wet plugs, running rich. need another brain, been staring at car too long - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

pewpew · 04-05-2013, 03:50 AM

Okay here is my issue:
s13 sr20det
Car is running rich. soaks spark plugs, car wont start.
fuel pressure is at 40lbs (a little low, normally runs 42lbs, but we were trying to lean it out some, just to see if it would help)
when I pull plugs, I am getting spark.
740cc injectors don't leak and have a good conical spray pattern
temperature is 12 C
new o2 sensor
new-er temperature gauges
tps is reading the correct ohms
timing is top dead center, stabbed CAS 3 different times, followed FRsports guide
timing reads 0 degrees at IG on/not running, 3 degrees at cranking
injectors read 5-7% duty at cranking
MAF is reading 450-700 mV at cranking

only sensor that i havent checked is knock.
recently went from 2.5inch IC pipes to 3inch

car started this morning, revved awesome, rough-ish idle
now car wont start at all. cranks, but no fire.

jr_ss · 04-05-2013, 06:58 AM

Do you have a tune to run those 750's?

pewpew · 04-05-2013, 07:44 AM

yessir, powerfc, tuned professionally.

zerodameaon · 04-05-2013, 12:49 PM

What kind of mods do you have to support those injectors? You still can't just slap them on a stock SR and expect a tune to keep them in check. Just for the hell of it try smaller injectors and see if your problem is alleviated some.

army240 · 04-05-2013, 02:45 PM

Did you check your injectors O-Rings for leak?

pewpew · 04-05-2013, 03:09 PM

i have had the 740s since 2008, it ran perfect before. just completed an engine bay tuck/paint.
powerFC 414BN014
to4e
272 BC cams, springs, retainers
FMIC w/3" piping
walbro pump
nismo fpr

pewpew · 04-05-2013, 03:39 PM

ill check o-rings shortly.

keep the ideas coming =/

KiLLeR2001 · 04-05-2013, 05:05 PM

Tell me the resistance of the ECU temperature sensor when the car is completely cooled down.

army240 · 04-05-2013, 06:16 PM

Quote:

Originally Posted by KiLLeR2001

Tell me the resistance of the ECU temperature sensor when the car is completely cooled down.

Just to specify to the OP it's the one with 2 wires on it

Also, you could check the temperature on your power FC.

pewpew · 04-05-2013, 07:23 PM

checking...

pewpew · 04-05-2013, 08:03 PM

3.45v at cold

pewpew · 04-05-2013, 08:13 PM

it is 61 F here currently

KiLLeR2001 · 04-05-2013, 08:20 PM

Stock SR is 43psi with vacuum unplugged and 37psi with vacumm plugged in.

Also, timing needs to be set to 15* BTDC. If you're running at TDC than that will cause a rich condition.

*fliprayzin240sx* · 04-06-2013, 12:22 PM

Also, double check to make sure your PFC didnt drop the settings. Make sure your injector settings are still in there.

shift_down · 04-08-2013, 09:17 AM

Quote:

Originally Posted by army240

Did you check your injectors O-Rings for leak?

This.

Happened to me. You need to pull injectors and check first. Once you figure out the problem, you MUST change the oil or you will spin a bearing.

04-05-2013, 03:50 AM	#1
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	wet plugs, running rich. need another brain, been staring at car too long Okay here is my issue: s13 sr20det Car is running rich. soaks spark plugs, car wont start. fuel pressure is at 40lbs (a little low, normally runs 42lbs, but we were trying to lean it out some, just to see if it would help) when I pull plugs, I am getting spark. 740cc injectors don't leak and have a good conical spray pattern temperature is 12 C new o2 sensor new-er temperature gauges tps is reading the correct ohms timing is top dead center, stabbed CAS 3 different times, followed FRsports guide timing reads 0 degrees at IG on/not running, 3 degrees at cranking injectors read 5-7% duty at cranking MAF is reading 450-700 mV at cranking only sensor that i havent checked is knock. recently went from 2.5inch IC pipes to 3inch car started this morning, revved awesome, rough-ish idle now car wont start at all. cranks, but no fire. __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 06:58 AM	#2
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,052 Trader Rating: (34) Feedback Score: 34 reviews	Do you have a tune to run those 750's? __________________ My SR20VET

04-05-2013, 07:44 AM	#3
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	yessir, powerfc, tuned professionally. __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 02:45 PM	#5
army240 Zilvia Junkie Join Date: May 2008 Location: Quebec Age: 36 Posts: 306 Trader Rating: (1) Feedback Score: 1 reviews	Did you check your injectors O-Rings for leak? __________________ Life is a beat to beat

04-05-2013, 03:09 PM	#6
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	i have had the 740s since 2008, it ran perfect before. just completed an engine bay tuck/paint. powerFC 414BN014 to4e 272 BC cams, springs, retainers FMIC w/3" piping walbro pump nismo fpr __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 03:39 PM	#7
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	ill check o-rings shortly. keep the ideas coming =/ __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 05:05 PM	#8
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	Tell me the resistance of the ECU temperature sensor when the car is completely cooled down. __________________

04-05-2013, 07:23 PM	#10
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	checking... __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 08:03 PM	#11
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	3.45v at cold __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 08:13 PM	#12
pewpew Leaky Injector Join Date: Aug 2008 Location: salina, ks Age: 39 Posts: 83 Trader Rating: (5) Feedback Score: 5 reviews	it is 61 F here currently __________________ Don't mix booze and car batteries...it gets expensive, quickly.

04-05-2013, 08:20 PM	#13
KiLLeR2001 Post Whore! Join Date: Jun 2007 Location: オーランドフロリダ Posts: 7,955 Trader Rating: (46) Feedback Score: 46 reviews	Stock SR is 43psi with vacuum unplugged and 37psi with vacumm plugged in. Also, timing needs to be set to 15* BTDC. If you're running at TDC than that will cause a rich condition. __________________

04-06-2013, 12:22 PM	#14
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Also, double check to make sure your PFC didnt drop the settings. Make sure your injector settings are still in there. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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