sr20det cold starts - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

pyshin · 09-15-2009, 02:47 AM

Yes, I have searched and havn't found much help.

I have a redtop sr20det in my '89 hatch and it has horrible cold starts. The battery and ground are fine. The starter has no problem turning the engine over. The engine starts up no problem when warm. I believe it may be a problem with fuel delivery, but I really don't know. If you guys have any input I'd appreciate it. Thanks

skylindrftr · 09-15-2009, 03:04 AM

have you tried petting it =P

*fliprayzin240sx* · 09-15-2009, 06:28 AM

Define bad cold start? Like having a hard time cranking over when its cold?!?! Do you have to gas it to start it, and keep gassing it till it gets somewhat warm???

*GSXRJJordan* · 09-15-2009, 06:33 AM

Did you do the wiring yourself?

Theres an orange wire/silver stripe that connects to the dash harness (small white rectangular plug) that a lot of people don't hook up. It gives the ECU +12V on that pin when the engine's cranking, so it dumps fuel into every injector instead of just one, helping the engine 'catch'.

FRSport's S13 SR into S13 writeup covers it well, with pics.

pyshin · 09-15-2009, 10:15 AM

Quote:

Originally Posted by fliprayzin240sx

Define bad cold start? Like having a hard time cranking over when its cold?!?! Do you have to gas it to start it, and keep gassing it till it gets somewhat warm???

It doesn't have a hard time cranking when cold; and I don't have to keep it gassed, just idles at a higher rpm when cold.

Quote:

Originally Posted by GSXRJJordan

Did you do the wiring yourself?

Theres an orange wire/silver stripe that connects to the dash harness (small white rectangular plug) that a lot of people don't hook up. It gives the ECU +12V on that pin when the engine's cranking, so it dumps fuel into every injector instead of just one, helping the engine 'catch'.

FRSport's S13 SR into S13 writeup covers it well, with pics.

No I didn't, my car came with the swap complete

Thanks, I'll look into that and update the thread later

HAWAII · 09-15-2009, 02:29 PM

wait.. bro, are you saying that it just IDLES HIGH when engine is cold?!?!

Does not have a problem starting when cold.

Does not have a problem starting when warm.

Just IDLES HIGH when cold.

my next question, does the HIGH idle go down after a couple of minutes when the engine gets warm?

pyshin · 09-15-2009, 02:40 PM

Quote:

Originally Posted by HAWAII

wait.. bro, are you saying that it just IDLES HIGH when engine is cold?!?!

Does not have a problem starting when cold.

Does not have a problem starting when warm.

Just IDLES HIGH when cold.

my next question, does the HIGH idle go down after a couple of minutes when the engine gets warm?

No, it does have a problem starting when cold AND idles high as engines usually do when cold.

It has no problem starting when warm.

Yes, the idle goes down to around 750-775 rpm when warm.

skylindrftr · 09-15-2009, 03:27 PM

How high is the idle cold? I saw it at like 2k, but i think you were gassing it? Usually the car just idles high until it warms up Peter.

pyshin · 09-15-2009, 03:29 PM

Quote:

Originally Posted by skylindrftr

How high is the idle cold? I saw it at like 2k, but i think you were gassing it? Usually the car just idles high until it warms up Peter.

Around 1300. I know it idles high when warming up.. That's not the problem Avery. Haha

skylindrftr · 09-16-2009, 02:45 AM

Lol okay, did you check the wiring thing the other guys were talking about?

*GSXRJJordan* · 09-16-2009, 04:24 AM

Quote:

Originally Posted by pyshin

Around 1300. I know it idles high when warming up.. That's not the problem Avery. Haha

That actually removes the coolant temp sensor from the list of possible problems. If you want to roll out to my garage in the 626, I can diagnose it for ya, and fix it if needed in less than an hour.

PM me if you need more help than the FRsport guide gives.

skylindrftr · 09-16-2009, 07:56 PM

Give it a shot if you can't do it yourself peter, jeff is legit =)

skylindrftr · 09-17-2009, 01:38 AM

sig test, sorry peterrrrrrrrrrrrrrr

pyshin · 09-17-2009, 01:39 AM

Quote:

Originally Posted by skylindrftr

sig test, sorry peterrrrrrrrrrrrrrr

How many times do you need to test it lmfao

pyshin · 09-17-2009, 02:16 AM

Cold starts have been fixed. Used Chevron Techron fuel system cleaner and now it's fine. Must've just been dirty injectors

pyshin · 10-13-2009, 06:00 PM

Cold starts are back. Any suggestions?

extra20 · 10-15-2009, 05:44 PM

check ur FPR on few occasions debris can lodge in diaphram and cause fuel pressure to drop when parked for a few hrs or usually overnight. so the engine will act similar to a lawn mower when it runs out of gas surge then dies. in ur case it s pressure up then stabilizes.

extra20 · 10-15-2009, 05:48 PM

disconnect the vacuum line to FPR and see if theres fuel in it should be dry.

pyshin · 10-15-2009, 07:44 PM

Quote:

Originally Posted by extra20

disconnect the vacuum line to FPR and see if theres fuel in it should be dry.

Just checked, it's dry.. Dammit haha

jspaeth · 10-15-2009, 08:40 PM

Quote:

Originally Posted by extra20

check ur FPR on few occasions debris can lodge in diaphram and cause fuel pressure to drop when parked for a few hrs or usually overnight. so the engine will act similar to a lawn mower when it runs out of gas surge then dies. in ur case it s pressure up then stabilizes.

This is the first time I've heard this, and might be the reason why sometimes my f.p. is down a few psi every once and a while when I start the car.

But how could anything get into the FPR? If you have a well-functioning fuel filter, how can anything large enough to "lodge" in the diaphragm get in there in the first place....?

pyshin · 10-15-2009, 10:04 PM

Quote:

Originally Posted by jspaeth

This is the first time I've heard this, and might be the reason why sometimes my f.p. is down a few psi every once and a while when I start the car.

But how could anything get into the FPR? If you have a well-functioning fuel filter, how can anything large enough to "lodge" in the diaphragm get in there in the first place....?

No idea. Also changed my Z32 fuel filter the other day..

09-15-2009, 02:47 AM	#1
pyshin Zilvia Member Join Date: Jul 2009 Location: Pomona, CA Age: 20 Posts: 235 Trader Rating: (9)	sr20det cold starts Yes, I have searched and havn't found much help. I have a redtop sr20det in my '89 hatch and it has horrible cold starts. The battery and ground are fine. The starter has no problem turning the engine over. The engine starts up no problem when warm. I believe it may be a problem with fuel delivery, but I really don't know. If you guys have any input I'd appreciate it. Thanks __________________ '89 S13 SR20DET

09-15-2009, 06:28 AM	#3
fliprayzin240sx SLINKY + ESCULATOR = Fun Times Join Date: Aug 2002 Location: Ass Crack of Japan Posts: 8,414 Trader Rating: (5) Rides Gallery: fliprayzin240sx	Define bad cold start? Like having a hard time cranking over when its cold?!?! Do you have to gas it to start it, and keep gassing it till it gets somewhat warm??? __________________

09-15-2009, 06:33 AM	#4
GSXRJJordan [JEFE S14] Join Date: May 2006 Location: << 626 >> Posts: 7,177 Trader Rating: (14) Rides Gallery: GSXRJJordan	Did you do the wiring yourself? Theres an orange wire/silver stripe that connects to the dash harness (small white rectangular plug) that a lot of people don't hook up. It gives the ECU +12V on that pin when the engine's cranking, so it dumps fuel into every injector instead of just one, helping the engine 'catch'. FRSport's S13 SR into S13 writeup covers it well, with pics. __________________ TEAM SUSPECT is alive. www.JordanInnovations.com*

09-17-2009, 01:38 AM	#13
skylindrftr Zilvia Addict Join Date: Apr 2007 Location: Socal Age: 20 Posts: 971 Trader Rating: (10)	sig test, sorry peterrrrrrrrrrrrrrr __________________

09-17-2009, 02:16 AM	#15
pyshin Zilvia Member Join Date: Jul 2009 Location: Pomona, CA Age: 20 Posts: 235 Trader Rating: (9)	Cold starts have been fixed. Used Chevron Techron fuel system cleaner and now it's fine. Must've just been dirty injectors __________________ '89 S13 SR20DET

09-15-2009, 03:04 AM	#2
skylindrftr Zilvia Addict Join Date: Apr 2007 Location: Socal Age: 20 Posts: 971 Trader Rating: (10)	have you tried petting it =P

09-15-2009, 02:29 PM	#6
HAWAII Leaky Injector Join Date: Jun 2009 Location: Burbank,Ca Age: 34 Posts: 132 Trader Rating: (5)	wait.. bro, are you saying that it just IDLES HIGH when engine is cold?!?! Does not have a problem starting when cold. Does not have a problem starting when warm. Just IDLES HIGH when cold. my next question, does the HIGH idle go down after a couple of minutes when the engine gets warm?

09-15-2009, 03:27 PM	#8
skylindrftr Zilvia Addict Join Date: Apr 2007 Location: Socal Age: 20 Posts: 971 Trader Rating: (10)	How high is the idle cold? I saw it at like 2k, but i think you were gassing it? Usually the car just idles high until it warms up Peter.

09-16-2009, 02:45 AM	#10
skylindrftr Zilvia Addict Join Date: Apr 2007 Location: Socal Age: 20 Posts: 971 Trader Rating: (10)	Lol okay, did you check the wiring thing the other guys were talking about?

09-16-2009, 07:56 PM	#12
skylindrftr Zilvia Addict Join Date: Apr 2007 Location: Socal Age: 20 Posts: 971 Trader Rating: (10)	Give it a shot if you can't do it yourself peter, jeff is legit =)

10-13-2009, 06:00 PM	#16
pyshin Zilvia Member Join Date: Jul 2009 Location: Pomona, CA Age: 20 Posts: 235 Trader Rating: (9)	Cold starts are back. Any suggestions? __________________ '89 S13 SR20DET

10-15-2009, 05:44 PM	#17
extra20 Join Date: Oct 2009 Location: Socal Posts: 36 Trader Rating: (0)	check ur FPR on few occasions debris can lodge in diaphram and cause fuel pressure to drop when parked for a few hrs or usually overnight. so the engine will act similar to a lawn mower when it runs out of gas surge then dies. in ur case it s pressure up then stabilizes.

10-15-2009, 05:48 PM	#18
extra20 Join Date: Oct 2009 Location: Socal Posts: 36 Trader Rating: (0)	disconnect the vacuum line to FPR and see if theres fuel in it should be dry.

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