RX7Club.com - Mazda RX7 Forum

3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
Sponsored by:
Full Detail Automotive

Could a bad knock sensor effect emissions?

Thread Tools
 
Search this Thread
 
Old 07-10-05, 11:54 PM
  #1  
Banned. I got OWNED!!!
Thread Starter
 
BATMAN's Avatar
 
Join Date: Feb 2001
Location: Silicon Valley Bay Area
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
Could a bad knock sensor effect emissions?
I've been told that my knock sensor is loose, hence my knock readings at the 200 mark from just revving it in neutral.

Would this effect emissions from the ECU adjusting the timing?
BATMAN is offline  
Reply Like
Old 07-11-05, 12:17 AM
  #2  
Mr. Links

iTrader: (1)
 
Mahjik's Avatar
 
Join Date: Aug 2001
Location: Kansas City, MO
Posts: 27,595
Received 40 Likes on 26 Posts
Are you using the PFC? IIRC, the PFC doesn't do anything with the knock reading aside from display it.
Mahjik is offline  
Reply Like
Old 07-11-05, 12:48 AM
  #3  
Banned. I got OWNED!!!
Thread Starter
 
BATMAN's Avatar
 
Join Date: Feb 2001
Location: Silicon Valley Bay Area
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
I'll test with the stock ECU. The smog tests requires a check engine light.
BATMAN is offline  
Reply Like
Old 07-11-05, 12:56 AM
  #4  
Mr. Links

iTrader: (1)
 
Mahjik's Avatar
 
Join Date: Aug 2001
Location: Kansas City, MO
Posts: 27,595
Received 40 Likes on 26 Posts
Originally Posted by BATMAN
I'll test with the stock ECU. The smog tests requires a check engine light.
The stock ECU does use the Knock Sensor, however I believe it just throws the car into limp mode (as well as CEL).
Mahjik is offline  
Reply Like
Old 07-11-05, 10:10 AM
  #5  
Banned. I got OWNED!!!
Thread Starter
 
BATMAN's Avatar
 
Join Date: Feb 2001
Location: Silicon Valley Bay Area
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
So no ill-effects on emissions?

I assume that limp mode means that it does kills boost/HP?
BATMAN is offline  
Reply Like
Old 07-11-05, 10:19 AM
  #6  
Mr. Links

iTrader: (1)
 
Mahjik's Avatar
 
Join Date: Aug 2001
Location: Kansas City, MO
Posts: 27,595
Received 40 Likes on 26 Posts
Originally Posted by BATMAN
So no ill-effects on emissions?

I assume that limp mode means that it does kills boost/HP?
Well, I'm not sure what that would do to emissions. I can't imagine it affecting emissions but you never know with these cars! Yep, limp mode does cripple boost/hp.
Mahjik is offline  
Reply Like
Old 07-11-05, 10:21 AM
  #7  
Rotary Freak

 
mad_7tist's Avatar
 
Join Date: Jan 2004
Location: tampa
Posts: 1,899
Likes: 0
Received 0 Likes on 0 Posts
could retard the timing which may cause you to fail a sniff test.. lots of other cars retard timing under excessive knock
mad_7tist is offline  
Reply Like

Trending Topics

Old 07-11-05, 10:29 AM
  #8  
Banned. I got OWNED!!!
Thread Starter
 
BATMAN's Avatar
 
Join Date: Feb 2001
Location: Silicon Valley Bay Area
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
Yea, that kinda makes sense.

I don't think too many people have experienced a bad knock sensor to failed emissions due to the timing being adjusted........
BATMAN is offline  
Reply Like
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Installed UIM gasket, now my engine won't run
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
Radiator fan and Power FC issue along with others
streetlegal?
New Member RX-7 Technical
13
03-17-22 02:46 PM
92 Efini FD3S T78 Streetport from Québec
Snoopy FD
Build Threads
25
12-08-15 01:45 PM
Microtech LT8 Multiple sensor errors & incorrect voltage reading
befarrer
Microtech
3
08-22-15 05:52 PM
Tags
Back to Subforum
3rd Generation Specific (1993-2002)
View Next Unread
Octane Rating with Additives (FYI)




Advanced Search
Quick Reply: Could a bad knock sensor effect emissions?


Reply Closed Thread Share

All times are GMT -5. The time now is 05:47 AM.