Subject	If your running a factory tune...........
Posted by	Greg D. (Specialty-Z) on May 06, 2014 at 9:06 PM
	This message has been viewed 543 times.
In Reply To	Well, my 3 NA's are open loop at idle.. I've watched posted by Cjw3 on May 06, 2014 at 08:42 PM
Message	the tune was made for fuel that is no longer available. The 10% ethanol now in the fuel causes the mixture to be out of range for the stock narrow band at idle with the factory tune, so the 02 looks like it is not responding. If you actually look at the fuel table in the program, it is a closed loop cell. When the air fuel is the proper range with good sensors, they do control the idle mixture well. I have worked on these cars every day since they new, the 02 sensors did respond well at idle with the fuel that was available in the 90's with the factory tune. All the NA factory tunes are way off and crazy lean with today's fuel. If you do any mods that allow more flow such as intakes and exhaust,the factory tunes is even farther off. Also when the sensors get old and lasy, they do not respond well at low flow. No problem making a tune for your NA, all are chip tunes use closed loop idle, only time we run idle in open loop is on a custom tune when someone wants a smoother idle than the closed loop idle will allow.
Follow Ups	The most frustrating and elusive idle problem ever - Silens 13:05:58 05/01/14 What kind of intake do you have? Stock, JWT, etc. (n/m) - SirpriZ 15:45:14 05/01/14 Just stock with a filter, no airbox. (n/m) - Silens 16:46:11 05/01/14 Does your set up use a low speed drivability hose? (n/m) - SirpriZ 17:15:32 05/01/14 Not that I'm aware of. - Silens 17:22:57 05/01/14 The problem that I had in mind would only occur if you have - SirpriZ 17:23:38 05/01/14 nope, I wish lol. - Silens 17:45:10 05/01/14 Sounds like either the throttle plates are too far closed, - Greg D. (Specialty-Z) 18:16:48 05/01/14 Re: Sounds like either the throttle plates are too far closed, - Silens 12:04:15 05/02/14 PCV system ok? (n/m) - BarryGZX 19:25:37 05/01/14 Re: PCV system ok? - Silens 12:04:51 05/02/14 You say Wideband.. Only One? - Cjw3 11:53:39 05/02/14 Re: You say Wideband.. Only One? - Silens 12:06:58 05/02/14 Re: Re: You say Wideband.. Only One? - Cjw3 12:38:19 05/02/14 you should check your narrow bands - Zvil (FL) 00:38:26 05/03/14 Re: you should check your narrow bands - Cjw3 08:34:38 05/03/14 stock 02 sensors are used during closed loop only = idle (n/m) - The Devils Z 19:42:23 05/03/14 Re: stock 02 sensors are used during closed loop only = idle - Cjw3 23:13:17 05/03/14 you may be right -- it get it backwords - but they are only - The Devils Z 11:25:39 05/04/14 I believe initial start up until prescribed temp is open - SirpriZ 15:32:06 05/04/14 Idle is ALWAYS in Open Loop.. Read the Book (n/m) - Cjw3 16:39:08 05/04/14 my Z must have an abnormal quirk then - Zvil (FL) 16:52:50 05/05/14 "idle" is when the ECU sets the ignition timing at 15 - Cjw3 19:36:24 05/05/14 Depends on the tune....... - Greg D. (Specialty-Z) 17:48:12 05/06/14 Well, my 3 NA's are open loop at idle.. I've watched - Cjw3 20:42:14 05/06/14 If your running a factory tune........... - Greg D. (Specialty-Z) 21:06:03 05/06/14 mind = blown...I bow to the sensei :) (n/m) - Zvil (FL) 22:07:08 05/06/14 Very Nice.. - Cjw3 23:33:32 05/06/14 Look inside for post and u-tube by customer showing idle.... - Greg D. (Specialty-Z) 13:54:43 05/07/14
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