s14 sr idle/ spitting problem. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Destructodc74 · 11-30-2009, 04:09 PM

okay so i have a s14 sr and im trying to get it running smoothly. im pretty sure i have a vaccuum leak somewhere or one isnt hooked up correctly. when im idling the boost gauge reads zero but as soon as i give it a little gas it drops into vacuumm until i accelerate into boost. there are two little vaccuum ports coming out of the intake manifold right under the throttle body that are plugged and i was wondering if anyone knew if they should be or what? im running no blow off valve currently with a front mount setup and the idle jumps around like crazy and sometimes stalls. im also running a z32 maf which is hooked up in my cold pipe instead of on the intake. any ideas or does anyone have a vacuum diagram for an s14 sr?

Destructodc74 · 12-01-2009, 11:40 AM

16 views but no help? can anyone tell me what their vacuum is on an s14 sr. i know on my s13 it was like 20 but is it different on an s14 sr?

Destructodc74 · 12-01-2009, 05:08 PM

so i found a major vacuum leak going to the brake booster and fixed it but the car still runs really rough and the idle is bouncin around quite alot. can anyone tell me what the two vacuum ports under the throttle body are for?

HaSo240sx · 12-01-2009, 05:17 PM

On mine one of those goes to my blow off valve and one goes to a boost solenoid but it could because of the z32 maf, have you done a tune on your car.

Destructodc74 · 12-02-2009, 11:31 AM

no tune just yet, i have a safc2 but not a wideband so im not trying to mess with it just yet. also if anyone has a good wideband for sale let me know. where exactly is the boost solenoid?

phase2 · 12-03-2009, 06:28 AM

First of all, boost gauge should not read "0" at idle, it should read vacuum. Trace the boost gauge vacuum hose, you hooked up to the wrong vacuum port on the motor.

2nd, your MAF on cold pipe is setup as a blow through setup. We do not recommend doing this setup you should change back to the old fashion way by putting the maf after the intake and before the turbo for drivability reasons.

3rd, you need to make sure your SAFC has the correct setting for the Z32 MAF's.

Destructodc74 · 12-03-2009, 11:02 AM

thanks for the help. yeah im having trouble hooking up my vacuum hoses on my motor. my s13 sr was hooked up all right but this one obviously isnt and i didnt pay enough attention to how it was. what port should the wastegate be hooked up to? and i have my boost gauge teed off my wastegate vacuum line. is that right? can anyone point me in the right direction of how to properly route the vacuum lines? like i said i have the two vacuum nipples under the throttle body that are both capped off currently.

phase2 · 12-03-2009, 05:08 PM

Boots gauge vacuum hose should not be the same "T" as the wastegate, to be clear you need to take photo of your current hose setup.

11-30-2009, 04:09 PM	#1
Destructodc74 Zilvia Junkie Join Date: Aug 2009 Location: ny Posts: 442 Trader Rating: (7) Feedback Score: 7 reviews	s14 sr idle/ spitting problem. okay so i have a s14 sr and im trying to get it running smoothly. im pretty sure i have a vaccuum leak somewhere or one isnt hooked up correctly. when im idling the boost gauge reads zero but as soon as i give it a little gas it drops into vacuumm until i accelerate into boost. there are two little vaccuum ports coming out of the intake manifold right under the throttle body that are plugged and i was wondering if anyone knew if they should be or what? im running no blow off valve currently with a front mount setup and the idle jumps around like crazy and sometimes stalls. im also running a z32 maf which is hooked up in my cold pipe instead of on the intake. any ideas or does anyone have a vacuum diagram for an s14 sr?

12-03-2009, 06:28 AM	#6
phase2 Zilvia.net Advertiser Join Date: Jun 2002 Location: Walnut, CA 91789 Posts: 380 Trader Rating: (3) Feedback Score: 3 reviews	First of all, boost gauge should not read "0" at idle, it should read vacuum. Trace the boost gauge vacuum hose, you hooked up to the wrong vacuum port on the motor. 2nd, your MAF on cold pipe is setup as a blow through setup. We do not recommend doing this setup you should change back to the old fashion way by putting the maf after the intake and before the turbo for drivability reasons. 3rd, you need to make sure your SAFC has the correct setting for the Z32 MAF's. __________________ 909-594-3619 Business Hours: Mon-Fri 10am-6pm (Pacific) email: [email protected] http://www.phase2motortrend.com

12-03-2009, 05:08 PM	#8
phase2 Zilvia.net Advertiser Join Date: Jun 2002 Location: Walnut, CA 91789 Posts: 380 Trader Rating: (3) Feedback Score: 3 reviews	Boots gauge vacuum hose should not be the same "T" as the wastegate, to be clear you need to take photo of your current hose setup. __________________ 909-594-3619 Business Hours: Mon-Fri 10am-6pm (Pacific) email: [email protected] http://www.phase2motortrend.com

12-01-2009, 11:40 AM	#2
Destructodc74 Zilvia Junkie Join Date: Aug 2009 Location: ny Posts: 442 Trader Rating: (7) Feedback Score: 7 reviews	16 views but no help? can anyone tell me what their vacuum is on an s14 sr. i know on my s13 it was like 20 but is it different on an s14 sr?

12-01-2009, 05:08 PM	#3
Destructodc74 Zilvia Junkie Join Date: Aug 2009 Location: ny Posts: 442 Trader Rating: (7) Feedback Score: 7 reviews	so i found a major vacuum leak going to the brake booster and fixed it but the car still runs really rough and the idle is bouncin around quite alot. can anyone tell me what the two vacuum ports under the throttle body are for?

12-01-2009, 05:17 PM	#4
HaSo240sx Leaky Injector Join Date: Apr 2009 Location: Knoxville, Tn Age: 35 Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	On mine one of those goes to my blow off valve and one goes to a boost solenoid but it could because of the z32 maf, have you done a tune on your car.

12-02-2009, 11:31 AM	#5
Destructodc74 Zilvia Junkie Join Date: Aug 2009 Location: ny Posts: 442 Trader Rating: (7) Feedback Score: 7 reviews	no tune just yet, i have a safc2 but not a wideband so im not trying to mess with it just yet. also if anyone has a good wideband for sale let me know. where exactly is the boost solenoid?

12-03-2009, 11:02 AM	#7
Destructodc74 Zilvia Junkie Join Date: Aug 2009 Location: ny Posts: 442 Trader Rating: (7) Feedback Score: 7 reviews	thanks for the help. yeah im having trouble hooking up my vacuum hoses on my motor. my s13 sr was hooked up all right but this one obviously isnt and i didnt pay enough attention to how it was. what port should the wastegate be hooked up to? and i have my boost gauge teed off my wastegate vacuum line. is that right? can anyone point me in the right direction of how to properly route the vacuum lines? like i said i have the two vacuum nipples under the throttle body that are both capped off currently.