Engine: B20 block, GSR head, Skunk2 manifold, LINK programmable ECU, bolt on turbo kit with 500cc injectors and a GM 3 bar MAP sensor.

The car was just started up yesterday at initial start-up and ran fine at ~2500 RPM for about 20 minutes, when the RPM's were lowered to idle, the engine cut off. Repeated attempts to run the car at idle failed. It will only run at all ranges above idle. All factory sensors are installed (except the oem MAP sensor, and IAB sensor), there seems to be no vacuum leaks, and there are no check engine lights (not sure if the LINK ECU retains factory diagnostics). Does anyone have any ideas?

Thanks


[Modified by b18c1-ek, 11:52 AM 4/16/2002]

 

can you manually manipulate the throttle to keep rpms around 800-1000rpm? Or does it completely die out under a certain rpm? sounds like you've got some tuning issues.. are you sure you're not running too rich with the 500cc injectors? Have you tried manipulating the low-rpm maps in the ecu?

-Xerxes

 

I've gotten the RPM as low as 1100, and it ran fine. TPS indicated ~2% open, but once the throttle is lifted off, the car dies. I am still learning how to use the LINK, and the basic parameters are set, idle = 850 RPM. BTW, I got the ECU unit from TurboT last year.... Yo TurboT, any tuning suggestions? any more ideas are appreciated.

Thanks

 

If the ECU is like the Power FC, It has to "learn" to idle...you do this by manually forcing an idle for about five minutes then lifting off the throttle....don't know about your setup though....could be similar

 

Sounds like the Idle Air Control valve isn't getting a pulse width signal from the ecu.

 

Today, I ran the car down to a steady 800RPM, with no problems whatsoever, but again, once the throttle is completely released, the car dies. I'll try to replace the IACV and see if there's a change....