matthew_129 Posted January 10 Report Share Posted January 10 Hi everyone, I have a G5 in an early Subaru WRX (GC8) i have got it running but the idle is all over the place It seems to want to idle around 2000rpm and tends to hunt a bit with the overrun fuel cut status flicking between active and inactive I am running a rather large throttle body (GM LS1) along with 1000cc injectors on the EJ20 so there is alot of fuel and air getting in, but the TPS is showing just 1% and when i cover the throttle body the engine stalls. I just want to get it running and moving around the workshop while i finish things up before heading off to a tuner and an acceptable idle would be a great start. Tune is attached 20240110 - APQ665 G5 Voodoo 43psi fuel.pcl5 Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 10 Report Share Posted January 10 Probably best to attach a PC log of it idling. How well calibrated is the throttle body position? Have you checked for air leaks? Quote Link to comment Share on other sites More sharing options...
matthew_129 Posted January 11 Author Report Share Posted January 11 Ive been through the calibration process a few times and am pretty confident that ive got it right, i changed the idle speed control > idle actuator > min clamp to 0% which has got the tps now showing 0% but hasnt resulted in much change. I am pretty confident there are no leaks as when i cover the intake it stalls pretty quickly and what i cover it with gets stuck on pretty well. What parameters would you like to see in the log? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 11 Report Share Posted January 11 The reason for a PC Log is so I can see everything, there might not be enough air coming from elsewhere to keep it running but might be enough to make it idle high. Do you still have a factory manifold with a idle controller on it as well? if you remove the intake can you see how far open the actual throttle blade is? Quote Link to comment Share on other sites More sharing options...
matthew_129 Posted January 11 Author Report Share Posted January 11 Yes i understand the reason for the PC log, i want to know what parameters you want me to select to log? It is a custom manifold with no other intakes on it, image attached it visually looks to be fully closed, image attached Quote Link to comment Share on other sites More sharing options...
essb00 Posted January 11 Report Share Posted January 11 How's the airflow on that big auxiliary air valve? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 11 Report Share Posted January 11 Yeah where does that hole go? does it have an adjustment screw somewhere? Quote Link to comment Share on other sites More sharing options...
matthew_129 Posted January 11 Author Report Share Posted January 11 as far as i can tell it only goes to a tube to the right that im guessing would come from a crank case breather or similar, there doesnt seem to be any holes on the inside of the butterfly Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 11 Report Share Posted January 11 Try blocking just it while the engine is running and see if it stalls Quote Link to comment Share on other sites More sharing options...
matthew_129 Posted January 12 Author Report Share Posted January 12 Well turns out it did go somewhere... I've made up a paper gasket to go between the manifold and throttle body that has that blanked off and it now idles around 750 as expected Vaughan 1 Quote Link to comment Share on other sites More sharing options...
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