heres one for the sr20 gods... My baby is down - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Chrischeezer · 09-16-2006, 12:48 AM

sr20 redtop, stock maf, stock internals,stock fuelw/255 and ignition, bolt on everything else, safc, aem wideband. i dont have a fuel psi gauge.

Ok, for about 2 weeks now i have been have a problem that i couldnt figure out.
-the motor runs great, perfect air fuels across the board, then after 10 min of Driving, a boost or two, mid- throttle brake-up strikes (WOT still strong).During the brake-up all my sensors read normal. My air fuels spike to lean for a split sec. I pull the plugs.... all white, i gapped my plugs, changed MAF's, rewired the MAF wiring away from my turbo, checked all my piping and vac. lines. still the same problem.. i still drive it short distances hoping to figure out this problem....

3 or 4 days pass.....

rain for the past day
i wake up for work... auto start my car (like i do every morning).. it sounded fine on start up.. i get in the car 4 min later... put the key in... and give it a few small revs... all of a sudden ... POP!! BANG!!!!!!!!! misfire?? BANG!! detonation?!?!?!!!! wtf!!! i shut it off... and started it back up... the revs were ALL OVER THE PLACE every 2 sec. the motor would put out a deep !POP! sound or a BANG.. it would stay alive it self but rpm were undriveable, jumping from 1200 to 400 to 100... very rapidly

i got a ride to work and when i got back i auto started it just for shits....

........sounded fine, i shut it down and put it off to the morning,

anyone have any SMART ideas...

street_white180sx · 09-16-2006, 09:52 PM

check fuel pressure. sounds like a failing pump your car ran lean after a while it got worse. sounds like fuel pump. but check the prssure 1st that is critical try find sumone who has one.

ledzeppelin240 · 09-17-2006, 12:14 AM

Yeah I would go with checking out the fuel system first, although it does sound like you may have a misfire. What kind of plugs do you have?(platinum, etc???)

A misfire can cause a lean reading due to the lack of fuel being burnt so the computer then tries to add more fuel to fix the problem...

lok · 09-17-2006, 01:22 AM

check your ecu for codes and maybe the ecu it self.

the ecu might be bad since everything is stock.

09-16-2006, 12:48 AM	#1
Chrischeezer Zilvia FREAK! Join Date: Jul 2005 Location: earth Age: 41 Posts: 1,406 Trader Rating: (2) Feedback Score: 2 reviews	heres one for the sr20 gods... My baby is down sr20 redtop, stock maf, stock internals,stock fuelw/255 and ignition, bolt on everything else, safc, aem wideband. i dont have a fuel psi gauge. Ok, for about 2 weeks now i have been have a problem that i couldnt figure out. -the motor runs great, perfect air fuels across the board, then after 10 min of Driving, a boost or two, mid- throttle brake-up strikes (WOT still strong).During the brake-up all my sensors read normal. My air fuels spike to lean for a split sec. I pull the plugs.... all white, i gapped my plugs, changed MAF's, rewired the MAF wiring away from my turbo, checked all my piping and vac. lines. still the same problem.. i still drive it short distances hoping to figure out this problem.... 3 or 4 days pass..... rain for the past day i wake up for work... auto start my car (like i do every morning).. it sounded fine on start up.. i get in the car 4 min later... put the key in... and give it a few small revs... all of a sudden ... POP!! BANG!!!!!!!!! misfire?? BANG!! detonation?!?!?!!!! wtf!!! i shut it off... and started it back up... the revs were ALL OVER THE PLACE every 2 sec. the motor would put out a deep !POP! sound or a BANG.. it would stay alive it self but rpm were undriveable, jumping from 1200 to 400 to 100... very rapidly i got a ride to work and when i got back i auto started it just for shits.... ........sounded fine, i shut it down and put it off to the morning, anyone have any SMART ideas... __________________

09-16-2006, 09:52 PM	#2
street_white180sx Zilvia Member Join Date: May 2005 Location: Nassau, Bahamas Age: 39 Posts: 156 Trader Rating: (0) Feedback Score: 0 reviews	check fuel pressure. sounds like a failing pump your car ran lean after a while it got worse. sounds like fuel pump. but check the prssure 1st that is critical try find sumone who has one. __________________ 1993 S14 Silvia Slant Top, Blitz Bov, Fmic, Catback exhaust, HKS evc 3

09-17-2006, 12:14 AM	#3
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Yeah I would go with checking out the fuel system first, although it does sound like you may have a misfire. What kind of plugs do you have?(platinum, etc???) A misfire can cause a lean reading due to the lack of fuel being burnt so the computer then tries to add more fuel to fix the problem... __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

09-17-2006, 01:22 AM	#4
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	check your ecu for codes and maybe the ecu it self. the ecu might be bad since everything is stock.