Notices

Failed Emissions, but passed the second time

 
Old 09-06-2003, 12:42 PM
  #1  
'86 944 turbo
User
Thread Starter
 
'86 944 turbo's Avatar
 
Join Date: Feb 2003
Location: Toronto, Canada
Posts: 837
Default Failed Emissions, but passed the second time

Must be the guru chips because I failed the NOX. My HC was 23 and the limit was 112. The CO was .09 and the limit was .63 What do you guys get on the NOX test with aftermarket chips. On the second test I had the car on 3rd gear (1726 RPM) and put a fan in front of the car and passed.
'86 944 turbo is offline  
Old 09-06-2003, 01:23 PM
  #2  
Matt H
Super User
 
Join Date: Jul 2003
Posts: 15,712
Default

Is your car equipped with a catalytic converter?
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Matt H is offline  
Old 09-06-2003, 01:26 PM
  #3  
'86 944 turbo
User
Thread Starter
 
'86 944 turbo's Avatar
 
Join Date: Feb 2003
Location: Toronto, Canada
Posts: 837
Default

Yes, my car is equipped with a catalytic converter.
'86 944 turbo is offline  
Old 09-06-2003, 01:37 PM
  #4  
Matt H
Super User
 
Join Date: Jul 2003
Posts: 15,712
Default

You dont say how high the NOX was. Generally, I would look at the cat first since everything else passed. With the rest of the readings being so low that could be the simple solution.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Matt H is offline  
Old 09-06-2003, 01:39 PM
  #5  
'86 944 turbo
User
Thread Starter
 
'86 944 turbo's Avatar
 
Join Date: Feb 2003
Location: Toronto, Canada
Posts: 837
Default

the NOX was 1919 and the limit is 1252
'86 944 turbo is offline  
Old 09-06-2003, 02:09 PM
  #6  
RajDatta
Addict
Rennlist Member
 
RajDatta's Avatar
 
Join Date: Feb 2003
Location: NJ
Posts: 9,693
Default

I had a similar problem and swapping the O2 sensor fixed my problem.
Raj
RajDatta is offline  
Old 09-06-2003, 06:22 PM
  #7  
Matt H
Super User
 
Join Date: Jul 2003
Posts: 15,712
Default

02 sensor is also a good guess. I will grab a list of the things it could be for you tomorrow.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Matt H is offline  
Old 09-07-2003, 11:27 AM
  #8  
Flight_951
User
 
Join Date: Mar 2002
Location: Northern VA
Posts: 577
Default

The high NOx had been plaguing my car for over two years. This is while I had stock, then Autothority, and now Guru chips. I wasn't sure why. Finally a couple weeks ago, my car failed the test miserably (high HC, CO, NOx) at both rpms tested. I now believe the high NOx had been a symptom of a failing and clogging cat (creating high combustion chamber temperatures) for some time, and it finally let go altogether.

On the bright side, I just received my new 3" test pipe with cat from SFR yesterday. I'm installing it Tuesday and will retest the car. To be on the safe side, I changed the oil and will install new plugs too, but I'm definitely expecting to pass.

Flight_951 is offline  
 


Thread Tools
Search this Thread

Contact Us - About Us - 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: