1997 XLS : 6 months ago, the battery got disconnected for an alternator replacement; over the weekend I get a vehicle inspection/emissions test. The MS fails to pass because the Catalytic converter, the Evaporator and the EGR valve register as not having completed a cycle.
Mostly I use the sport for the 20 mile interstate trip into work and back, and over 6 months that is not enough for the system to complete these 3 tests? What gives? All advice appreciated.
maybe you should try going to a different shop, they might be just trying to rip you off. It usually takes about around 100 miles in order to complete the tests after the battery has been disconnected. or maybe you might have a short somewhere in the electrical system because of poor installation of the alternator which might be resetting the system every time you turn of the car. not sure if thats really possible, i'm just guessing. any one else have any insight?
It usually takes about around 100 miles in order to complete the tests after the battery has been disconnected.
This is not true. Most monitors can be completed in a short 5 mile drive (or less if you know what you're doing). The problem with the 97's is that the monitors automatically reset (from complete to incomplete) once the key it turned to the off position. The only way around this is to drive the vehicle for several miles PRIOR to the smog check- then go directly to the test station and have them test it without turning the key to the off position. Of course it would be nice if you actually had an OBDII scan tool to make sure the monitors are completed before going to the smog station. If you don't have a scan too handy, 10 miles of driving (city and street combo) should be enough to complete the Cat, O2, and EGR monitors. EVAP is the most difficult almost imposs to complete. The 3 alone is all you'll need. Try to keep the throttle steady and use long series of closed throttle deceleration before finally hitting the brakes during the drive before the test is attempted. There's a TSB for this concern that will have the dealership complete the monitors for you. The warranty coverage for this TSB however is only 8years/80K miles. Not only did i work for Mitsubishi for many years in the past, but i am also a license smog check technician in California.
Thank you Joel. 2000 M.S. 94,000 miles It worked for me. I had a code PO 304 EGR control circuit. Fail inspection when for a 20 mile ride then right into the station and PASSED. So what is (EGR control circuit) mean. Thanks once again for all you do for all of us
so on a truck where the egr now has a blockoff plate, is there still a need got the evap canister or am i confused about something?
There's absolutely no need to remove the EVAP system (nor the EGR for that matter). The EVAP takes fuel vapors from the fuel tank and stores it in a charcoal canister to be purged and burned later. There is no benefit of removing it nor does it hinder performance in any way.