afr problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

djl601 · 12-20-2007, 02:20 PM

hi,
i have a s13 with blacktop sr and some basic bolt-ons, FMIC, SAFC, and aem wideband gauge, and also openair

when i cold start the car, it will give me around 13.6 for maybe half to one min, then it goes down to around 14.6-15, but when i'm driving, whenever i let go the gas peddle, the gauge will show me " --- " which means over 18 afr

what might cause this problem? and how can i adjust it from my safc?

i was going to do a dyno tune, but a friend of mine to me it's a waste of time and money on dyno tune a car with nothing but a SAFC! what do you guy think?

I'm also looking for a Apexi power fc, but wondering if i really need it now for a basic set up like mine. my goal is to get around 300 whp, but that's not any time soon.

basic setup sr20 + apexi pfc = OK?

thanks

lok · 12-20-2007, 02:21 PM

wait wait wait

you let off the gas and the car runs lean

oh man

2Slow40 · 12-20-2007, 02:29 PM

Did you install the wideband upside down?

djl601 · 12-20-2007, 02:30 PM

i follow the pics on the instruction....or do you have any pics shows the position of the sensor? thanks

lok · 12-20-2007, 02:45 PM

oh man oh man oh man

come on

PoorMans180SX · 12-20-2007, 03:15 PM

Dude
in a semi-modern engine like the sr20, the injectors basically shut off when you're coasting. It's totally normal.

djl601 · 12-20-2007, 03:21 PM

HAHAH....SORRY SORRY...worry too much with little knowledge....now i learn more....

thanks thanks

posdrift240 · 12-20-2007, 03:24 PM

Ya if it didnt go lean then you would have a problem. Your numbers sound normal.

mr_240sx · 12-23-2007, 04:26 PM

wow this made my day......

basically if you dont know what your doing or have little to no knowledge then dont try to work on your car.....pay professionals to do that.

all in all everything seems fine.

Koopa Troopa · 12-23-2007, 10:10 PM

Change those idling numbers.. You can go leaner.

12-20-2007, 02:20 PM	#1
djl601 Zilvia Member Join Date: Sep 2006 Location: usa Posts: 162 Trader Rating: (2) Feedback Score: 2 reviews	afr problem hi, i have a s13 with blacktop sr and some basic bolt-ons, FMIC, SAFC, and aem wideband gauge, and also openair when i cold start the car, it will give me around 13.6 for maybe half to one min, then it goes down to around 14.6-15, but when i'm driving, whenever i let go the gas peddle, the gauge will show me " --- " which means over 18 afr what might cause this problem? and how can i adjust it from my safc? i was going to do a dyno tune, but a friend of mine to me it's a waste of time and money on dyno tune a car with nothing but a SAFC! what do you guy think? I'm also looking for a Apexi power fc, but wondering if i really need it now for a basic set up like mine. my goal is to get around 300 whp, but that's not any time soon. basic setup sr20 + apexi pfc = OK? thanks

12-20-2007, 03:15 PM	#6
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 37 Posts: 5,616 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	Dude in a semi-modern engine like the sr20, the injectors basically shut off when you're coasting. It's totally normal. __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.

12-20-2007, 03:24 PM	#8
posdrift240 Zilvia Member Join Date: Oct 2007 Location: Rhea Posts: 207 Trader Rating: (0) Feedback Score: 0 reviews	Ya if it didnt go lean then you would have a problem. Your numbers sound normal. __________________

12-23-2007, 10:10 PM	#10
Koopa Troopa Post Whore! Join Date: Sep 2006 Location: 北谷著, 沖縄県、日本 Posts: 2,565 Trader Rating: (3) Feedback Score: 3 reviews	Change those idling numbers.. You can go leaner. __________________ Buy my Stillway shifter!

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12-20-2007, 02:21 PM	#2
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	wait wait wait you let off the gas and the car runs lean oh man

12-20-2007, 02:29 PM	#3
2Slow40 Zilvia Junkie Join Date: Sep 2007 Location: CA Age: 37 Posts: 522 Trader Rating: (1) Feedback Score: 1 reviews	Did you install the wideband upside down?

12-20-2007, 02:30 PM	#4
djl601 Zilvia Member Join Date: Sep 2006 Location: usa Posts: 162 Trader Rating: (2) Feedback Score: 2 reviews	i follow the pics on the instruction....or do you have any pics shows the position of the sensor? thanks

12-20-2007, 02:45 PM	#5
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	oh man oh man oh man come on

12-20-2007, 03:21 PM	#7
djl601 Zilvia Member Join Date: Sep 2006 Location: usa Posts: 162 Trader Rating: (2) Feedback Score: 2 reviews	HAHAH....SORRY SORRY...worry too much with little knowledge....now i learn more.... thanks thanks

12-23-2007, 04:26 PM	#9
mr_240sx Post Whore! Join Date: Nov 2004 Location: Ottawa Age: 38 Posts: 6,320 Trader Rating: (4) Rides Gallery: mr_240sx Feedback Score: 4 reviews	wow this made my day...... basically if you dont know what your doing or have little to no knowledge then dont try to work on your car.....pay professionals to do that. all in all everything seems fine.