KA Dies after warming up - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

LA_phantom_240 · 06-10-2008, 08:54 PM

In the last stages of project "Get this fucking s13 running already, goddamnit!", we finally have my friend's s13 running on all four cylinders (Gasp!) with no fuel leaks (Double gasp!)... but when he starts it, it idles at 1500rpm until it comes up to operating temp, at which point the idle drops to about 500 and dies shortly after. What should we look for?

dori_sil8t · 06-10-2008, 08:57 PM

coolant temp sensor.(ect) also O2 sensor. check them out

LA_phantom_240 · 06-10-2008, 08:59 PM

O2 sensor is brand new. Coolant temp sensor may be an issue... what about the TPS needing adjustment? Its only slightly off, but off nonetheless.

**Phlip** · 06-10-2008, 09:01 PM

Idle Air Control Valve as well

projectRDM · 06-10-2008, 09:31 PM

CTS for the win.

UNISA JECS · 06-10-2008, 09:41 PM

Did you set base idle and timing correctly? Sounds like once the IACV-Air Regulator closes the IACV-AAC valve isn't allowing enough air threw to maintain idle either because it is stuck closed and or the idle air control screw is improperly set.

LA_phantom_240 · 06-10-2008, 09:52 PM

Hmmm..... I gotta make sure that the IACV's vacuum hose is hooked up right. I have a feeling he capped it off by accident when we got rid of all the emissions devices lol.

KA-T_240 · 06-10-2008, 09:59 PM

Unplug MAF and start car and see if problem goes away.

Then make sure the IACV is hooked up, and all that. Then seafoam it.

LA_phantom_240 · 06-11-2008, 06:34 AM

Quote:

Originally Posted by KA-T_240

Unplug MAF and start car and see if problem goes away.

Then make sure the IACV is hooked up, and all that. Then seafoam it.

Motor is freshly rebuilt. MAF was bad when we got the motor back, so we got another. It will rev past 2500 so its not bad.

g6civcx · 06-11-2008, 08:28 AM

Maybe not relevant to your problem, but if this were a Honda, I would immediately suspect the fuel injection relay. The relay fails when it gets warm.

If you've tried and nothing else makes sense, perhaps check your relays?

LA_phantom_240 · 06-11-2008, 11:28 AM

The car will stay running if you give it some gas, but won't idle on its own.

renegade_ewok · 06-11-2008, 11:35 AM

Quote:

Originally Posted by LA_phantom_240

The car will stay running if you give it some gas, but won't idle on its own.

Definitely check the all the valves in the IAC system. If you open the throttle body it won't matter how much or how little air the idle valves let through since you are bypassing.

LA_phantom_240 · 06-11-2008, 11:42 AM

Yeah, that's what I'm thinking.

06-10-2008, 08:57 PM	#2
dori_sil8t Zilvia Junkie Join Date: Sep 2007 Location: Ontario Age: 42 Posts: 385 Trader Rating: (0) Feedback Score: 0 reviews	coolant temp sensor.(ect) also O2 sensor. check them out __________________ unionautoclub.com

06-10-2008, 09:01 PM	#4
Phlip Yes, I look like that Join Date: Mar 2002 Location: In my supervillain's lair Posts: 27,980 Trader Rating: (19) Rides Gallery: Phlip Feedback Score: 19 reviews	Idle Air Control Valve as well __________________ Weirdo And I write too!

06-10-2008, 09:31 PM	#5
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	CTS for the win. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

06-10-2008, 09:41 PM	#6
UNISA JECS Nissanaholic! Join Date: Feb 2007 Location: Socal Fontana Age: 46 Posts: 2,380 Trader Rating: (40) Feedback Score: 40 reviews	Did you set base idle and timing correctly? Sounds like once the IACV-Air Regulator closes the IACV-AAC valve isn't allowing enough air threw to maintain idle either because it is stuck closed and or the idle air control screw is improperly set. __________________ PARTS 4 SALE !! Z32 E-Brake/Parking Brake Heatshield Assemblys!!! *Rep/Feedbacks*

06-10-2008, 09:59 PM	#8
KA-T_240 Nissanaholic! Join Date: Sep 2005 Location: Moorhead, MN Age: 38 Posts: 1,788 Trader Rating: (0) Feedback Score: 0 reviews	Unplug MAF and start car and see if problem goes away. Then make sure the IACV is hooked up, and all that. Then seafoam it. __________________

06-11-2008, 08:28 AM	#10
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	Maybe not relevant to your problem, but if this were a Honda, I would immediately suspect the fuel injection relay. The relay fails when it gets warm. If you've tried and nothing else makes sense, perhaps check your relays?