serious richness, maybe worse (sr20det) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

malofquist · 09-04-2006, 03:03 PM

kinda noob question, i appologize in advance for the ignorance:

I have 1993 S13 SE.

I paid a shop to put in an SR20det + I'cooler + 5speed + coilovers.

I was purty unimpressed with the 202hp! So I scheduled some upgrades.

550cc injectors
Z32 MAF
GT2871
reflashed ECU (probably a big mistake)
boost gauge
piping blah blah

when i picked it up after these upgrades, she dyno'ed 319rwhp at ~19psi. Fun ride for sure. It hit the point where it's traction limited.

I like to get to know a car leaving it at 10-15psi boost. I put a bunch miles on it at once (road trip). The next day it wouldn't even idle. I noticed that the FPR had backed out and a plugged hose coming off of the BOV had come unplugged. I replugged and tweaked FPR until the car idles.

car runs like total crap, feels like a go-kart briggs/straton motor missing, and backfiring. white smoke.

then I notice fuel dripping from flanges before and after the Cat. Oil smells like fuel. Oil level higher now than when I picked it up.

maybe the injectors are staying open, maybe the reflashed ECU is all outta whack.

I ordered a wideband O2 sensor and a fuel computer (the XFC from powertraincontrolsolutions). i ordered these as tuning tools, but I think I gots' more problems than tuning.

should I pull out the plugs and look for gas soaked plugs? Should I pull the fuel rail and see if the injectors are pulsing as they should?

^^ i just read some of those tips by searching, but I dunno know what to do first.

*NemeGuero* · 09-04-2006, 03:28 PM

god damn that sucks..

umm.. basically double check all the fundamentals. Make sure everything is tight and secure.. all vac lines are in place..

couldn't hurt to check your plugs..

I hate to suggest it.. but if your oil smells like fuel.. bad rings comes to mind. Especially with the smoke. Check compression.

malofquist · 09-04-2006, 05:27 PM

^^ pic of the blackest plug. (#-whatever, closest to the firewall) the rest aren't too bad. a little shiny and black. I put each one near ground and they do fire. i woulda guessed two not firing at all the way she's running

malofquist · 09-10-2006, 12:41 PM

wow, so many helpful people on this forum. thank you for all of your support and advice!!

anyway, it was an injector front seal is all.

cylinder #2's 550cc injector was pouring fuel regarless of crank angle, etc.

I thought I'd post the solution so it'd come up in someone's searches.

09-04-2006, 03:03 PM	#1
malofquist Join Date: Sep 2006 Location: McLean, VA Posts: 22 Trader Rating: (1) Feedback Score: 1 reviews	serious richness, maybe worse (sr20det) kinda noob question, i appologize in advance for the ignorance: I have 1993 S13 SE. I paid a shop to put in an SR20det + I'cooler + 5speed + coilovers. I was purty unimpressed with the 202hp! So I scheduled some upgrades. 550cc injectors Z32 MAF GT2871 reflashed ECU (probably a big mistake) boost gauge piping blah blah when i picked it up after these upgrades, she dyno'ed 319rwhp at ~19psi. Fun ride for sure. It hit the point where it's traction limited. I like to get to know a car leaving it at 10-15psi boost. I put a bunch miles on it at once (road trip). The next day it wouldn't even idle. I noticed that the FPR had backed out and a plugged hose coming off of the BOV had come unplugged. I replugged and tweaked FPR until the car idles. car runs like total crap, feels like a go-kart briggs/straton motor missing, and backfiring. white smoke. then I notice fuel dripping from flanges before and after the Cat. Oil smells like fuel. Oil level higher now than when I picked it up. maybe the injectors are staying open, maybe the reflashed ECU is all outta whack. I ordered a wideband O2 sensor and a fuel computer (the XFC from powertraincontrolsolutions). i ordered these as tuning tools, but I think I gots' more problems than tuning. should I pull out the plugs and look for gas soaked plugs? Should I pull the fuel rail and see if the injectors are pulsing as they should? ^^ i just read some of those tips by searching, but I dunno know what to do first. Last edited by malofquist; 09-04-2006 at 03:38 PM..

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09-04-2006, 03:28 PM	#2
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	god damn that sucks.. umm.. basically double check all the fundamentals. Make sure everything is tight and secure.. all vac lines are in place.. couldn't hurt to check your plugs.. I hate to suggest it.. but if your oil smells like fuel.. bad rings comes to mind. Especially with the smoke. Check compression. __________________

09-04-2006, 05:27 PM	#3
malofquist Join Date: Sep 2006 Location: McLean, VA Posts: 22 Trader Rating: (1) Feedback Score: 1 reviews	^^ pic of the blackest plug. (#-whatever, closest to the firewall) the rest aren't too bad. a little shiny and black. I put each one near ground and they do fire. i woulda guessed two not firing at all the way she's running

09-10-2006, 12:41 PM	#4
malofquist Join Date: Sep 2006 Location: McLean, VA Posts: 22 Trader Rating: (1) Feedback Score: 1 reviews	wow, so many helpful people on this forum. thank you for all of your support and advice!! anyway, it was an injector front seal is all. cylinder #2's 550cc injector was pouring fuel regarless of crank angle, etc. I thought I'd post the solution so it'd come up in someone's searches.