Can i get some advice? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Javi802 · 04-16-2016, 07:22 PM

Does anybody have any advice as to what i should look in to, as my car is running lean (idle) on cold starts as well as misfiring. Yet it is idling rich (12-12.4) once its been driven and warmed up. And still misfires a little. Vacuum during the cold start is at -20, but as it starts missing goes as low as -16. And then back to -20.

I set the engine at TDC and performed a boost/vacuum leak test using my air compressor and only found a leak in one of my intercooler couplers, which i fixed

My o2 sensor voltage stays pegged at either high voltage (.86) or low voltage (0) when this happens too.

Cruising around my afrs are fine and my o2 oscillates as it should. I am running lean under wot though. at 10psi and wot im getting roughly 12.7 a/f.

Car has an enthalpy tune and has been having idle issues from the beginning, but at first my afrs under boost were fine. Was getting about 11.6 on my gauge.

Martin is coming to the area next week and said he would find and fix the problem, even if it isnt tune related(which i dont think it is.) But i would much rather fix it myself and just him fine tune it.

04-16-2016, 07:22 PM	#1
Javi802 Zilvia Junkie Join Date: Jul 2012 Location: Oklahoma Age: 33 Posts: 472 Trader Rating: (10) Feedback Score: 10 reviews	Can i get some advice? Does anybody have any advice as to what i should look in to, as my car is running lean (idle) on cold starts as well as misfiring. Yet it is idling rich (12-12.4) once its been driven and warmed up. And still misfires a little. Vacuum during the cold start is at -20, but as it starts missing goes as low as -16. And then back to -20. I set the engine at TDC and performed a boost/vacuum leak test using my air compressor and only found a leak in one of my intercooler couplers, which i fixed My o2 sensor voltage stays pegged at either high voltage (.86) or low voltage (0) when this happens too. Cruising around my afrs are fine and my o2 oscillates as it should. I am running lean under wot though. at 10psi and wot im getting roughly 12.7 a/f. Car has an enthalpy tune and has been having idle issues from the beginning, but at first my afrs under boost were fine. Was getting about 11.6 on my gauge. Martin is coming to the area next week and said he would find and fix the problem, even if it isnt tune related(which i dont think it is.) But i would much rather fix it myself and just him fine tune it.