So, over the past week or so I did a timing chain cover that required me to disconnect the battery etc. I just took the truck in for inspection and after waiting what seemed like 3 hours and listening to the guys chat on the phone with Massachusetts Inspection Main Office....they come back out and asked "did you disconnect the battery when you were working on this?" I said yes.

The guy says "it's not ready to be inspected...drive it around for a few days and bring it back....the computer hasn't reset."

Now I got a nice big "R" sticker on the windshield. Any insight?

 

some vehicles reset in 20 miles some take 300 miles to reset. somebody on here probably knows the exact miles for a disco.

 

i have heard that one before. just drive it around like the man said. not much you can do really.

 

I'd be interested to know the technical details behind this one...not only the mileage for the disco but also what exactly they are talking about.

 

There is what is called a "drive cycle" for the ECU, normally it just takes the last 400 miles of your driving and averages out what is best for you over the last 400 miles.
So if you drive all city miles then it runs the engine manegment at optimal city "cycle"
Now drive the expressway for 500 miles and it will be set for expressway.
The ECU is a adaptive engine manegment system, all fuel injected cars have this.
All fuel injected cars also have a default setting so that when something is wrong and your check engine light is on then the engine runs at what the factory set it for as a default, that is why your MPG drops to nothing when your O2's go bad.
In the RAVE manual it tells you how to reset the ECU.
It consits of something like start when stone cold, drive at XXmph for X miles, then wide open throttle for X miles, stop, drive, stop, reverse, etc. and this will reset the daily drive cycle.
Find it in the RAVE, it may also explain it in the owners manual.
Everytime you drive your oldest trip is erased and the newest one takes its place, like caller ID.
Even if all you do is back it out of the garage it will still erase your oldest trip.

 

quickest fix: move to louisiana where they dont test emissions...

 

HAHA good tip.
Emission tests make me madder than a hunch-back at a limbo party.