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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
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
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.