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Strange SES problem.

Hay guys. So my Z has been doing good no problems to report until now. Drove her today for about a half hour with no problems then let her sit

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Old 05-20-2012, 12:50 AM   #1 (permalink)
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Default Strange SES problem.

Hay guys. So my Z has been doing good no problems to report until now. Drove her today for about a half hour with no problems then let her sit the rest of the day. At around midnight I started her back up to go for a little drive and noticed that it now had a SES light. I took it for a drive and noticed it was idling at 1k steady. Other then the high idle and light she runs fine. Any ideas before I start messing with it.
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Old 05-20-2012, 01:28 AM   #2 (permalink)
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Pull the code.
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Old 05-20-2012, 02:29 AM   #3 (permalink)
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See what the code is
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Old 05-20-2012, 08:33 AM   #4 (permalink)
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Yea that's my next step. Just woke up lol.
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Old 05-20-2012, 09:04 AM   #5 (permalink)
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Probably the rear o2 sensor code.
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Old 05-20-2012, 09:21 AM   #6 (permalink)
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Was not expecting that. PO300 random multiple misfire twice????? I/M monitors where all ok. Strange. I cleared the code and the car is now idling properly.
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Old 05-21-2012, 10:21 AM   #7 (permalink)
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You are likely running rich, or there is an issue with the o2 sensors.

Couple things that would be helpful to know:

-How long has your car been out from winter storage? Time / miles?
-have your AFR chart from your dyno run? What was the weather like then, vs when you threw the code?

You may also check for a vacuum leak.
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Old 05-21-2012, 10:27 AM   #8 (permalink)
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I would make sure your G3's aren't leaking anywhere as well. If they are, your ECU will be feeding it tons of fuel trying to fix it's self.
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Old 05-21-2012, 10:57 AM   #9 (permalink)
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Car has been out of the garage for about 3 months and I put a little less then 2k miles on it. The temps where probably around the same maybe colder when the car was dynoed, but its been over a year since the dyno was done. As for the vacuum leak and leaking intakes, the car idles normal since I cleared the code. Wouldn't it still idle high if there was a leak of some sort? I drove the car maybe 10-20 miles yesterday so far so good, once the rain stops I will continue driving it to see if the SES light comes back on.


I plan on getting the car dynoed again soon anyway so I can check for proper AFR then.
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