Running really rich and bad idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

str33tpr3p · 07-29-2012, 10:16 AM

Ever since i put in my walbro fuel pump my car has been running extremly rich which makes sense with the fuel pump but any way to maybe lean it out a bit, i was thinking replace the o2 sensor but not sure if its going to change much. On start up its running about 10.1 and when driving it is always between 10.5-10.0, as well as on start up its shooting out carbon out the pipe.

Also the idling problem, when i turn car on even in normal weather the idle goes to about 1.5 than drops to .5 and jumps in between for a few minutes before it evens out, i have replaced my spark plugs, cleaned my idle air control and im running out of ideas so if you have any feed back please let me know.

Thanks , also the engine is a s14 blacktop.

snags · 07-29-2012, 10:20 AM

alot of people are just going to tell you to get an adjustable FPR. cheap and works

TwelveAM · 07-31-2012, 01:53 PM

Have you replaced the injectors?

Tedskiii · 07-31-2012, 02:10 PM

I had the same problem as you, except I don't have my Walbro in. My first start of the day would be sucky, and the idle would drop and raise until it warmed up.

I would check the vac hose going from your fpr to your intake manifold .. Mine was dry rotted, when I replaced the line it got somewhat better, along with an idle adjust because my idle was pretty low anyways.

I still need to recirculate my BOV, and change my brake booster lines so I won't die when coming to a stop.

Not sure if any of this will help you, just a suggestion.

I'm still alittle shady about installing my Walbro because of this.

!Zar! · 07-31-2012, 02:47 PM

Quote:

Originally Posted by snags

alot of people are just going to tell you to get an adjustable FPR. cheap and works

Fuel pump doesn't change your fuel pressure. If it does, your fuel pressure regulator is fucked.

OP: Check your timing?

S14Lee · 07-31-2012, 02:59 PM

The next time when your car idles bad touch the wiring on the maf plug to see if it smooths out or dies out. I had the same problem with idling for over a while and everyone keeps telling me I had a boost leak because I was also running rich but come to find out the wiring to my maf was bad order a new plug from wiring specialities and had it installed and all my problems are gone. Try that it worked for me

Croustibat · 08-01-2012, 01:52 AM

dead FPR would create a lean situation.

You just have a boost leak somewhere (and / or a leaking BOV ), so fix that first. Try doing an ECU code check too, it will tell you if your O2 sensor has a problem. If stopping the leak does not stop the rich problem, the most common culprit is the engine temp sensor.

str33tpr3p · 08-02-2012, 06:25 PM

my fpr is ancient its the stock on that came on the car, so after 120xxx km and 16 years it might be that i will check the hose to the intake manifold and my bov doesnt leak and mine is recirced. i will try the maf trick tonight or tomorrow and see how it goes, if not its o2 sensor or boost leak but i have a full new turbo kit thats going in on monday so if i still have the problem after that i will let you guys know, thanks for help

AZ_BOY · 08-02-2012, 07:18 PM

Quote:

Originally Posted by str33tpr3p

my fpr is ancient its the stock on that came on the car, so after 120xxx km and 16 years it might be that i will check the hose to the intake manifold and my bov doesnt leak and mine is recirced. i will try the maf trick tonight or tomorrow and see how it goes, if not its o2 sensor or boost leak but i have a full new turbo kit thats going in on monday so if i still have the problem after that i will let you guys know, thanks for help

Just tune your car.

str33tpr3p · 08-02-2012, 07:40 PM

will be running apexi power fc after turbo so will do as well

AZ_BOY · 08-02-2012, 07:51 PM

Quote:

Originally Posted by str33tpr3p

will be running apexi power fc after turbo so will do as well

Nice

07-29-2012, 10:16 AM	#1
str33tpr3p Leaky Injector Join Date: Apr 2012 Location: canada Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Running really rich and bad idle Ever since i put in my walbro fuel pump my car has been running extremly rich which makes sense with the fuel pump but any way to maybe lean it out a bit, i was thinking replace the o2 sensor but not sure if its going to change much. On start up its running about 10.1 and when driving it is always between 10.5-10.0, as well as on start up its shooting out carbon out the pipe. Also the idling problem, when i turn car on even in normal weather the idle goes to about 1.5 than drops to .5 and jumps in between for a few minutes before it evens out, i have replaced my spark plugs, cleaned my idle air control and im running out of ideas so if you have any feed back please let me know. Thanks , also the engine is a s14 blacktop.

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07-29-2012, 10:20 AM	#2
snags Zilvia Member Join Date: Jan 2012 Location: alberta Age: 31 Posts: 247 Trader Rating: (11) Feedback Score: 11 reviews	alot of people are just going to tell you to get an adjustable FPR. cheap and works

07-31-2012, 01:53 PM	#3
TwelveAM Nissanaholic! Join Date: Feb 2010 Location: SoCal Posts: 1,933 Trader Rating: (26) Feedback Score: 26 reviews	Have you replaced the injectors?

07-31-2012, 02:10 PM	#4
Tedskiii Leaky Injector Join Date: Nov 2011 Location: Hawaii Posts: 83 Trader Rating: (0) Feedback Score: 0 reviews	I had the same problem as you, except I don't have my Walbro in. My first start of the day would be sucky, and the idle would drop and raise until it warmed up. I would check the vac hose going from your fpr to your intake manifold .. Mine was dry rotted, when I replaced the line it got somewhat better, along with an idle adjust because my idle was pretty low anyways. I still need to recirculate my BOV, and change my brake booster lines so I won't die when coming to a stop. Not sure if any of this will help you, just a suggestion. I'm still alittle shady about installing my Walbro because of this.

07-31-2012, 02:59 PM	#6
S14Lee Zilvia Member Join Date: Jun 2011 Location: summerville sc Age: 43 Posts: 160 Trader Rating: (0) Feedback Score: 0 reviews	The next time when your car idles bad touch the wiring on the maf plug to see if it smooths out or dies out. I had the same problem with idling for over a while and everyone keeps telling me I had a boost leak because I was also running rich but come to find out the wiring to my maf was bad order a new plug from wiring specialities and had it installed and all my problems are gone. Try that it worked for me

08-01-2012, 01:52 AM	#7
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 44 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	dead FPR would create a lean situation. You just have a boost leak somewhere (and / or a leaking BOV ), so fix that first. Try doing an ECU code check too, it will tell you if your O2 sensor has a problem. If stopping the leak does not stop the rich problem, the most common culprit is the engine temp sensor.

08-02-2012, 06:25 PM	#8
str33tpr3p Leaky Injector Join Date: Apr 2012 Location: canada Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	my fpr is ancient its the stock on that came on the car, so after 120xxx km and 16 years it might be that i will check the hose to the intake manifold and my bov doesnt leak and mine is recirced. i will try the maf trick tonight or tomorrow and see how it goes, if not its o2 sensor or boost leak but i have a full new turbo kit thats going in on monday so if i still have the problem after that i will let you guys know, thanks for help

08-02-2012, 07:40 PM	#10
str33tpr3p Leaky Injector Join Date: Apr 2012 Location: canada Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	will be running apexi power fc after turbo so will do as well