SR20 running too lean to idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Strykermcgee · 03-04-2014, 11:15 PM

My SR20det is showing really lean on my aem uego wide band and will not idle and cannot be held at a specific rpm, only feathering the throttle will keep it running. now if you introduce a 15sec spray of carb/brake clean to the MAF filter (z32 MAF) and then start it up, it idles and runs perfect and shows good readings on the wide band, and then after the carb/brake clean evaporates/gets used up, you can watch the a/f slowly go leaner and leaner. Ran the same test w/ known good ka24de MAF and got same results. (I have wiring specialties wire harness, came with several MAF pigtails) 99% sure timing is excelent. I know this sounds like a vacuum leak but does any one have any other ideas?

swapped red top s13 into s13 hatch
new wire harness
front mount intercooler
gt28r turbo
stock s13 sr injectors (yes i know these are not big enough for this turbo, only trying to get it to run and idle correctly)
z32 MAF
walbro 255 fuel pump (1 year old, was working great with the KA24de previously in the car)

battosaii930 · 03-04-2014, 11:45 PM

could be the FPR sounds like there isnt enough fuel pressure in the system

Livid_240sx · 03-05-2014, 06:32 AM

Quote:

Originally Posted by battosaii930

could be the FPR sounds like there isnt enough fuel pressure in the system

Haven't done an Sr swap, but aren't you supposed to upgrade your fuel pump? Again I'm not sure, just think I remember reading that.

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Livid_240sx · 03-05-2014, 06:33 AM

Never mind, just read you upgraded. My bad haha its coffee o'clock..

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Strykermcgee · 03-05-2014, 06:38 AM

Haha, no problem, however after a good night sleep, I'm fairly certain Its the FPR. I'm running the stock one and I have an adj one. Will post results tonight

Strykermcgee · 03-05-2014, 08:12 PM

Well, adjusting the fuel pressure didnt seem to help, next step im guessing is ecu?

Strykermcgee · 03-06-2014, 10:02 PM

Turns out, bad Maf!

kruked · 03-07-2014, 09:43 AM

I was going to mention that if your ECU is tuned for the z32 MAFS, putting the kae MAFS on will not give you better results.

Glad that you figured out the problem...hopefully.

03-04-2014, 11:15 PM	#1
Strykermcgee Join Date: Jun 2013 Location: DFW Age: 29 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	SR20 running too lean to idle My SR20det is showing really lean on my aem uego wide band and will not idle and cannot be held at a specific rpm, only feathering the throttle will keep it running. now if you introduce a 15sec spray of carb/brake clean to the MAF filter (z32 MAF) and then start it up, it idles and runs perfect and shows good readings on the wide band, and then after the carb/brake clean evaporates/gets used up, you can watch the a/f slowly go leaner and leaner. Ran the same test w/ known good ka24de MAF and got same results. (I have wiring specialties wire harness, came with several MAF pigtails) 99% sure timing is excelent. I know this sounds like a vacuum leak but does any one have any other ideas? swapped red top s13 into s13 hatch new wire harness front mount intercooler gt28r turbo stock s13 sr injectors (yes i know these are not big enough for this turbo, only trying to get it to run and idle correctly) z32 MAF walbro 255 fuel pump (1 year old, was working great with the KA24de previously in the car)

03-05-2014, 06:33 AM	#4
Livid_240sx Leaky Injector Join Date: Nov 2013 Location: South East Michigan Age: 33 Posts: 135 Trader Rating: (0) Feedback Score: 0 reviews	Never mind, just read you upgraded. My bad haha its coffee o'clock.. Sent from my SCH-I535 using Tapatalk __________________ '91 s13 (Drift Rocket Under Construction) 2000 civic Si Coupe (Daily)

03-07-2014, 09:43 AM	#8
kruked Nissanaholic! Join Date: Feb 2012 Location: someone's sisters' pants Posts: 2,288 Trader Rating: (37) Feedback Score: 37 reviews	I was going to mention that if your ECU is tuned for the z32 MAFS, putting the kae MAFS on will not give you better results. Glad that you figured out the problem...hopefully. __________________ I like my bikes how I like my b¡tches...naked! 2014 Triumph Street Triple Last edited by kruked; 03-07-2014 at 10:15 AM..

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03-04-2014, 11:45 PM	#2
battosaii930 Leaky Injector Join Date: Nov 2006 Location: miami Age: 33 Posts: 112 Trader Rating: (0) Feedback Score: 0 reviews	could be the FPR sounds like there isnt enough fuel pressure in the system

03-05-2014, 06:38 AM	#5
Strykermcgee Join Date: Jun 2013 Location: DFW Age: 29 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Haha, no problem, however after a good night sleep, I'm fairly certain Its the FPR. I'm running the stock one and I have an adj one. Will post results tonight

03-05-2014, 08:12 PM	#6
Strykermcgee Join Date: Jun 2013 Location: DFW Age: 29 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Well, adjusting the fuel pressure didnt seem to help, next step im guessing is ecu?

03-06-2014, 10:02 PM	#7
Strykermcgee Join Date: Jun 2013 Location: DFW Age: 29 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Turns out, bad Maf!