Subject	Re: New Theory Regarding Idling Issue.
Posted by	MaxxAction on April 29, 2010 at 4:54 PM
	This message has been viewed 140 times.
In Reply To	New Theory Regarding Idling Issue. posted by MixManMash on April 29, 2010 at 11:15 AM
Message	:I post a while back regarding this idling issue: :[ http://www.twinturbo.net/nissan/300zx/forums/technical/view/1100547/Weird-Idling-Issue.html ] :I haven't had much time to do some further diagnostics since, but when I went to try a few things yesterday I noticed that my Optima Red Top is dead. I think this battery has finally bit the dust as it has been acting up for the last year. :My question is, is it possible that a bad battery has been causing my idling issue? My guess is that it can't hold much of a charge, and probably barely enough to start the car. Now, my theory is that the alternator uses a bit of power from the battery to power the field to generate more electricity. However, if the battery can't power the field very well, then the alternator can't deliver power very well either. At idle, since the alternator isn't spinning that fast, it causes more of a problem. :Does my thinking make sense? No... if the alternator is good, the car will idle and run fine even if the battery is toast. What injectors are you running?
Follow Ups	New Theory Regarding Idling Issue. - MixManMash 11:15:35 04/29/10 No. - ZiNnYc 15:46:51 04/29/10 Well, there isn't red top there any more. Put in a new battery, no difference. - MixManMash 19:55:52 04/29/10 Reason I ask about the AFC is - ZiNnYc 23:44:05 04/29/10 Re: New Theory Regarding Idling Issue. - MaxxAction 16:54:49 04/29/10 Nismo 555s as per my profile. They test out fine as well. (n/m) - MixManMash 19:32:37 04/29/10 Re: New Theory Regarding Idling Issue. - canyoncarver 19:39:57 04/29/10 The thing is, that it performs fine. just doesn't want to idle well, especially - MixManMash 19:47:27 04/29/10 does your mulitmeter show ~14v across the battery - canyoncarver 21:22:13 04/29/10 Yup. 14.4V now. (n/m) - MixManMash 23:26:59 04/29/10 Update: - MixManMash 23:41:54 04/29/10 Did you install the EPROM? - ZiNnYc 23:46:26 04/29/10 Yes, I have tried a different EEPROM. no difference. - MixManMash 08:19:47 04/30/10 I don't understand why you think a small boost leak - canyoncarver 06:46:29 04/30/10 Because it's the same small boost leak I had last year when the car was running fine. And it's in a - MixManMash 08:22:21 04/30/10 While you are right in that it's probably not due to a minor - ZiNnYc 09:31:25 04/30/10 It's in such a bad place, that the amount of labour it would - MixManMash 11:48:47 04/30/10 Re: It's in such a bad place, that the amount of labour it would - canyoncarver 14:14:25 04/30/10 Passenger side intake valve cover. It picked up some - MixManMash 16:41:15 04/30/10 Well, is it your DD? Sounds like an afternoon to me. (n/m) - ZiNnYc 17:25:11 04/30/10 Not my DD. But with all the effort it would take to pull - MixManMash 01:08:39 05/01/10 lol - ZiNnYc 13:06:09 05/01/10 lol. I'm saying I'd rather put the effort in. Yes it's - MixManMash 13:53:58 05/01/10 things to do: - ZiNnYc 09:38:54 04/30/10 Did try another ECU with another EPROM. Not difference. - MixManMash 11:46:33 04/30/10 How does it behave with the AAC connector disconnected? - Ashman2k2 12:19:43 04/30/10 I checked the butterfly valves and they are in sync / - MixManMash 16:42:26 04/30/10 Forgot, with the AAC connector disconnected, the idle drops - MixManMash 16:45:02 04/30/10 IMO you should diagnose the issue with the connector - Ashman2k2 17:37:42 04/30/10 Well, not sure if it really is an issue with the connector. - MixManMash 01:12:10 05/01/10 Disconnect the yellow AAC valve connector and set your idle - Gordo 93TT Daytona 19:58:07 05/02/10 Yet another update: - MixManMash 16:21:36 05/01/10 Do you have your recircs? - ZiNnYc 11:37:04 05/02/10 My recircs were shot (goose honk). So I replaced them with - MixManMash 15:20:12 05/02/10 Were your plugs oily or sooty? - canyoncarver 12:20:40 05/02/10 The plugs were sooty, not wet. And there was a smell of - MixManMash 15:19:23 05/02/10 Have you checked fuel preesure and does it hold - canyoncarver 22:27:08 05/02/10 I have checked fuel pressure. It is in spec. My guess with - MixManMash 09:00:40 05/03/10
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