S13 SR blacktop [startup problem]? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JRwerks · 06-28-2009, 06:19 PM

So i have a blacktop sr20det has full turbo back exhaust,stock smic,and piping,greddy type r bov,manual boost controller and walbro 255 fuel pump...

This seems to always happen on cold startups or randomly sometimes...
when i go to startup the car it starts and idle/bogs like at 300-450 rpm then dies

i have to start it about 4-5 times sometimes before it starts and idles good! after it starts it runs perfect spools nice everything....

anyone might know what i can do to solve this problem any help will be much appreciated

when it starts i have a vaccum of 18 so seems liike vaccum should be ok..
battery is good.. fuel pump sounds fine..

NISSAN GUY · 06-28-2009, 06:57 PM

have you checked the Fuel pressure regulator?

sometimes if they are getting old they will allow the pressure to not build up and cause a rough start up.

Sileighty_85 · 06-28-2009, 07:02 PM

Check ECU for codes
But sounds like the Coolant Temp Sensor

JRwerks · 06-28-2009, 10:35 PM

i threw on a redtop ecu because mine has no led light and it ran a code 55 which i believe means no error...

and too check the fuel regulator.. how would i check that??

JRwerks · 06-29-2009, 01:51 PM

bumpp... anyone know how i would check my FUEL PRESSURE REGULATOR?

bigcisco62 · 07-02-2009, 01:21 AM

im hving the same problem with my redtop..... idk y its has trouble starting up....

JRwerks · 08-02-2009, 04:05 PM

so i still get problems at cold start ups! the car will turn on and stumble around 400-500 rpms then after about 4-5seconds it shoots up to 1100 and its fine!!

any ideas on what it could be? i knw its suppose to start up right away!!

someone mentioned fuel regulator! how would i check that?

i also have a vaccum of 20 does that matter? isn't suppose to be 18?

thanks in advance

BlackTopS13 · 08-05-2009, 07:40 PM

I don't have all the info as i am just an apprentice, but if your running a stock reg or any vacuum operated unit you can use a vacuum pump and see if it hold vacuum. Also if the fuel rail you are using has a shrader valve on it you can hook up a fuel pressure gauge and watch it at start up. Good luck!

steve shadows · 08-05-2009, 08:01 PM

loosen the IACV screw so your motor can pre-suck some air into the IM to keep it idleing while in it's cold idle session

JRwerks · 08-18-2009, 09:56 AM

so could it be a fuel problem? cause if i hold the gas pedal down and start it it starts!

JRwerks · 02-19-2010, 01:51 PM

found what the problem was just to let everyone know it was that my ignition was getting the 12v it was suppose to be getting which was on pin 36...

so what i did was spliced into the cigarette lighter and hooked it up to that pin and now it starts up every morning beautifully!

06-28-2009, 06:19 PM	#1
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	S13 SR blacktop [startup problem]? So i have a blacktop sr20det has full turbo back exhaust,stock smic,and piping,greddy type r bov,manual boost controller and walbro 255 fuel pump... This seems to always happen on cold startups or randomly sometimes... when i go to startup the car it starts and idle/bogs like at 300-450 rpm then dies i have to start it about 4-5 times sometimes before it starts and idles good! after it starts it runs perfect spools nice everything.... anyone might know what i can do to solve this problem any help will be much appreciated when it starts i have a vaccum of 18 so seems liike vaccum should be ok.. battery is good.. fuel pump sounds fine..

06-28-2009, 07:02 PM	#3
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Check ECU for codes But sounds like the Coolant Temp Sensor __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

08-02-2009, 04:05 PM	#7
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	so i still get problems at cold start ups! the car will turn on and stumble around 400-500 rpms then after about 4-5seconds it shoots up to 1100 and its fine!! any ideas on what it could be? i knw its suppose to start up right away!! someone mentioned fuel regulator! how would i check that? i also have a vaccum of 20 does that matter? isn't suppose to be 18? thanks in advance Last edited by JRwerks; 08-02-2009 at 04:36 PM..

08-05-2009, 08:01 PM	#9
steve shadows Post Whore! Join Date: Aug 2003 Location: LA and OC Posts: 8,202 Trader Rating: (5) Feedback Score: 5 reviews	loosen the IACV screw so your motor can pre-suck some air into the IM to keep it idleing while in it's cold idle session __________________ Like Me on FaceBook !

06-28-2009, 06:57 PM	#2
NISSAN GUY Join Date: Jun 2009 Location: minnesota Age: 37 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	have you checked the Fuel pressure regulator? sometimes if they are getting old they will allow the pressure to not build up and cause a rough start up.

06-28-2009, 10:35 PM	#4
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	i threw on a redtop ecu because mine has no led light and it ran a code 55 which i believe means no error... and too check the fuel regulator.. how would i check that??

06-29-2009, 01:51 PM	#5
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	bumpp... anyone know how i would check my *FUEL PRESSURE REGULATOR*?

07-02-2009, 01:21 AM	#6
bigcisco62 Leaky Injector Join Date: Feb 2009 Location: Oxnard, Cali Age: 36 Posts: 66 Trader Rating: (2) Feedback Score: 2 reviews	im hving the same problem with my redtop..... idk y its has trouble starting up....

08-05-2009, 07:40 PM	#8
BlackTopS13 Join Date: Jun 2009 Location: Vancouver Age: 41 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	I don't have all the info as i am just an apprentice, but if your running a stock reg or any vacuum operated unit you can use a vacuum pump and see if it hold vacuum. Also if the fuel rail you are using has a shrader valve on it you can hook up a fuel pressure gauge and watch it at start up. Good luck!

08-18-2009, 09:56 AM	#10
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	so could it be a fuel problem? cause if i hold the gas pedal down and start it it starts!

02-19-2010, 01:51 PM	#11
JRwerks Zilvia FREAK! Join Date: Mar 2007 Location: SOCAL Posts: 1,200 Trader Rating: (55) Feedback Score: 55 reviews	found what the problem was just to let everyone know it was that my ignition was getting the 12v it was suppose to be getting which was on pin 36... so what i did was spliced into the cigarette lighter and hooked it up to that pin and now it starts up every morning beautifully!