SUPER Lean, cant figure it out - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

shift_down · 10-01-2012, 07:24 AM

Hello everybody.
Ok, so at idle I am at 18-20 afr and it is scaring me a bit. If I tap the gas, afrs go down to 11-13 and when I am at WOT the afrs are at around 10-10.5. As soon as I let go of the peddle after WOT, the afrs jump up to 22/full lean and the car drops down to around 500 rpm and acts like it wants to stall.

My question is, what would make the car be so lean at idle, and why would it go full lean after WOT?

1. My bov is recirculated
2. Enthalpy Tune
3. Z32 MAF wired in correctly

Thanks for the help

Synergy · 10-01-2012, 07:39 AM

Quote:

Originally Posted by shift_down

Hello everybody.
Ok, so at idle I am at 18-20 afr and it is scaring me a bit. If I tap the gas, afrs go down to 11-13 and when I am at WOT the afrs are at around 10-10.5. As soon as I let go of the peddle after WOT, the afrs jump up to 22/full lean and the car drops down to around 500 rpm and acts like it wants to stall.

My question is, what would make the car be so lean at idle, and why would it go full lean after WOT?

1. My bov is recirculated
2. Enthalpy Tune
3. Z32 MAF wired in correctly

Thanks for the help

Its normal dont worry about it. Off the gas and at idle it pumps alot of air and very little gas. My wideband goes from 6-20 i believe and I know when i get off the gas mine says LEAAAAAAAAN. Perfectly normal.

shift_down · 10-01-2012, 07:42 AM

Really? Because I know a few people that are 15afr at idle and after WOT. Why is my setup different? The car runs nice and healthy, but the numbers are whats scary.

cotbu · 10-01-2012, 11:01 AM

Full lean after wot is normal.
But everything else you're describing is not, The 18-20afr idle and even more so the 10-10.5 wot afr. I'm assuming this is not an e85 setup correct?
Give ups the dough, You need a retune!
or you can go, pull codes, check for boost/vacuum leaks, then timing and see what happens.
Also

shift_down · 10-01-2012, 11:10 AM

91 octane pump gas.
I think the WOT afrs are good. It should be rich under WOT, but the idle is scary.

Im going to check for codes and do a boost leak test and see what happens.

cotbu · 10-01-2012, 08:46 PM

Too rich of an AFR should concern you, as well!
You can look up why, later I guess?!

EDacIouSX · 10-01-2012, 08:51 PM

Quote:

Originally Posted by cotbu

Too rich of an AFR should concern you, as well!
You can look up why, later I guess?!

washes the oil off the cylinder wall, creates carbon build up on the piston

shift_down · 10-01-2012, 09:55 PM

10afr under WOT on a turbod ka24de is not a concern. silly zilvians :P

Synergy · 10-01-2012, 10:15 PM

10:1 is stupid rich if it doesnt hurt your motor your getting bad gas mileage bad power and lots of unburned HC and lots of carbon buildup.

AKA NOT GOOD.

shift_down · 10-01-2012, 10:20 PM

Yes yes, my bad. I know it is bad to constantly run like this, for sure. I am saying it is not a concern to me at the moment. I have the car on jack stands while revving it up and monitoring.

shift_down · 10-01-2012, 10:23 PM

I emailed enthalpy but he hasnt replied. I cant think of anything else causig this but the tune

10-01-2012, 07:24 AM	#1
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	SUPER Lean, cant figure it out Hello everybody. Ok, so at idle I am at 18-20 afr and it is scaring me a bit. If I tap the gas, afrs go down to 11-13 and when I am at WOT the afrs are at around 10-10.5. As soon as I let go of the peddle after WOT, the afrs jump up to 22/full lean and the car drops down to around 500 rpm and acts like it wants to stall. My question is, what would make the car be so lean at idle, and why would it go full lean after WOT? 1. My bov is recirculated 2. Enthalpy Tune 3. Z32 MAF wired in correctly Thanks for the help

10-01-2012, 07:42 AM	#3
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	Really? Because I know a few people that are 15afr at idle and after WOT. Why is my setup different? The car runs nice and healthy, but the numbers are whats scary. __________________ Ka24 t3/t04b + Z32MAF + 550 subys + Walbro 255 + enthalpy Tune + 91 octane

10-01-2012, 11:01 AM	#4
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Full lean after wot is normal. But everything else you're describing is not, The 18-20afr idle and even more so the 10-10.5 wot afr. I'm assuming this is not an e85 setup correct? Give ups the dough, You need a retune! or you can go, pull codes, check for boost/vacuum leaks, then timing and see what happens. Also __________________ LoverTechnologies "Half Broken Things!"

10-01-2012, 11:10 AM	#5
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	91 octane pump gas. I think the WOT afrs are good. It should be rich under WOT, but the idle is scary. Im going to check for codes and do a boost leak test and see what happens. __________________ Ka24 t3/t04b + Z32MAF + 550 subys + Walbro 255 + enthalpy Tune + 91 octane

10-01-2012, 08:46 PM	#6
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Too rich of an AFR should concern you, as well! You can look up why, later I guess?! __________________ LoverTechnologies "Half Broken Things!"

10-01-2012, 09:55 PM	#8
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	10afr under WOT on a turbod ka24de is not a concern. silly zilvians :P __________________ Ka24 t3/t04b + Z32MAF + 550 subys + Walbro 255 + enthalpy Tune + 91 octane

10-01-2012, 10:15 PM	#9
Synergy Leaky Injector Join Date: Feb 2010 Location: Merrimack Posts: 117 Trader Rating: (3) Feedback Score: 3 reviews	10:1 is stupid rich if it doesnt hurt your motor your getting bad gas mileage bad power and lots of unburned HC and lots of carbon buildup. AKA NOT GOOD.

10-01-2012, 10:20 PM	#10
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	Yes yes, my bad. I know it is bad to constantly run like this, for sure. I am saying it is not a concern to me at the moment. I have the car on jack stands while revving it up and monitoring. __________________ Ka24 t3/t04b + Z32MAF + 550 subys + Walbro 255 + enthalpy Tune + 91 octane

10-01-2012, 10:23 PM	#11
shift_down Zilvia Junkie Join Date: Sep 2012 Location: Tulsa Oklahoma Age: 35 Posts: 313 Trader Rating: (0) Feedback Score: 0 reviews	I emailed enthalpy but he hasnt replied. I cant think of anything else causig this but the tune __________________ Ka24 t3/t04b + Z32MAF + 550 subys + Walbro 255 + enthalpy Tune + 91 octane