Rb25 spark plug issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240-mike · 03-20-2017, 01:32 AM

Okay so I've looked through many different threads and can't find a straight forward answer to my problem so please don't give me the bs about starting another thread. So I can't figure out what to gap my plugs to, I have fmic full exhaust upgraded fuel pump stock Ecu stock intake etc. I was running on 10psi and every time I'd get into high boost it cut out so I figured I needed colder plugs along with regapping them, I've Gapped them several times with no luck, everytime I give it gas it won't rev past 3 grand and just falls on its face. Any helps appreciated, oh and the plugs I went with were the NGK bkr7es I believe, thanks again.

240-mike · 03-26-2017, 02:50 PM

Got a new maf sensor didn't solve the issue but now it'll rev to 4K and sometimes even 5k
Still falls on its face and won't build boost

KAT-PWR · 03-26-2017, 03:08 PM

Have you boost leak tested

Loufig · 03-27-2017, 06:46 AM

Boost leak test that would be a waste of time and surely has nothing to do with not being able to boost...

socalbmxr06 · 03-27-2017, 09:27 AM

Definitely check for a boost/ vacuum leak. Spark plug gap on the RB25 should be .028 to prevent spark blow out. RB25 oem coil packs don't pack much of a punch.

If there are no leaks and plugs are good I would check injectors to make sure they aren't leaking.

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03-20-2017, 01:32 AM	#1
240-mike Join Date: Jan 2017 Location: Pennsylvania Age: 28 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	Rb25 spark plug issue Okay so I've looked through many different threads and can't find a straight forward answer to my problem so please don't give me the bs about starting another thread. So I can't figure out what to gap my plugs to, I have fmic full exhaust upgraded fuel pump stock Ecu stock intake etc. I was running on 10psi and every time I'd get into high boost it cut out so I figured I needed colder plugs along with regapping them, I've Gapped them several times with no luck, everytime I give it gas it won't rev past 3 grand and just falls on its face. Any helps appreciated, oh and the plugs I went with were the NGK bkr7es I believe, thanks again.

03-26-2017, 03:08 PM	#3
KAT-PWR Nissanaholic! Join Date: Dec 2011 Location: US Posts: 2,040 Trader Rating: (11) Rides Gallery: KAT-PWR Feedback Score: 11 reviews	Have you boost leak tested __________________ MRP Manufacturing

03-26-2017, 02:50 PM	#2
240-mike Join Date: Jan 2017 Location: Pennsylvania Age: 28 Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	Got a new maf sensor didn't solve the issue but now it'll rev to 4K and sometimes even 5k Still falls on its face and won't build boost

03-27-2017, 06:46 AM	#4
Loufig Leaky Injector Join Date: Jul 2014 Location: Indiana Age: 49 Posts: 66 Trader Rating: (0) Feedback Score: 0 reviews	Boost leak test that would be a waste of time and surely has nothing to do with not being able to boost...

03-27-2017, 09:27 AM	#5
socalbmxr06 Join Date: Nov 2009 Location: murrieta, ca Posts: 25 Trader Rating: (1) Feedback Score: 1 reviews	Definitely check for a boost/ vacuum leak. Spark plug gap on the RB25 should be .028 to prevent spark blow out. RB25 oem coil packs don't pack much of a punch. If there are no leaks and plugs are good I would check injectors to make sure they aren't leaking. Sent from my iPhone using Tapatalk