actually say CNG on the fuse box. It's probably a good idea to turn off the car before pulling the fuse.

    Leave a comment:


  • freedml
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Take it in running on CNG, then pull the Alt Fuel fuse in the engine compartment and it will switch to gasoline.

    Leave a comment:


  • niklan123
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    I am new and I can not post a new thread and I need help. Please, Please. I have a 2001 Cavalier and went to Emmissions today and they have to test both Gasoline and on the CNG and it has to be right then and there. My car when it has CNG in it, runs on CNG and only after that is gone will it switch to Gasoline. Well I can't figure how to switch from CNG to gasoline and they don't know or care, and wont pass the car until I can show them how to do it. They wont let me come in on Gasoline and come back an hour later with CNG. Does anyone know how I can go to Emmissions and let them check the CNG and then know how I can make it run on Gasoline for there stupid test. It is so hot here in Arizona, and my wife spent 7 hours dealing with the most uncaring people in the world. Thank You so much for any help you can give.. Thank You Lanny

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  • nttrainer
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    To bypass the OBDII test and do the tailpipe sniff they need to put in an exception code. The code is 201 (two-zero-one). At least that is what Utah County uses. I'm not sure if it is the same in the other counties.
    Last edited by nttrainer; 11-15-2009, 10:48 AM.

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  • wacbass
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Thanks so much for posting about the exemption!!! I have been wrestling with my 2001 Cavalier since first of Oct. trying to get it to pass. I will let you know what my local Jiffy Lube says.

    Leave a comment:


  • kirkbenge
    replied
    2001 Chevy Cavalier Bi-fuel is on the EXEMPTION LIST! (in Utah)

    OK, so I'm due once again to register my vehicle, time to pass emissions testing. I took it to my local Jiffy Lube, after driving my usual complicated route (cold start, accelerating, holding 50 mph, then 55 mph, then coasting to 20 mph etc) and I told the tech NOT to turn off the engine, but he absolutely refused, so of course I failed; 5 codes not ready.
    I hooked up my OBDII scan tool, and drove the route again (I wanted to verify that everything was READY), but to my surprise, no matter how long I drove, I could not get the EVAP and CATALYST to be READY. I kept my scan tool plugged in for two full days of driving, and both codes NEVER went to a READY state. I was getting frustrated, thinking I wouldn't be able to pass emissions, so I decided to call the number for the health department listed on the I/M report.

    Guess what? The 2001 Chevy Cavalier Bi-fuel is on the EXEMPTION LIST! (in Salt Lake County)
    It is a known issue that the codes reset and are very difficult to pass. You only need to do the tail-pipe sniffer test. When you go to your local I/M shop, tell them you need the tail-pipe test, and have them call the state at 801-313-6720 (salt lake county) for verification. No need to go through all of the hassle of getting all of those codes set!

    I would assume that if this is a known issue, other states and counties have adopted similar exemption lists. I am in Salt Lake County.
    Last edited by kirkbenge; 09-01-2009, 10:36 AM.

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  • Bear95
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Hello,

    I have a Chevy Cavalier 2001 having the same problem now, wore is the fuse for the CNG. I can’t find it.
    They say a message comes up “COMP” How do we fix that so My car a pass Emissions.

    Thanks,

    Leave a comment:


  • nttrainer
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Originally posted by Highmarker View Post
    I had the same problem with my '01 Cavalier back in June. When you go for the emissions test, don't turn the car off. Just have it idling while you are waiting for them to do the test, then pull into the shop and tell the technician NOT to turn the car off. It worked for me.
    That seems to be a common issue with the '01 Cavalier - the sensors reset when the car is turned off. That is what the Air Quality tech found with my car. He was running a real-time sensor on the car while it was on the dyno and he said that the sensors would go back to not ready when the car was turned off. Probably a good thing to remember when you take the car in for emissions testing.

    Leave a comment:


  • nttrainer
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Kirk, I appreciate you sharing your experience. Sorry I got a little caught up in the hyperbole there.

    My safety/emissions mechanic had a route of mixed driving that included about 10 miles of steady-speed freeway driving and returning on surface streets. He "guaranteed" that it would reset all sensors - it didn't.
    I took the car to DMV's testing facility in Sandy (the buyer lived in SL County) and they ran it on their dyno for close to an hour and they said they were able to get the 02 and Catalyst to go ready but they would reset to not ready when the car was turned off. They only ran it on CNG.
    I took it to Bill Brown Chevy in Provo and they tinkered with it for a week and couldn't figure anything out. They only charged me a diagnostic fee because they were so frustrated with it and just wanted it out of the shop.
    We finally found the GM drive cycle and ran it through the cycle on both fuels and finally everything came ready. I have noticed this to be a particular problem with the '01 Cavaliers and to a lesser extent, the '02 Cavaliers. I haven't seen much of a problem with the '98-00 Cavaliers. No experience with '03 and newer.

    It's nice to hear the experiences others have had.

    Leave a comment:


  • Highmarker
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    I had the same problem with my '01 Cavalier back in June. When you go for the emissions test, don't turn the car off. Just have it idling while you are waiting for them to do the test, then pull into the shop and tell the technician NOT to turn the car off. It worked for me.

    Leave a comment:


  • kirkbenge
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    ... "You can drive all you want on CNG and some of the sensors (Evap Sys, Catalyst, O2 Sensor) won't go to ready until you drive on gasoline."

    I don't want to sound too critical, but this statement cannot be true. As I stated previously, my '01 cavalier Fuel Sys, Comp, and 02 sensor were NOT READY. I had been driving normally on CNG for several hundred miles prior to this experience, but the codes were NOT ready. I did not switch to gasoline, instead I drove the car at a steady speed (I actually drove about 10 minutes at exactly 50mph, and about ten more at 55 mph) on CNG. When I got back to the I/M shop, all the codes were ready. I know from personal experience that the codes can all be ready even if you are only on CNG.

    Something that I forgot to mention previously: When I returned to the shop after the drive, I did not shut off the car, but left it running until the tech checked it. My plan was that if it didn't work the second time, I would unplug the low pressure lock-off, run on gasoline for 20 minutes and come back later, but it never got to that, 'cause it worked even on CNG.

    KIRK

    Also, check out this post for what other people have said... http://cngchat.com/forum/showthread.php?t=2525&
    Last edited by kirkbenge; 12-18-2008, 01:04 PM.

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  • nttrainer
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    I don't know if all counties in Utah are requiring this but Utah County (where I live) is requiring that the emissions test be performed on BOTH fuels. They are also getting very picky about non-EPA approved systems.

    Leave a comment:


  • freedml
    replied
    Re: Emissions test not ready 01 Chevy Cavalier

    Ok, so a day or two of driving on each fuel should make it ready. In California they only test the fuel that the car is running on at the time of the test. Were they doing more extensive testing or does their computer only look at the gasoline computer? The original post doesn't say which state it's from.

    Leave a comment:

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