Running LEAN !!HELP!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

juls213 · 12-03-2007, 06:35 PM

Hi guys I have an s14 with a redtop, currently everything is stock except for a t28 turbo upgrade.Here is what is happening. The car starts an idles great but once it goes around 2500 rpm it starts bogging and no power.
-Here is what I checked
Any boost leaks by spraying it with carb cleaner
ignition timing
fuel pressure and fuel pressure regulator
cleaned maf
-I replaced spark plugs

I have hooked up the nissan consult scanner and it says it is running lean. I dont know what to do and I am afraid of ruining my motor. This problem just started on its own. Any ideas?

BTW how can I check MAF??

unicoladron · 12-03-2007, 06:43 PM

you bolted a t28 turbo to an engine that is tuned for a t25. this turbo has the ability to force MOAR air into the engine. now with this larger turbo you've bolted on that can force more air, have you done anything to your fuel system to match the larger volume of air coming into the intake?

this won't fix your problem, but you should definitely have a higher volume fuel pump.

you either need to get an AFC (air/fuel controller) to tune with to tune your a/f ratios, this will allow your engine to run a little more stable.

maybe a cheaper route would be an adjustable FPR, but i'm no tuning expert.

your engine probably idles fine, but once it hits boost, it dies because you're way too lean, because too much air is coming in and not enough fuel.

also do you have a boost gague? if so, do you have a boost controller? what are you currently boosting?

Sileighty_85 · 12-04-2007, 12:21 AM

Quote:

Originally Posted by unicoladron

you bolted a t28 turbo to an engine that is tuned for a t25. this turbo has the ability to force MOAR air into the engine. now with this larger turbo you've bolted on that can force more air, have you done anything to your fuel system to match the larger volume of air coming into the intake?

this won't fix your problem, but you should definitely have a higher volume fuel pump.

you either need to get an AFC (air/fuel controller) to tune with to tune your a/f ratios, this will allow your engine to run a little more stable.

maybe a cheaper route would be an adjustable FPR, but i'm no tuning expert.

your engine probably idles fine, but once it hits boost, it dies because you're way too lean, because too much air is coming in and not enough fuel.

also do you have a boost gague? if so, do you have a boost controller? what are you currently boosting?

Somwhat true but a T-28 wouldnt make it run that bad.
Im running a T-28 on Stock ECU, MAF, and Injectors, @ 1.0Bar DD with no problems for 6 months now.

Sure a Z32 MAF and some 550's with a Tune would be good, But You can DD/ Race a T-28 with out problems, on a Stock SR depending on the condition of everything.

lok · 12-03-2007, 06:51 PM

You have a bad maf prob.

SOCAL240 · 12-03-2007, 07:52 PM

where do u get the nissan consult scanner ? idk really ive never heard of it can anyone explain this to me? thanks

unicoladron · 12-03-2007, 08:00 PM

consult was nissan's pre OBD standard diagnostic tool.

you really don't need it as you can check CELs right on the ECU and you have zilvia to tell you what is wrong with your engine.

i myself am pretty impressed the OP has one.

the only useful information i've found about the CONSULT is here:

http://plmsdevelopments.com/consult_if.shtml

thafriendlypimp · 12-03-2007, 08:43 PM

I like my consult... i got it from a friend FOR FREE! helps a lot... used it for my sentra way back when.

Mister.E · 12-03-2007, 08:48 PM

have you just let the car sit at idle for about 20 minutes? my suby was having this same problem and it turned out to be a malfunctioning O2 sensor.

rlpinoy · 12-03-2007, 08:55 PM

check your maf you might need to upgrade your maf and fuel pump. also you might need to check your fuel filter might be clogged

SOCAL240 · 12-03-2007, 09:16 PM

i know this is offtopic but can someone please answer me this...

there are times when my shift knob bobbles like crazy and the same for my motor .. i foudn out that when i play around with the ignitor it stops ..and then it continues on again...since the ignitor is just hanging im assumin the wires get loose and give me a bad connection causing my car to idle or run like crap....for example it sounds like a subi

thanks for any info u guys might bring to the table :]

SOCAL240 · 12-03-2007, 11:32 PM

Quote:

Originally Posted by SOCAL240

i know this is offtopic but can someone please answer me this...

there are times when my shift knob bobbles like crazy and the same for my motor .. i foudn out that when i play around with the ignitor it stops ..and then it continues on again...since the ignitor is just hanging im assumin the wires get loose and give me a bad connection causing my car to idle or run like crap....for example it sounds like a subi

thanks for any info u guys might bring to the table :]

BUUUMP!! anybody!!?

Sileighty_85 · 12-04-2007, 12:14 AM

Quote:

Originally Posted by SOCAL240

i know this is offtopic but can someone please answer me this...

there are times when my shift knob bobbles like crazy and the same for my motor .. i foudn out that when i play around with the ignitor it stops ..and then it continues on again...since the ignitor is just hanging im assumin the wires get loose and give me a bad connection causing my car to idle or run like crap....for example it sounds like a subi

thanks for any info u guys might bring to the table :]

When its "Bobbling" its more than likely miss-firing, obiliviouly is a wiring issue if you mess with the ignitor chip and stops you got a short or a bad ground, Make sure everything is properly gounded/connected,
Maybe combonation of broken Motor/Tranny Mounts

In this situation it your MAF if it wont go above 2,500RPM's and falling on its face.

Thats a $350+ ignitor chip Id secure that some where before it gets destroyed

juls213 · 12-03-2007, 10:12 PM

See here is the weird part, It was running like a champ before but after leaving it for a couple of days without driving it now I have this problem.

Consult is a very usefull tool that lets u do alot more than just pull codes, I use it cause I work at a dealership.

lok · 12-03-2007, 11:24 PM

The consult says that it is running lean?

What is lean?

Do you have a wideband?

juls213 · 06-01-2008, 07:31 PM

Sorry to bring this thread back from the dead, but I found out whats wrong, not right now, but never post it, future members may find this information useful.

The problem was spark plugs, I bought new NGK and the car is running GREAT!

cotbu · 06-02-2008, 04:22 AM

Wrong! What do you take us as... Idiots? And members if you take anything from this thread take this... If you have problem at 2500rpm check your mafs first!

12-03-2007, 06:35 PM	#1
juls213 Leaky Injector Join Date: Feb 2006 Location: NJ Posts: 95 Trader Rating: (0) Feedback Score: 0 reviews	Running LEAN !!HELP!! Hi guys I have an s14 with a redtop, currently everything is stock except for a t28 turbo upgrade.Here is what is happening. The car starts an idles great but once it goes around 2500 rpm it starts bogging and no power. -Here is what I checked Any boost leaks by spraying it with carb cleaner ignition timing fuel pressure and fuel pressure regulator cleaned maf -I replaced spark plugs I have hooked up the nissan consult scanner and it says it is running lean. I dont know what to do and I am afraid of ruining my motor. This problem just started on its own. Any ideas? BTW how can I check MAF??

12-03-2007, 06:43 PM	#2
unicoladron Zilvia Junkie Join Date: Jul 2007 Location: Long Island, NY Age: 40 Posts: 568 Trader Rating: (0) Feedback Score: 0 reviews	you bolted a t28 turbo to an engine that is tuned for a t25. this turbo has the ability to force MOAR air into the engine. now with this larger turbo you've bolted on that can force more air, have you done anything to your fuel system to match the larger volume of air coming into the intake? this won't fix your problem, but you should definitely have a higher volume fuel pump. you either need to get an AFC (air/fuel controller) to tune with to tune your a/f ratios, this will allow your engine to run a little more stable. maybe a cheaper route would be an adjustable FPR, but i'm no tuning expert. your engine probably idles fine, but once it hits boost, it dies because you're way too lean, because too much air is coming in and not enough fuel. also do you have a boost gague? if so, do you have a boost controller? what are you currently boosting? __________________ 1993 KA24DE for sale with 180k..running when pulled.... need to get rid of ASAP...i'm moving

12-03-2007, 08:00 PM	#6
unicoladron Zilvia Junkie Join Date: Jul 2007 Location: Long Island, NY Age: 40 Posts: 568 Trader Rating: (0) Feedback Score: 0 reviews	consult was nissan's pre OBD standard diagnostic tool. you really don't need it as you can check CELs right on the ECU and you have zilvia to tell you what is wrong with your engine. i myself am pretty impressed the OP has one. the only useful information i've found about the CONSULT is here: http://plmsdevelopments.com/consult_if.shtml __________________ 1993 KA24DE for sale with 180k..running when pulled.... need to get rid of ASAP...i'm moving

12-03-2007, 08:55 PM	#9
rlpinoy Zilvia Member Join Date: Sep 2007 Location: SoCal~Long Beach/Carson~ Posts: 284 Trader Rating: (1) Feedback Score: 1 reviews	check your maf you might need to upgrade your maf and fuel pump. also you might need to check your fuel filter might be clogged __________________ FS Exhaust, Q45 ignitors, & MORE!

06-02-2008, 04:22 AM	#16
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Wrong! What do you take us as... Idiots? And members if you take anything from this thread take this... If you have problem at 2500rpm check your mafs first! __________________ LoverTechnologies "Half Broken Things!"

12-03-2007, 06:51 PM	#4
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	You have a bad maf prob.

12-03-2007, 07:52 PM	#5
SOCAL240 BANNED Join Date: Nov 2007 Location: socal Posts: 123 Trader Rating: (0) Feedback Score: 0 reviews	where do u get the nissan consult scanner ? idk really ive never heard of it can anyone explain this to me? thanks

12-03-2007, 08:43 PM	#7
thafriendlypimp Leaky Injector Join Date: Oct 2007 Location: Duarte, CA Age: 41 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	I like my consult... i got it from a friend FOR FREE! helps a lot... used it for my sentra way back when.

12-03-2007, 08:48 PM	#8
Mister.E Post Whore! Join Date: Oct 2007 Location: Las Vegas Age: 40 Posts: 4,590 Trader Rating: (53) Feedback Score: 53 reviews	have you just let the car sit at idle for about 20 minutes? my suby was having this same problem and it turned out to be a malfunctioning O2 sensor.

12-03-2007, 09:16 PM	#10
SOCAL240 BANNED Join Date: Nov 2007 Location: socal Posts: 123 Trader Rating: (0) Feedback Score: 0 reviews	i know this is offtopic but can someone please answer me this... there are times when my shift knob bobbles like crazy and the same for my motor .. i foudn out that when i play around with the ignitor it stops ..and then it continues on again...since the ignitor is just hanging im assumin the wires get loose and give me a bad connection causing my car to idle or run like crap....for example it sounds like a subi thanks for any info u guys might bring to the table :]

12-03-2007, 10:12 PM	#13
juls213 Leaky Injector Join Date: Feb 2006 Location: NJ Posts: 95 Trader Rating: (0) Feedback Score: 0 reviews	See here is the weird part, It was running like a champ before but after leaving it for a couple of days without driving it now I have this problem. Consult is a very usefull tool that lets u do alot more than just pull codes, I use it cause I work at a dealership.

12-03-2007, 11:24 PM	#14
lok Zilvia Addict Join Date: Jul 2003 Location: Oklahoma Posts: 816 Trader Rating: (10) Feedback Score: 10 reviews	The consult says that it is running lean? What is lean? Do you have a wideband?

06-01-2008, 07:31 PM	#15
juls213 Leaky Injector Join Date: Feb 2006 Location: NJ Posts: 95 Trader Rating: (0) Feedback Score: 0 reviews	Sorry to bring this thread back from the dead, but I found out whats wrong, not right now, but never post it, future members may find this information useful. The problem was spark plugs, I bought new NGK and the car is running GREAT!