S15 SR20DET Running Lean - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rotation3x · 02-21-2014, 07:13 PM

Have you checked your fuel filter?
Make sure your fuel pump is working 100%
Also check coolant temp sensor.

Im kinda having the same issue with my s14a sr20det, however

I dont have a wideband so im going by what color my plugs are. My plugs are white= lean
How did you flow test your injectors?

abaron13 · 02-21-2014, 07:16 PM

Fuel filter is brand new and the pump is 100%. Cts is new as well. I sent my injectors to a friend that has the machine to do it.

Fuego · 02-21-2014, 07:50 PM

Maybe I missed it but how are you sure the MAF is working properly? Injectors clean and working, pump is new, filter is new, no exhaust leak, no vac/boost leak... there's only so many options here.

abaron13 · 02-21-2014, 07:52 PM

Few posts up. I bought a known working maf in addition to the one I already had. And the voltages in and out are good

Def · 02-22-2014, 02:09 PM

Do you have the stock SMIC? The one on my redtop leaked horribly when boost testing it. They use rubber gaskets that harden up in the end tanks. I took it apart and RTV'd the end tanks to the core and it held up great after that.

I'd suggest doing a boost leak test, although that would run really rich usually as you're blowing metered air out.

abaron13 · 02-22-2014, 09:55 PM

No, fmic. Already stated no boost/vac leaks.

Def · 02-23-2014, 09:28 AM

What does running lean mean. What's your AFR at cruise, 0-4 psi, full boost (which is what psi)?

You're really not giving much info to run with here.

abaron13 · 02-23-2014, 09:30 AM

Cruise 16-off the scale
15-16 in boost
Havent taken it to wot for those reasons

Def · 02-24-2014, 06:29 AM

What pump do you have? At this point, I'd want to look at fuel pressure WHILE driving. A weak pump will show great fuel press at idle, but fall off once you start flowing.

What code ECU do you have? Should be WC I believe. That's what came in my S15 swap.

abaron13 · 02-24-2014, 06:33 AM

Already mentioned brand new dw 220. And WC is an s14 sr code. QT is the spec r ecu.

Def · 02-24-2014, 06:59 AM

Just tossing in a pump is not proper troubleshooting. You need data like fuel pressure under load to rule that out as an issue. If you're not going to properly troubleshoot, then good luck finding the problem.

abaron13 · 02-24-2014, 07:04 AM

I not only have proper fuel pressure at idle I have steady pressure with increased rpm and a proper 1 psi increase per 1 psi of boost. Fuel pressure is fine.

02-21-2014, 07:50 PM	#33
Fuego Zilvia Addict Join Date: Nov 2011 Location: Las Vegas Age: 31 Posts: 629 Trader Rating: (0) Feedback Score: 0 reviews	Maybe I missed it but how are you sure the MAF is working properly? Injectors clean and working, pump is new, filter is new, no exhaust leak, no vac/boost leak... there's only so many options here. __________________

02-22-2014, 02:09 PM	#35
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	Do you have the stock SMIC? The one on my redtop leaked horribly when boost testing it. They use rubber gaskets that harden up in the end tanks. I took it apart and RTV'd the end tanks to the core and it held up great after that. I'd suggest doing a boost leak test, although that would run really rich usually as you're blowing metered air out. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

02-23-2014, 09:28 AM	#37
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	What does running lean mean. What's your AFR at cruise, 0-4 psi, full boost (which is what psi)? You're really not giving much info to run with here. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

02-24-2014, 06:29 AM	#39
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	What pump do you have? At this point, I'd want to look at fuel pressure WHILE driving. A weak pump will show great fuel press at idle, but fall off once you start flowing. What code ECU do you have? Should be WC I believe. That's what came in my S15 swap. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

02-24-2014, 06:59 AM	#41
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	Just tossing in a pump is not proper troubleshooting. You need data like fuel pressure under load to rule that out as an issue. If you're not going to properly troubleshoot, then good luck finding the problem. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

02-21-2014, 07:13 PM	#31
rotation3x Zilvia Member Join Date: Jun 2005 Location: virginia Age: 35 Posts: 272 Trader Rating: (2) Feedback Score: 2 reviews	Have you checked your fuel filter? Make sure your fuel pump is working 100% Also check coolant temp sensor. Im kinda having the same issue with my s14a sr20det, however I dont have a wideband so im going by what color my plugs are. My plugs are white= lean How did you flow test your injectors?

02-21-2014, 07:16 PM	#32
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	Fuel filter is brand new and the pump is 100%. Cts is new as well. I sent my injectors to a friend that has the machine to do it.

02-21-2014, 07:52 PM	#34
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	Few posts up. I bought a known working maf in addition to the one I already had. And the voltages in and out are good

02-22-2014, 09:55 PM	#36
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	No, fmic. Already stated no boost/vac leaks.

02-23-2014, 09:30 AM	#38
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	Cruise 16-off the scale 15-16 in boost Havent taken it to wot for those reasons

02-24-2014, 06:33 AM	#40
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	Already mentioned brand new dw 220. And WC is an s14 sr code. QT is the spec r ecu.

02-24-2014, 07:04 AM	#42
abaron13 Zilvia Junkie Join Date: Mar 2011 Location: Cleveland Age: 29 Posts: 385 Trader Rating: (24) Feedback Score: 24 reviews	I not only have proper fuel pressure at idle I have steady pressure with increased rpm and a proper 1 psi increase per 1 psi of boost. Fuel pressure is fine.

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