S14 sr idles like crap then leans out and dies. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

racers4life77 · 02-02-2011, 04:19 PM

S14 sr idles like crap then leans out and dies.
Ok people i despretly need your help to finally get my car on the road.
Like the title says, my sr blacktop idles like crap, when you listen to it
it surge from 3-400 RPM to1100 RPM for a little then dies. When i look at
my wideband it bounces from rich to very lean and dies, then it takes a
sec to crank back up again, but when i check my plug they look like it's
runnig rich. I've checked and rechecked everything i could.
Any help would be appreciated. And yes i've searched the forums
for two weeks. looking for answers. forgot to mention it did this before the tune and mafs.

ECU: tuned by R.S. Enthalpy.
Wiring done by Yuri at Wiring Specialties

My specs:
Car: 1995 Nissan 240
Engine: 1998 S14 SR20DET VTC
Auto to manual swap.

Rocker Arm Stoppers
Valvesprings
Downpipe
Front Mount Intercooler
HKS: Intake 256 11.5 mm lift Step 2, cam.
Exhaust 264 11.5mm lift Step 2 Cam.
Stock t28
Walbro 255lph fuel pump
3" cat 3" catback exhaust
exhaust manifold
nismo thermostat

List of items checked:

TPS: .45v.
timming: 15*.took off the valve cover and set timmimg per R.S. Enthalpy instructions on site.

New FIVE-O 750cc injectors, o-rings, 2 on the injectors, one on the fuel rail. no leaks.

Gettting fuel and spark. gaps tried, .26 .28 .30 .32 .35 .36 hotter and colder plugs.

New circuit sport fuel rail.

New tial bov: recir.

NO vacum/boost leaks. will check this again today. Boost leak tested.

IACV valve 9.4 ohms, took apart and cleaned, new gasket.

Compression: #1:152, #2:152, #3:153, #4:152.

New Coolant temp sesor.

New walbro pump: even tried hardwiring it.

New throttly body gasket.

Switched to Z32 MAFS after tune. Anybody got a spare one i could test with?

New intake manifold gaskets 2.

New vacum hoses and couplers.

NO exhaust leaks.

Coils good tested.

New fpr w/gauge, tested diffrent fuel pressures from 35.5 psi to 45psi .

This is all i can think off right now. Thanks

hsitko · 02-07-2011, 02:29 AM

You didnt by chance delete, i mean "upgrade" your throttle body coolant lines did you? Because if you did then you now know why your car is doing this.

JuMPiiN · 02-07-2011, 02:49 AM

I have the same problem but my car won't even start.... I've done EVERYTHING you've done as well been through about 7 sets of spark plugs.

racers4life77 · 02-10-2011, 12:22 PM

Yes I did but it ran fine without it before.

godzillarb · 02-10-2011, 12:38 PM

You already hit the usual suspects. I'd try another MAF and if that fails, try another ECU.

Edit: The TPS voltage might be fine while it's just sitting there, but did you check the full range of motion? I had similar problems with a car of mine and ended up just being a bad TPS even though static voltage seemed fine.

racers4life77 · 02-16-2011, 07:04 PM

bump..........

02-10-2011, 12:38 PM	#5
godzillarb Zilvia Junkie Join Date: Jun 2005 Location: Destin, FL Age: 35 Posts: 487 Trader Rating: (0) Feedback Score: 0 reviews	You already hit the usual suspects. I'd try another MAF and if that fails, try another ECU. Edit: The TPS voltage might be fine while it's just sitting there, but did you check the full range of motion? I had similar problems with a car of mine and ended up just being a bad TPS even though static voltage seemed fine. __________________ INTENSE POWER RIPPED ME OFF

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02-02-2011, 04:19 PM	#1
racers4life77 Join Date: May 2006 Location: tampa Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	S14 sr idles like crap then leans out and dies. S14 sr idles like crap then leans out and dies. Ok people i despretly need your help to finally get my car on the road. Like the title says, my sr blacktop idles like crap, when you listen to it it surge from 3-400 RPM to1100 RPM for a little then dies. When i look at my wideband it bounces from rich to very lean and dies, then it takes a sec to crank back up again, but when i check my plug they look like it's runnig rich. I've checked and rechecked everything i could. Any help would be appreciated. And yes i've searched the forums for two weeks. looking for answers. forgot to mention it did this before the tune and mafs. ECU: tuned by R.S. Enthalpy. Wiring done by Yuri at Wiring Specialties My specs: Car: 1995 Nissan 240 Engine: 1998 S14 SR20DET VTC Auto to manual swap. Rocker Arm Stoppers Valvesprings Downpipe Front Mount Intercooler HKS: Intake 256 11.5 mm lift Step 2, cam. Exhaust 264 11.5mm lift Step 2 Cam. Stock t28 Walbro 255lph fuel pump 3" cat 3" catback exhaust exhaust manifold nismo thermostat List of items checked: TPS: .45v. timming: 15*.took off the valve cover and set timmimg per R.S. Enthalpy instructions on site. New FIVE-O 750cc injectors, o-rings, 2 on the injectors, one on the fuel rail. no leaks. Gettting fuel and spark. gaps tried, .26 .28 .30 .32 .35 .36 hotter and colder plugs. New circuit sport fuel rail. New tial bov: recir. NO vacum/boost leaks. will check this again today. Boost leak tested. IACV valve 9.4 ohms, took apart and cleaned, new gasket. Compression: #1:152, #2:152, #3:153, #4:152. New Coolant temp sesor. New walbro pump: even tried hardwiring it. New throttly body gasket. Switched to Z32 MAFS after tune. Anybody got a spare one i could test with? New intake manifold gaskets 2. New vacum hoses and couplers. NO exhaust leaks. Coils good tested. New fpr w/gauge, tested diffrent fuel pressures from 35.5 psi to 45psi . This is all i can think off right now. Thanks

02-07-2011, 02:29 AM	#2
hsitko Join Date: Jul 2010 Location: wa Posts: 45 Trader Rating: (1) Feedback Score: 1 reviews	You didnt by chance delete, i mean "upgrade" your throttle body coolant lines did you? Because if you did then you now know why your car is doing this.

02-07-2011, 02:49 AM	#3
JuMPiiN Zilvia Junkie Join Date: Sep 2010 Location: Bossier City, LA Age: 30 Posts: 393 Trader Rating: (4) Feedback Score: 4 reviews	I have the same problem but my car won't even start.... I've done EVERYTHING you've done as well been through about 7 sets of spark plugs.

02-10-2011, 12:22 PM	#4
racers4life77 Join Date: May 2006 Location: tampa Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	Yes I did but it ran fine without it before.

02-16-2011, 07:04 PM	#6
racers4life77 Join Date: May 2006 Location: tampa Posts: 24 Trader Rating: (0) Feedback Score: 0 reviews	bump..........