General Miata Chat A place to talk about anything Miata

Smog help.

 
Old 02-24-2018, 08:42 PM
  #1  
Newb
Thread Starter
 
Join Date: Sep 2016
Posts: 41
Total Cats: -16
Default Smog help.


I need helping getting my car to pass smog , checked the cel, no codes this is my results
jvaz8367 is offline  
Old 02-24-2018, 08:58 PM
  #2  
Senior Member
iTrader: (2)
 
wackbards's Avatar
 
Join Date: Nov 2015
Location: Seattle
Posts: 1,096
Total Cats: 164
Default

Start cheap & simple: replace O2 sensor. A failing O2 sensor won't necessarily give you a CEL light.

A new sensor without connector will cost you about $15. You will need a 7/8" open end wrench, and some wire cutters/crimpers. You'll need one barrel style wire crimp connector, and you're gonna want to soak the old sensor in PB blast overnight.
wackbards is offline  
Old 02-24-2018, 09:50 PM
  #3  
Newb
Thread Starter
 
Join Date: Sep 2016
Posts: 41
Total Cats: -16
Default

Well I got a donor oxygen sensor 3 months ago from a buddy of mine , only reason I got it was because he cel was throwing a code and it seemed to have fixed it.
Originally Posted by wackbards View Post
Start cheap & simple: replace O2 sensor. A failing O2 sensor won't necessarily give you a CEL light.

A new sensor without connector will cost you about $15. You will need a 7/8" open end wrench, and some wire cutters/crimpers. You'll need one barrel style wire crimp connector, and you're gonna want to soak the old sensor in PB blast overnight.
jvaz8367 is offline  
Old 02-24-2018, 09:56 PM
  #4  
Senior Member
iTrader: (2)
 
wackbards's Avatar
 
Join Date: Nov 2015
Location: Seattle
Posts: 1,096
Total Cats: 164
Default

Check your spark plugs
check your air filter
check your AFM
Check your cat
wackbards is offline  
Old 02-24-2018, 10:05 PM
  #5  
Newb
Thread Starter
 
Join Date: Sep 2016
Posts: 41
Total Cats: -16
Default

Changed wires not long ago, put new sparkplugs last year but never gapped them how would I check the AFM and How do I check the cat
Originally Posted by wackbards View Post
Check your spark plugs
check your air filter
check your AFM
Check your cat
jvaz8367 is offline  
Old 02-24-2018, 10:07 PM
  #6  
Senior Member
iTrader: (2)
 
wackbards's Avatar
 
Join Date: Nov 2015
Location: Seattle
Posts: 1,096
Total Cats: 164
Default

Gap your plugs correctly. The tool is a dollar.
swap in a known good AFM & cat. They're both bolt on & readily available used.
wackbards is offline  
Old 02-24-2018, 10:41 PM
  #7  
Newb
Thread Starter
 
Join Date: Sep 2016
Posts: 41
Total Cats: -16
Default

Thank you my my man gonna gap the plugs and re check timing
Originally Posted by wackbards View Post
Gap your plugs correctly. The tool is a dollar.
swap in a known good AFM & cat. They're both bolt on & readily available used.
jvaz8367 is offline  
Old 02-24-2018, 11:16 PM
  #8  
Senior Member
iTrader: (2)
 
wackbards's Avatar
 
Join Date: Nov 2015
Location: Seattle
Posts: 1,096
Total Cats: 164
Default

Oh yeah, timing too. Factory is 10* advanced. Jam a paperclip between 10 and gnd in the little diagnostic box over on the driver's side of the engine bay while setting timing. Adjust the cas on the back of the passengers side of the head. It's one 12mm bolt, and you only need to loosen it. A little adjustment goes a long way, but you can adjust it while the engine is running. There is a blue connector that doesn't go to anything on the driver's side kind of by the headlight. That is the easiest way to get +12v for your tester light.
wackbards is offline  
Old 02-25-2018, 02:09 AM
  #9  
Newb
Thread Starter
 
Join Date: Sep 2016
Posts: 41
Total Cats: -16
Default

Thought a on the plug ?? All 4 are similar to this, they have around 20k miles .You can't tell from the picture but it's sort of grayish grainy looking

Originally Posted by wackbards View Post
Oh yeah, timing too. Factory is 10* advanced. Jam a paperclip between 10 and gnd in the little diagnostic box over on the driver's side of the engine bay while setting timing. Adjust the cas on the back of the passengers side of the head. It's one 12mm bolt, and you only need to loosen it. A little adjustment goes a long way, but you can adjust it while the engine is running. There is a blue connector that doesn't go to anything on the driver's side kind of by the headlight. That is the easiest way to get +12v for your tester light.

Last edited by jvaz8367; 02-25-2018 at 03:21 AM.
jvaz8367 is offline  
Old 02-25-2018, 12:43 PM
  #10  
Junior Member
iTrader: (1)
 
Tmorgan's Avatar
 
Join Date: Nov 2009
Posts: 88
Total Cats: 13
Default

grainy grayish is from slight oil burning i'd replace them to be safe. get your car nice and hot on the freeway before taking it in for smog your numbers are close enough if its ripping hot it'll pass.
Tmorgan is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
seraph
General Miata Chat
21
05-10-2010 09:04 PM
Bryan858
MSPNP
11
02-08-2010 09:47 PM
ThePass
General Miata Chat
15
01-09-2009 11:15 PM
Gotpsi?
General Miata Chat
12
05-11-2008 01:51 AM
masblue
General Miata Chat
12
01-11-2008 07:59 PM


Thread Tools
Search this Thread
Quick Reply: Smog help.


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.