Little issue at idle..

Chan Chee Hoe · 10-05-2010, 06:38 PM

Quote:

Originally Posted by Pharmacist

is the AC on? Could it be the compressor clutch engaging and disengaging? Or maybe the radiator fan coming on and temporarily taking more electricity from the battery and weakening the ignition? Or maybe it's the electronic throttling system on the car, which does tend to be a bit sluggish and slow to respond.

Cannot be the A/C compressor cutting in,because our engine is a 3.7v6[good torque in idling],not a 1L in line 4.

spearfish25 · 10-05-2010, 08:43 PM

Quote:

Originally Posted by Chan Chee Hoe

Cannot be the A/C compressor cutting in,because our engine is a 3.7v6[good torque in idling],not a 1L in line 4.

Not so sure about that reasoning. Our AC compressor really pulls on the motor. On a hot day, my idle will go from ~700 without AC up to about 900rpm with the AC running. Catch the Z off guard (if you will) and you go from 700rpm to 500rpm...a perceived hiccup.

That being said, I've had the low idle hiccup on hot days with the windows down and AC off.

pty370z · 10-06-2010, 12:37 PM

It happens whether the A/C is on or off.. The effect is less noticeable with the A/C off but it still happens...

Chan Chee Hoe · 10-07-2010, 05:33 AM

Anyway,when we modify the car,we expects the car idling to change,the best is stock if you want the best idling,i remember my friend's Subaru STI,he changes his cams,results is an engine as rough as a diesel at idle.!

6MT · 10-07-2010, 11:59 AM

Quote:

Originally Posted by Chan Chee Hoe

Cannot be the A/C compressor cutting in,because our engine is a 3.7v6[good torque in idling],not a 1L in line 4.

I have to disagree with that. The A/C compressor IS a significant "drag" on the engine when the clutch engages it. It will affect the idle speed momentarily.

10-06-2010, 12:37 PM	#3 (permalink)
pty370z Track Member Join Date: Apr 2009 Location: Panama City, Panama Posts: 654 Drives: over the speed limit Rep Power: 17	It happens whether the A/C is on or off.. The effect is less noticeable with the A/C off but it still happens... __________________ 2010 Solid Red 370Z * *Touring-Sport-6MT Black Interior Performance:** STILLEN * BERK * UR * MISHIMOTO * K&N * Z1 * ZSPEED * UPREV * DBA Interior: GT-R Red Start/Stop Button * MSA Floor Mats * PW:JDM Exterior: INGS+1 * SEIBON * FUJIMURA * PW:JDM * UAM * KICS * VOLK

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10-07-2010, 05:33 AM	#4 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 18	Anyway,when we modify the car,we expects the car idling to change,the best is stock if you want the best idling,i remember my friend's Subaru STI,he changes his cams,results is an engine as rough as a diesel at idle.!