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Hi everyone, just joined the forum -- looking forward to it!
I just received a 2016 C7 Z51 from VROOM - I'll discuss my opinions about VROOM another time!
I took my car in this morning for an inspection. I was told they could not do the emissions test because more then likely VROOM put in a new battery (not a bad thing) and I have to drive the car for 150-200 miles before the inspection system will allow them to test the emissions -- has anyone ever heard of this???
Your vehicle's on board computer system is not ready to tested.
Please see attachment below. I appreciate the help!!!
Welcome to the forums, nice ride! You posted in introductions, moved you here for your Tech Questions.. I am not sure if it's the same but I had a car fail before because I just put a new battery in it. After new battery car needed to be driven a while to reset and put data up again... so computer can be tested successfully
Normal with most vehicles. The emissions system parameters show NOT READY when you plug in a code scanner to the ODBII port under the dash. It takes several ignition cycles and driving to get them to OK or FAULT. Drive the car for about a week and you should be good. Any of the auto parts stores can plug in a scanner and check for you if you don't have a scanner.
1. Start with a vehicle where the engine has cooled all the way down over night.
2. Fuel level between 1/4 & 3/4 full
3. Drive between 20 & 30 MPH for 22 minutes, allowing speed to vary.
4. Stop and idle for 40 seconds, gradually accelerate to 55 MPH.
5. Maintain 55 MPH for 4 minutes using steady throttle input.
6. Stop and idle for 30 seconds, then accelerate to 30 MPH.
7. Maintain 30 MPH for 12 minutes.
8. Repeat steps 5 & 6 four times
Now, get tested.
That's what I found in my cheat sheet notes!
Car needs to be driven to get it to remember itself!
Will this also happen if the car is stored and on a tender for 3-4 months? For example can you take it out of storage and have an emissions test done right away? Or is it same situation as above? My plate registration is due 3/15/2022 and I need an emissions test.
As long as there is voltage storage will not create that problem.. I did my first last year and mine is in storage for the long Winter as well.. no problems
Will this also happen if the car is stored and on a tender for 3-4 months? For example can you take it out of storage and have an emissions test done right away? Or is it same situation as above? My plate registration is due 3/15/2022 and I need an emissions test.
Nope, no worries. Got to zero the electronics out by no power and then that needs to be for 15 or 20 to make sure the electronics clears it's memories.
As long as there is voltage storage will not create that problem.. I did my first last year and mine is in storage for the long Winter as well.. no problems
Originally Posted by eboggs_jkvl
Nope, no worries. Got to zero the electronics out by no power and then that needs to be for 15 or 20 to make sure the electronics clears it's memories.
I've been in electronics for over 55 years. The software engineers can make my hardware do any test that I need right now. There is no way that GM and the rest of the manufactures don't have test software that forces the cars computer to run these tests immediately. You don't think that they drive each car around for a couple weeks to test and set the monitors do you?
I imagine one of the last steps durning manufacturing a new car is to run the emissions tests. Common sense says they would have to verify everything passes because the dealer just slaps a sticker on the car when it rolls off the transport. EPA would never allow a dealer to do this if there was a chance that the car would fail emissions.
And remember, a lot of cars have the battery disconnected when they are shipped. There has to be a paper trail back to prove the car can and has passed emissions.
I wish some savey software engineer would crack the code or leak the code so some company could produce a scanner that would 'FORCE' the computer to test RIGHT NOW. This would not break any laws and would solve a lot of problems.
Such programs do exist.
Several years ago, here in new Jersey, I was unable to pass inspection in my custom tuned Mustang Cobra. Each time i tried, at 3 different inspection stations, it came up "not ready", "not seen" or some similar phrase. Each time I was told to just drive it around for a while and come back. I drove 50 miles with same failure, then 100 miles still "not ready".
After 3 tries i went to my tuner and he told me he had been able to obtain a program to satisfy all the parameters for NJ DMV. Implying that it was not a cheap or easy program to obtain.
So he rode along beside me with his laptop plugged into the OBD port and instructed me on what speeds to drive and for how long and once those parameters showed green on his laptop, he gave me the next set of parameters (speed and duration) and so on until all 6 or 7 parameters showed green. It took about 20 minutes as I recall and i went from his shop direct to inspection station and passed without issue. On the fourth try!
best recollection: the speeds varied between 25 and 45 mph and durations from 2 to 10 minutes.
I had that car for 11 years and never had that problem before or after.
Last edited by blueray16; Feb 12, 2022 at 10:48 AM.
The EVAP monitor is the hardest one to show ready…with a higher level scan tool one can do a “service bay test” which takes about 5 minutes…if not there are a few parameters that have to be adhered to…level of gas in the tank, high or low ambient temps will not make it run, ECT…every time the battery is disconnected all the monitors will have to be run and if some DTC’s are current or pending they will not run also !!
I've been in electronics for over 55 years. The software engineers can make my hardware do any test that I need right now. There is no way that GM and the rest of the manufactures don't have test software that forces the cars computer to run these tests immediately. You don't think that they drive each car around for a couple weeks to test and set the monitors do you?
I imagine one of the last steps durning manufacturing a new car is to run the emissions tests. Common sense says they would have to verify everything passes because the dealer just slaps a sticker on the car when it rolls off the transport. EPA would never allow a dealer to do this if there was a chance that the car would fail emissions.
And remember, a lot of cars have the battery disconnected when they are shipped. There has to be a paper trail back to prove the car can and has passed emissions.
I wish some savey software engineer would crack the code or leak the code so some company could produce a scanner that would 'FORCE' the computer to test RIGHT NOW. This would not break any laws and would solve a lot of problems.
A “service bay test” on a higher level scan tool only requires 2 or 3 parameters for the test to run and “forces” the test to run…the scan tools to do this have been around for 20 years !!
Can't Inspect My C7
