Subject	if you have an injector that is underflowing
Posted by	aliaZ on April 25, 2012 at 11:23 AM
	This message has been viewed 368 times.
In Reply To	As have I. posted by Woody75 (Denver) on April 25, 2012 at 10:32 AM
Message	it can cause a lean misfire until the pulsewidth is large enough to support combustion. I've also seen leaks under vacuum that don't occur under the pressure of a boost leak check. A leaking injector insulator can cause lean misfire...might try spraying some carb cleaner around the injector insulators to see if idle improves. Did you ohm out the injectors at the injector, or through the ECU harness? While the injector itself may be OK, there may be some corrosion in the harness that causes the resistance to be too high. I've seen injector resistance that is high enough to cause a light load misfire but still perform ok under load
Follow Ups	Stumble at low rpm, kinda stumped. - Woody75 (Denver) 22:43:52 04/24/12 Still have EGR? - Joe@ZSpeedperformance 23:25:02 04/24/12 Tried it, no change. (n/m) - Woody75 (Denver) 22:26:42 04/25/12 Have you tried a different ECU? - toykoz32 01:19:49 04/25/12 Yep, it in my list I posted. (n/m) - Woody75 (Denver) 09:06:48 04/25/12 almost sounds like an open loop vs closed loop issue - aliaZ 06:04:21 04/25/12 Answers. - Woody75 (Denver) 09:11:08 04/25/12 Same.... - 300ZMang 09:03:34 04/25/12 suspect dying injector or bad coil or injector connection - Dane (Houston) 09:59:33 04/25/12 Coils have been proved out. - Woody75 (Denver) 10:32:01 04/25/12 I have seen injectors cause this, even Nismo's that ohmed - marklar182 10:08:56 04/25/12 As have I. - Woody75 (Denver) 10:32:53 04/25/12 if you have an injector that is underflowing - aliaZ 11:23:26 04/25/12 I'm leaning towards this post, and the AR post below. - CoHPhasor 21:43:46 04/25/12 FPC has been swapped out already (orginal post) - Woody75 (Denver) 22:22:51 04/25/12 Right, but how's the voltage? - CoHPhasor 01:53:29 04/26/12 Had this issue for the last 2 months and fixed it 2 days - HK'S Z 12:02:32 04/25/12 Checked it, its good. - Woody75 (Denver) 22:24:45 04/25/12 Suspect VTC gear or oil pressure to VTC (n/m) - OverZealous (CT) 22:55:11 04/26/12 Re: Stumble at low rpm, kinda stumped. - AsaHerring 12:39:31 04/25/12 Was the cas/pin rusted when you pulled it out? - Joe@ZSpeedperformance 08:39:06 04/26/12 Aliaz already asked this. - Woody75 (Denver) 09:09:27 04/26/12 vacuum leak? - TriniTT 10:28:55 04/26/12 What about the TPS sensor? - DVDBURN (MD) 20:43:45 04/26/12 It reads fine. - Woody75 (Denver) 09:26:54 04/27/12 You didn't say anything about the TPS in your OP. (n/m) - DVDBURN (MD) 10:08:06 04/27/12 Oh damn, sorry. Just saw that. (n/m) - Woody75 (Denver) 10:15:38 04/27/12 Sounds like sensor or fuel delivery. - DVDBURN (MD) 10:54:55 04/27/12 Few updates - Woody75 (Denver) 22:32:41 04/27/12 I had a PTU go bad before where it caused - KongZTT GT28RS MD 22:52:58 04/27/12 "Swapped out PTU" (from original post) - Woody75 (Denver) 11:45:49 04/28/12 sorry.. didnt read it thoroughly :) - KongZTT GT28RS MD 12:54:59 04/28/12 Couple thoughts for you - 300ZMang 08:38:17 04/30/12
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