Help quick with sr20 red top - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Keefs240sx · 05-20-2012, 06:36 PM

Ok I just want to get more opinions on this problem. My car has a jumpy idle I've boost leaked tested an get 15 psi on the gauge an changed temp sensor as well. Motor only has aftermarket external gated an bigger turbo only on 8lb spring an stock injectors

Now when I run it down the road an come to a quick stop engine will idle down then jus die, it will start back up with no problems does it sound like an IACV ?

*wangan_cruiser* · 05-20-2012, 07:35 PM

it should be close to -20 vacuum while sitting idle. you will still boost even though u have an a boost leak.

sdrmiami · 05-20-2012, 07:40 PM

do you have a pic of your setup? where is your airflow meter located? if it is mounted to close to the turbo then when you let off under boost and the turbo back spools it will blow air back out the air flow meter causing it to stall out.. let me know

Keefs240sx · 05-20-2012, 08:06 PM

Maf is about 1ft away from turbo inlet I don't have the filter on the maf waiting on adapter plate , as for Vaccum at idle it reads -20

sdrmiami · 05-20-2012, 08:15 PM

strait pipeor does it have a bend in it?

Keefs240sx · 05-20-2012, 08:19 PM

It's a 45deg elbow on it directed to driverside fender had to run it cause straight piece would hit cas

*wangan_cruiser* · 05-20-2012, 10:34 PM

Check your vacuum routing

AdamR · 05-21-2012, 10:38 AM

Quote:

Originally Posted by sdrmiami

do you have a pic of your setup? where is your airflow meter located? if it is mounted to close to the turbo then when you let off under boost and the turbo back spools it will blow air back out the air flow meter causing it to stall out.. let me know

Explain "back spooling" please.

Keefs240sx · 05-21-2012, 08:49 PM

Any one else have any solutions?

nsfmike240 · 05-21-2012, 09:07 PM

check the level of coolant , if its low the idle will jump up and down

Keefs240sx · 05-22-2012, 12:27 PM

I have its full to top of radiator anything else?

ShadowMan · 05-22-2012, 02:09 PM

My car has a crappy idle too and as no one has really thrown you solutions to check that seem to make a difference. Get some maf cleaner, there is specific spray for mafs. Take out maf, and gently feed the red straw thru the screen and carefully spray off the filliment. Keep the straw an inch or so away from the sensor, also make sure your maf is wired in right too. I still need to check this on mine. But I guess it'll still run with a couple wires switched but rich and shitty. Your vacuum lines as well. are they routed right and not cracked or rotted out. I'm about to order a wiring specialties harness just to rule out a 20 year old rotted, heat soaked wiring nest.

Keefs240sx · 05-22-2012, 04:28 PM

I have the harness too

JDMRIDDAZ · 05-22-2012, 04:47 PM

u need to check voltage to iacv
even if its a premade harness....if the car has voltage fluctuations on any thing to ecu or sensors car will run crappy

Keefs240sx · 05-22-2012, 06:25 PM

Quote:

Originally Posted by JDMRIDDAZ

u need to check voltage to iacv
even if its a premade harness....if the car has voltage fluctuations on any thing to ecu or sensors car will run crappy

What's is the specs/voltage should I have at the iacv?

Keefs240sx · 05-24-2012, 06:14 PM

Still no luck . Help needed

SofaKingFast · 05-24-2012, 06:22 PM

Sounds like you're not re-circulating your BOV?

240zach · 05-24-2012, 06:31 PM

have you tried to run full compressor surge or recirculated bov and see if that stops the low idle? have you ever thought that maybe your bov is leaking?

JapaneseAutox · 05-25-2012, 06:31 AM

What the hell is up with everyone's grammar in this thread? Use god damn punctuation marks.

What other information can you relay upon us about your setup? Are you still running the stock ecu or is it a stand alone with someone else's tune? Did you build the engine or did you buy it from someone else? It may have aftermarket cams in it throwing off the idle and tune (this happened to me before). I wouldn't recommend driving anywhere without the filter unless you want to kill your engine. Be patient and wait for your adapter. Your problems sound like a boost leak to me. Go to your local hardware store and fabricate a boost leak tester. Pressurize the system then spray soapy water on all of your couplers and look for bubbles. Couplers can often hold vac but leak boost when the pressure exceeds a certain amount. Check your bov spring. Make sure your maf plug isn't loose. Kill that damn SR gremlin. Good luck.

projectblak · 05-25-2012, 07:49 AM

what kind of BOV are you running, is it recirculated?

05-20-2012, 06:36 PM	#1
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Help quick with sr20 red top Ok I just want to get more opinions on this problem. My car has a jumpy idle I've boost leaked tested an get 15 psi on the gauge an changed temp sensor as well. Motor only has aftermarket external gated an bigger turbo only on 8lb spring an stock injectors Now when I run it down the road an come to a quick stop engine will idle down then jus die, it will start back up with no problems does it sound like an IACV ?

05-20-2012, 07:40 PM	#3
sdrmiami Zilvia Junkie Join Date: Nov 2008 Location: Miami Fl Age: 47 Posts: 518 Trader Rating: (10) Feedback Score: 10 reviews	do you have a pic of your setup? where is your airflow meter located? if it is mounted to close to the turbo then when you let off under boost and the turbo back spools it will blow air back out the air flow meter causing it to stall out.. let me know __________________ Team SDR! 305.992.1514 800hp SR20DET powered 240sx... Full street trim!

05-20-2012, 08:15 PM	#5
sdrmiami Zilvia Junkie Join Date: Nov 2008 Location: Miami Fl Age: 47 Posts: 518 Trader Rating: (10) Feedback Score: 10 reviews	strait pipeor does it have a bend in it? __________________ Team SDR! 305.992.1514 800hp SR20DET powered 240sx... Full street trim!

05-22-2012, 02:09 PM	#12
ShadowMan Zilvia Junkie Join Date: Jul 2011 Location: oceanside, CA. Posts: 538 Trader Rating: (4) Feedback Score: 4 reviews	My car has a crappy idle too and as no one has really thrown you solutions to check that seem to make a difference. Get some maf cleaner, there is specific spray for mafs. Take out maf, and gently feed the red straw thru the screen and carefully spray off the filliment. Keep the straw an inch or so away from the sensor, also make sure your maf is wired in right too. I still need to check this on mine. But I guess it'll still run with a couple wires switched but rich and shitty. Your vacuum lines as well. are they routed right and not cracked or rotted out. I'm about to order a wiring specialties harness just to rule out a 20 year old rotted, heat soaked wiring nest. __________________ in any situation....thou shalt blaze

05-22-2012, 04:47 PM	#14
JDMRIDDAZ Zilvia Junkie Join Date: Sep 2007 Location: ｆォリダ Age: 48 Posts: 440 Trader Rating: (3) Feedback Score: 3 reviews	u need to check voltage to iacv even if its a premade harness....if the car has voltage fluctuations on any thing to ecu or sensors car will run crappy __________________ シチサｎ w/ka20det:in progress シチサｎw/sr20det:stolen

05-20-2012, 07:35 PM	#2
wangan_cruiser kouki man Join Date: Apr 2006 Location: downtown oakland,ca Age: 40 Posts: 3,539 Trader Rating: (36) Feedback Score: 36 reviews	it should be close to -20 vacuum while sitting idle. you will still boost even though u have an a boost leak.

05-20-2012, 08:06 PM	#4
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Maf is about 1ft away from turbo inlet I don't have the filter on the maf waiting on adapter plate , as for Vaccum at idle it reads -20

05-20-2012, 08:19 PM	#6
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	It's a 45deg elbow on it directed to driverside fender had to run it cause straight piece would hit cas

05-20-2012, 10:34 PM	#7
wangan_cruiser kouki man Join Date: Apr 2006 Location: downtown oakland,ca Age: 40 Posts: 3,539 Trader Rating: (36) Feedback Score: 36 reviews	Check your vacuum routing

05-21-2012, 08:49 PM	#9
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Any one else have any solutions?

05-21-2012, 09:07 PM	#10
nsfmike240 Join Date: May 2011 Location: ny Age: 34 Posts: 27 Trader Rating: (1) Feedback Score: 1 reviews	check the level of coolant , if its low the idle will jump up and down

05-22-2012, 12:27 PM	#11
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	I have its full to top of radiator anything else?

05-22-2012, 04:28 PM	#13
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	I have the harness too

05-24-2012, 06:14 PM	#16
Keefs240sx Zilvia Junkie Join Date: Oct 2011 Location: Nc Age: 36 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	Still no luck . Help needed

05-24-2012, 06:22 PM	#17
SofaKingFast Zilvia Addict Join Date: May 2003 Location: Glendale/City of Industry Age: 44 Posts: 605 Trader Rating: (43) Feedback Score: 43 reviews	Sounds like you're not re-circulating your BOV?

05-24-2012, 06:31 PM	#18
240zach Zilvia Addict Join Date: Sep 2010 Location: 916 Posts: 941 Trader Rating: (10) Feedback Score: 10 reviews	have you tried to run full compressor surge or recirculated bov and see if that stops the low idle? have you ever thought that maybe your bov is leaking?

05-25-2012, 06:31 AM	#19
JapaneseAutox Leaky Injector Join Date: Aug 2003 Location: Torrance Ca Posts: 137 Trader Rating: (2) Feedback Score: 2 reviews	What the hell is up with everyone's grammar in this thread? Use god damn punctuation marks. What other information can you relay upon us about your setup? Are you still running the stock ecu or is it a stand alone with someone else's tune? Did you build the engine or did you buy it from someone else? It may have aftermarket cams in it throwing off the idle and tune (this happened to me before). I wouldn't recommend driving anywhere without the filter unless you want to kill your engine. Be patient and wait for your adapter. Your problems sound like a boost leak to me. Go to your local hardware store and fabricate a boost leak tester. Pressurize the system then spray soapy water on all of your couplers and look for bubbles. Couplers can often hold vac but leak boost when the pressure exceeds a certain amount. Check your bov spring. Make sure your maf plug isn't loose. Kill that damn SR gremlin. Good luck.

05-25-2012, 07:49 AM	#20
projectblak Zilvia Member Join Date: Jul 2011 Location: louisville ky Age: 37 Posts: 297 Trader Rating: (5) Feedback Score: 5 reviews	what kind of BOV are you running, is it recirculated?