My 2000 Sonata flunked the California smog test.
I have a code reader, which showed no stored codes. I failed to
note that three of the monitors had completed their sequences.
I took it into the smog shop, where it passed all the emissions
requirements, but failed due to a loose, leaking hose between the
two valve covers, which had prevented one of the monitors from
completing, and failed the visual inspection.
I replaced the hose, then ran the two drive cycles to satisfy the
monitors that all the sensors had been put through their tests
and had replied properly. Again, there were no stored codes.
The monitors can do their thing eventually just from normal
driving. However, they need lots of that normal driving, and when
one's in a hurry, one does the drive cycles.
I understand that Hyundai won't release these routines. I was
able to find them a few years ago. I had a long phone
conversation with a guy at the State air resources board, who
recommended that I go into a smog shop and check their copy of
_Motor's Drive Cycles._
And, lo, therein I found the slow and
fast cycles for a whole range of Hyundais of many years.
Performing these tests is quite a challenge, especially if
there's any traffic on the road, red lights, or stop signs. It's
pretty hair-raising and takes two people, one to read the
instructions out loud and hold the stopwatch; the other to drive
There are 15 and 16 steps on each of the two drive cycles. Here
is one of them from the _highway_
"Accelerate moderately. Drive at 20-25 mph for 20 seconds.
Increase speed to 40-55 for 85 seconds, then decelerate to 0 over
60 seconds. Idle 15 seconds."
Now, just visualize how you will carry this out on a hilly, curvy
two-lane road with some shoulders, light (but real) traffic, a
couple of traffic lights, and three stop signs, all the time
looking in the mirror for oncoming vehicles.
I made lots of errors, especially by overrunning the top speeds
of the steps and misjudging the alotted time for each
Amazingly, all three of the outstanding monitors were satisfied.
And I passed the (free) re-test.
This is the second time I've had to do this. I discussed the wild
ride with the smog technician. He said that VWs and Nissans have
cycles that are just as insane. I figured that nobody can perform
these tests safely or accurately on real roads, and that they can
only be done, practically, on test tracks or dynamometers (just
like our smog stations now are required to use).
The shop owner said that she's never heard of anyone running
these routines on a dynamometer, and there not many test tracks
in my neighborhood.
So, if a person needs to get these monitors completed and doesn't
have the time to do 100 miles of regular driving, what's a
rational way to perform these routines?
I'm truly stumped.