Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

 
Old 07-07-2011, 06:46 PM
  #1  
Trial User
Thread Starter
 
Join Date: Jul 2011
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Did oil& filter, air filter, cat. conv. 2yrs. old, added injector cleaner. What else can I try? Note: lots of air pressure in gas tank, no smoke from tail pipe. Runs good, never misses, good gas mileage. Any suggestions??
grandmato5 is offline  
Old 07-07-2011, 06:51 PM
  #2  
Honda-Tech Member
 
Join Date: Feb 2008
Posts: 45,259
Likes: 0
Received 1 Like on 1 Post
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Plugs, wires, cap, rotor, ignition timing
Former User is offline  
Old 07-07-2011, 07:03 PM
  #3  
Honda-Tech Member
 
Join Date: Jul 2011
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

one tip i can give you to pass emissions is drive your car somewhat hard before you go to the dyno this way all the temps are hot which will make the motor burn more efficient
LivinLoud94 is offline  
Old 07-08-2011, 11:12 PM
  #4  
Honda-Tech Member
 
Join Date: May 2000
Location: NorCal, USA
Posts: 518
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

It would help if you posted the criteria that you did not meet.
SlayANT is offline  
Old 07-08-2011, 11:35 PM
  #5  
Honda-Tech Member
 
Join Date: Mar 2010
Posts: 49
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Originally Posted by LivinLoud94 View Post
one tip i can give you to pass emissions is drive your car somewhat hard before you go to the dyno this way all the temps are hot which will make the motor burn more efficient
This is actually a very very good suggestion. (+2) I had a four banger mustang that would not pass deq, so I just drove like 20 miles to a DEQ, and held my foot on the gas (holding the engine at roughly 2k rpm) at every single light...lol It was nice and hot when I went through and it finally passed just fine hehe
Dee_333 is offline  
Old 07-09-2011, 03:02 AM
  #6  
Honda-Tech Member
 
rhymeshark916's Avatar
 
Join Date: Mar 2008
Location: Sacramento, CA, USA
Posts: 1,442
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

o2 sensor
rhymeshark916 is offline  
Old 07-09-2011, 03:50 AM
  #7  
Technical Hero
 
HondaPartsHero's Avatar
 
Join Date: May 2002
Location: Charlotte, NC, 28227
Posts: 9,876
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Originally Posted by SlayANT View Post
It would help if you posted the criteria that you did not meet.
This

Plus list any and all maintenance you have performed recently (tune up, air filter, etc). Also do you have any check engine lights. We need some background before you start throwing money at it.

There are numerous components that if not working properly, can cause high emissions or an emissions test failure. You should read each of the components description and operation in the emission control system section of the manufacturer's manual covering your vehicle in order to gain a working knowledge of each system. These systems are designed to reduce the emissions (as set by California emissions standards). If any of these emissions components fail, emissions can increase. Along with these systems, other components such as spark plugs, plug wires, and filters can also increase emissions if defective. Emissions or smog is a generic term used to describe certain harmful gases in the exhaust. Hydrocarbons (HC), Carbon Monoxide (CO) and Oxides of Nitrogen (NOX) are usually measured in an emissions test. The state and federal government place certain limits on each of these harmful gases emitted. Carbon Dioxide (CO2) is also measured, but is not considered a harmful gas. When the measured gases from the vehicle exceed the state or federal limits, the vehicle fails the emissions test.

DIAGNOSIS
Diagnosis of high emissions can be an involved process that usually requires special tools and measuring equipment. However, armed with a test report indicating what gases are high can help you determine what systems may not be functional. If the vehicle has failed as a result of high CO and HC, the CO failure should be diagnosed first. If the "Service Engine Soon" or "Check Engine" light is on it should be diagnosed prior to any emissions diagnosis.

CO Failure is the result of an excessively rich air fuel mixture. The following is a list of the most common causes:
- Defective Oxygen Sensor
- Inoperative Air Injection System (if equipped)
- Leaking or defective Fuel Injectors
- Restricted air filter (especially if high CO is present only at high RPM)
- Vacuum leaks resulting in improper MAP sensor operation
- Defective air mass or air flow sensor
- Malfunctioning fuel evaporation system or purge valve
- Defective Catalytic Converter
- Defective thermostat (cooling system), thermostat stuck open
- Oil contaminated with fuel, excessive miles between oil changes

HC Failure is the result of incomplete combustion. Any item that causes incomplete combustion can result in high HC. The most common causes are:
- Worn spark plugs
- Defective spark plug wires
- Worn distributor cap and/or rotor
- Improper ignition timing, usually over advanced
- Vacuum leaks
- Engine mechanical failure, low compression, worn valves, excessive oil consumption

NOX Failure is the result of combustion temperatures that are too high. The most common causes are:
- Inoperative Exhaust Gas Recirculation System (EGR)
- Cooling system malfunction, engine running too hot (restricted radiator, defective thermostat, etc.)
- Over advanced ignition timing
- Excessively lean air fuel mixture (defective oxygen sensor, MAP sensor or Air Mass Sensor)

PRECAUTIONS, TIPS, and NOTES
If the engine is due for a tune up it is wise to perform preventative maintenance prior to spending too much time diagnosing the emissions problem. Proper vehicle maintenance can go a long way in keeping a vehicle's emissions within specifications. A complete tune-up should consist of: spark plugs, ditributor cap and rotor (if equipped), spark plug wires, air filter, fuel filter, and oil change. Although performing this service is no gaurantee of a passed emissions test, it certainly increases the likelyhood of success. If the vehicle has over 60,000 miles on it and has failed for the reason of high CO, installation of a new oxygen sensor might be a prudent investment especially if the vehicle is only equipped with one sensor.

http://www.auto-repair-help.com/auto...st_failure.php
HondaPartsHero is offline  
Old 07-09-2011, 08:03 AM
  #8  
Trial User
 
Join Date: Jan 2011
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Icon2 Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Originally Posted by grandmato5 View Post
Did oil& filter, air filter, cat. conv. 2yrs. old, added injector cleaner. What else can I try? Note: lots of air pressure in gas tank, no smoke from tail pipe. Runs good, never misses, good gas mileage. Any suggestions??
i have a problem with passing emissions as of right now too... my civic is runnig very rich and idk why?
stratmandoo88@y is offline  
Old 06-29-2015, 10:48 PM
  #9  
I never narc'd on nobody!
iTrader: (1)
 
NotARaCist's Avatar
 
Join Date: Nov 2013
Posts: 9,538
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!

Step #1: Don't threadjack. If, after searching, reading, and working, you still have problems, make your own. When making your own thread, be sure to read the FAQ sticky first, as well as the rules sticky. Translation: One of your questions is answered directly in one of those threads.
Step #2: Don't thread necro. This thread is 4 years old. It should have been left dead.
NotARaCist is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
trevlf
Honda Civic / Del Sol (1992 - 2000)
3
04-24-2012 07:04 AM
SIDEXIT
Honda Civic / Del Sol (1992 - 2000)
8
01-10-2008 02:22 PM
josephshark
Honda Civic / Del Sol (1992 - 2000)
103
02-02-2006 09:03 AM
743power
Tech / Misc
18
12-11-2005 07:28 PM
raene
Tech / Misc
4
01-09-2003 02:31 PM


Thread Tools
Search this Thread
Quick Reply: Failed emissions 1994 Honda Civic SI -1.6 ltr. - HELP!!!!!


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: