 Fix It!
Need a solution? Find it here!
 High HC failure? Could be a gasoline vapor leak. This article tells the
tale of 4 1996 F-body GMs.
Dirty
Mass Air Flow (MAF) sensors can be the cause of high NOx readings in
failing vehicles.
1989 Chevy S-10 with engine change took some real detective work to figure out why it was a
gross polluter. Find out what the answer turned out to be.
New gas caps causing emissions failures? Yes, in a few cases.
Having a tough time diagnosing an emissions failure? Call a state Emissions
Technical Center for help!
Repair the problem, not the
symptoms. Today's computerized cars operate differently when they are driving down the road than
they do at idle. The old idle test won't tell you whether the vehicle will pass the I/M 240.
Was the vehicle properly preconditioned before it failed the test?
It makes a big difference!
Is the catalytic converter working? Here's a simple way to find
out.
With emissions limits tightened again in January 1999, more and
more catalytic converters are needing replacement.
Denver's high altitude adds a special complication to emissions repairs. Chris Chesney conducted
a study of six problem vehicle groups to find the best fixes for
vehicles with high fail rates. The six vehicle families examined are:
1982-1986 Chevrolet LDGT 5.0/5.7L, non-feedback Quadrajet
1983-1985 Ford LDGT 4.9L, EEC-IV feedback carburetor
1984-1985 GM/Jeep LDGT 2.8L, non-feedback Varijet
1984-1985 Low Altitude Honda Accord, carburetor feedback system
1985-1989 Imports: Hyundai, Mitsubishi, Plymouth; feedback carburetor
system
1983-1987 Toyota Tercel, computer controlled emissions
A survey of vehicles that are difficult to diagnose, and useful
strategies you can use to fix them right now.
Tighter emissions limits mean more business for repair
shops.
Having problems diagnosing NOx failures? You're not alone.
Restricted exhaust: Diagnosing the problem.
Dirty vehicle alert: 1982-91 Jeep Wagoneers and Grand
Cherokees with 360 cubic inch, 2-barrel engines.
Diagnosing finicky mid-1980s Fords.
Ford Taurus: Power steering fluid leakage affects O
2 sensor.
Low altitude Hondas: A real challenge to
repair.
What does the "check engine" light have to do with
emissions?
The tough question: Is the vehicle even worth fixing?
Do you know the current emissions limits in the Air Care Colorado program? Here are the charts:
Passenger car limits
Light duty truck limits
Heavy duty truck limits
Back to top.
| 
Envirotest Systems Corp., a division of Environmental Systems Products
Inc. ©1998-2003, Envirotest Systems Corp. All rights reserved.