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.

Pull the code.

See what the code is

Yea that's my next step. Just woke up lol.

Probably the rear o2 sensor code.

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.

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.

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.

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.