Nissan 370Z Forum - View Single Post - Topgunz

TBatt · 06-22-2016, 09:32 AM

I got my AFR/Boost gauge as well as my oil pressure guages installed last night. Now I can see what is going on with AFR.

I'm having a weird problem with idle and it could be the canned Stillen tune at fault.

With the A/C turned off, I get a hunting idle speed that varies about 1K rpm at times. It will run perfectly smooth and then hunt and then settle back down. The Boost gauge shows close to 30 inches of vacuum. When I turn the A/C on the rpm jumps up to just over 1K and the engine stops hunting at idle. AF ratio at warm idle is 14.4 - 14.6 which looks ok.

This may be stupid on my part but to me it looks like the tune has a problem with idle air flow. I have checked and the BOV is open and air is flowing out of it and I have performed the Idle Air Flow Calibration. That helped a lot but it didn't cure the symptoms.

The engine seems happy everywhere except idle with the A/C turned off. Weird.

Any ideas. The EcuTec tune is scheduled for Saturday, Hopefully that will settle things down.

Any of you that has done the A2A mod have any idle issues while running the canned Stillen tune?

06-22-2016, 09:32 AM	#755 (permalink)
TBatt Track Member Join Date: Apr 2013 Location: Huntsville, AL Posts: 832 Drives: 2019 GT-R Rep Power: 20168	I got my AFR/Boost gauge as well as my oil pressure guages installed last night. Now I can see what is going on with AFR. I'm having a weird problem with idle and it could be the canned Stillen tune at fault. With the A/C turned off, I get a hunting idle speed that varies about 1K rpm at times. It will run perfectly smooth and then hunt and then settle back down. The Boost gauge shows close to 30 inches of vacuum. When I turn the A/C on the rpm jumps up to just over 1K and the engine stops hunting at idle. AF ratio at warm idle is 14.4 - 14.6 which looks ok. This may be stupid on my part but to me it looks like the tune has a problem with idle air flow. I have checked and the BOV is open and air is flowing out of it and I have performed the Idle Air Flow Calibration. That helped a lot but it didn't cure the symptoms. The engine seems happy everywhere except idle with the A/C turned off. Weird. Any ideas. The EcuTec tune is scheduled for Saturday, Hopefully that will settle things down. Any of you that has done the A2A mod have any idle issues while running the canned Stillen tune? __________________ RJM pedal, Hotchkis Sway Bars, FI TDX, FOG Light, Z1 Slotted Drilled rotors, Stillen SC, Quaife ATB, Z1 Oil cooler, AEM Gauge Set, Galeforce gauge mount, Avant Garde M590 Hypersilver w/RE-11, TopgunZ A2A kit., ECUtek tuned by Seb: ROLL TIDE!