FD running on rich side....

[jasonlel]

Hi gurus,

I\'m curruntly using a stock FD ECU. Did CO check and found out my FD is running on very rich side on idle. Any idea why?  :xconfused

 
*FYI my FD ECU printed a big code "N3A7", dont see any Mazda wording, but I did see a "Denso" wording.

[rx7veilside]

all jap cars run rich get apexi and have it mapped for better economy

[jasonlel]

all jap cars run rich get apexi and have it mapped for better economy

Hmmmm yea... but mind is kinda above normal rich as in high side...

This morning I did a reset ECU. Hmmmm I dont know if there\'s any diff. but I can still smell abit of the feul smell. By the way my exhaust temp shows about 400d - 600d for city drive....

What you guys think?


rx7veilside,
Hmmmm apexi? You recommend SAFC?


Cheers,
Jason X

[Col]

Mine is exactly the same, strong smell of fuel running really rich, i have knightsports ECU, have been told to put in Apexi PFC and get it mapped to sort out the problem, but I am happier the car runns rich than lean!

[jasonlel]

Mine is exactly the same, strong smell of fuel running really rich, i have knightsports ECU, have been told to put in Apexi PFC and get it mapped to sort out the problem, but I am happier the car runns rich than lean!

Hmmmm looks like I do not need to worry so much then.... Maybe I will get a SAFC or something like that...


Cheers,
Jason X

[rx7veilside]

these cars do not need to run rich when properly mapped..all jap cars run rich compared to uk cars which are tuned for emmissions..my fd on a run 60-80mph off boost approx 22mpg and cld prob achieve better as most of the mapping has been for on boost..the us forums are veering towards running afr of between 14-16/1 afr

[Sy.]

mine used to run very rich ... i can get teenage kids high when i drive past .. its all good as much better then being lean ..... but it has improved loads since i got the PFC and had Carl map it .

[jasonlel]

these cars do not need to run rich when properly mapped..all jap cars run rich compared to uk cars which are tuned for emmissions..my fd on a run 60-80mph off boost approx 22mpg and cld prob achieve better as most of the mapping has been for on boost..the us forums are veering towards running afr of between 14-16/1 afr

Hmmmmmm ok.. I\'m just making assumption, could I have a malfunction O2 sensor or something wrong with my TPS? Just as wild guess.... What say you guys?

Infact how do I know if my O2 sensor has gone bad?

I know I can retune is by using atleast a piggyback, but first I would like to know the root cause of this problem.......

[Brett]

If the O2 sensor has malfunctioned I would expect to see the ECU post an error code and go into limp home mode.

[Kieron]

Still it doesnt mean its running rich at the top end!

Mine stinks, pops and bangs and sometimes get massive flames :flamed

But at the top end of the revs I run lean.

[rmagictastic]

can i suggest that if youve got any non standard mods( catback/intake), then your air will be floowing more freely than your STANDARD ECU was set for, as a result it will compensate to avoid detonation by ploughing shed loads of fuel in there.

the best way to solve this is with a apexi power fc, and have it tuned.

my 2p\'s worth

(the above is from my rex doing exactly the same)

Nick

[jasonlel]

If the O2 sensor has malfunctioned I would expect to see the ECU post an error code and go into limp home mode.

Hi Brett,

Hmmm good idea, but I my FD is one of those model without the check engine light and I cant check error code....  :reallymad