Sr leaning out and misfiring at wide open throttle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

1988montecarloss · 09-29-2017, 04:54 PM

Have checked ignition timing and checked marks on CAS and everything is timed correctly and lined up, have also ran a fuel pressure gauge and car makes perfect fuel pressure and adds psi as it should and during a pull doesn't drop pressure at all, got my new coils and maf in the mail tonight and installing those tomorrow

jdm-specs · 09-29-2017, 06:53 PM

Hope you don't me chiming in, but it's a good thing that you check fuel pressure reading while the lean problem is there.

I think you should focus on you lean condition under load first, as it is more likely causing it to break up, seems more likely to be a fuel delivery problem when it's only lean under load, compared to ignition. Do you know if the ECM is storing any fault codes?

Although the MAF seems reasonable to swap out. Maybe a good idea to swap out a set of known good injectors and check the ECM grounds for any rodent damage since the car was sitting for awhile. Since you changed out the fuel filter and verified fuel pressure already.

09-29-2017, 04:54 PM	#1
1988montecarloss Nissanaholic! Join Date: Jun 2012 Location: Bardley Age: 32 Posts: 1,996 Trader Rating: (24) Feedback Score: 24 reviews	Have checked ignition timing and checked marks on CAS and everything is timed correctly and lined up, have also ran a fuel pressure gauge and car makes perfect fuel pressure and adds psi as it should and during a pull doesn't drop pressure at all, got my new coils and maf in the mail tonight and installing those tomorrow __________________ IG: @Haley72692

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09-29-2017, 06:53 PM	#2
jdm-specs Leaky Injector Join Date: Feb 2011 Location: 626 socal Posts: 57 Trader Rating: (3) Feedback Score: 3 reviews	Hope you don't me chiming in, but it's a good thing that you check fuel pressure reading while the lean problem is there. I think you should focus on you lean condition under load first, as it is more likely causing it to break up, seems more likely to be a fuel delivery problem when it's only lean under load, compared to ignition. Do you know if the ECM is storing any fault codes? Although the MAF seems reasonable to swap out. Maybe a good idea to swap out a set of known good injectors and check the ECM grounds for any rodent damage since the car was sitting for awhile. Since you changed out the fuel filter and verified fuel pressure already.