So i was getting the P0455 code. i swapped out the EVAP line as it clearly had a hole in it. New line installed, i cleared the code by accident. UGH! I was on 10-day extension temp inspection that has now expired as i just bought the Jeep and it needed a few things before bringing it to be inspected. Is there a way to get it to go through the cycles to reset the computer without having to drive it around with no inspection and risk a ticket? UGH. i am such an idiot. :/

 

I suppose you could lift it up on jack stands to simulate driving.

 

This was the first thing that crossed my mind, but wasn't really sure if that was particularly safe to do.

 

Are you just trying to test the EVAP? If so, I believe you can just start it and let it idle to temp a few times in the driveway and that will adequately test the EVAP.

If you are trying to get the vehicle ready for an emissions test, then I believe you are going to need to drive it. Each car is different on how many miles are required but I typically do about 50 miles after resetting a CEL before trying to pass an emissions test. It will come up as not ready if you don't put enough miles on it.

 

Technically both. Id like to see if the line replacement did fix the CEL coming on. BUT the car needs to be inspected as it just has the 10 day extension tag from when i got it registered that is now expired.

Dang it thats what i was afriad of. Maybe i can drive it on back roads where there arent many cops around to put some miles on it. thanks man

 

Good thread on what makes up a drive cycle: https://www.cherokeeforum.com/f2/wha...-cycle-246424/. If you didn't disconnect the battery, then the ECU should not have reset the ready flag. If you have a basic ODB reader, you shoudl be able to get the ready state for emissions. I don't recall what it is, but it should be in that thread.

 

now i am the one confused, why dont you just clear any codes with an OBD reader, drive it down to the station and get it checked ?

should not need 50 drives, will just use default map

 

I did clear the codes, that is the problem. I wont pass emissions until the computer resets by the car being driven somewhere between 50-100 miles. If i bring it in like this, it will get "rejected" because the computer is not re-set. At least, this is what i have been told from mutilple people and internet searches.

 

I have heard that too, but am personally dubious.

I have heard the PCM will "re-learn" for the first 50 key starts, but the default PCM map should pass an emissions inspection

If in any doubt, go for 50 mile drive, and drive it real hard (I did this yesterday, to see if I could clear some pinging, which it largely did)

and/or key start & stop the engine 50 times over a short period

Disclaimer; I could be wrong

 

haha yea I really dont want to get a ticket for the expired temp inspection cuz right now business is slow for me so my income is just cutting it. Dont want to have to throw a ticket in the mix. But i have been taking it down the road to 7-11 cuz it is low traffic and i rarely see any cops. I only have to cross one main road. Its only a couple miles from my house, but if i do it a couple times a day it should reset eventually. Of course now i have P0175 code coming up as well, so i cant pass inspection with that anyways, so i gotta figure that out.

 

Ferris Bueller comes to mind 😆

 

Hahahaha yea that wouldn't be good lol

 

It happens to the best of us...Years ago I had a Sebring Convertible that I replaced the battery about a week before it went for inspection... I didn't drive it until the wife took it in and... The tech quickly stopped the testing so it didn't show a fail for emissions...I never gave it a thought until it was over... Drove it around the next week and all was good... You'll need to drive it around under different conditions simply putting it on jackstands and revving it won't get it done...

 

Yea i have been taking it to the local 7-11 to get it driving. It now has the P0172 and P0175 codes, so, it cant pass inspection anyways so i'll put the miles on a little at a time while i try and pinpoint where the codes are originating from.

 

From the web:

"The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists the MAF or Front Heated Oxygen (O2) Sensor will need to be replaced."

Since you have no MAF, you can ignore that part. Double check the O2 sensor connections.