Z-286speed

So, i have a new 233/239 which ran great from lubbock down to houston. Here is what is different with my car, i have no front 02s on the drive, so i went under and put some 02s in. The car was fine in open loop, but once hit closed loop, idle drops down to 400-500 range not wanting to run. The race has been dyno tuned and only started this after the 02 install. I have reset the pcm and everything, so what could this be? It runs fine once moving around 1500rpms, so the first thing i can put this on is the computer.

jrp

iTrader: (16)

well is it still tuned for open loop?

Tech

iTrader: (1)

If it was tuned for open loop (assuming MAF is fairly stock) it should run fine with everything hooked back up if it's an 01-02. If it's not 01-02, then the tuner is a jackass for not copying over the secondary stuff to the primary.

Z-286speed

The MAF is stock. The car ran just fine from lubbock down to houston, 600 miles, went to 900 idle speed when the clutch was put in. But now its not doing that, its drops almost to 0 then bumps up to 400 or so. This was not happening before without the front 02s, then i tried putting in the front 02s and all hell broke lose, i took them out, pulled the PCM fuse and restarted, and ideas?

Z-286speed

Its also a 99, and the tunner was a sponser. Its seems to be burning tons of gas! I dont know if its looking for the 02 sensors or what.

Z-286speed

I did a search on this, and everyone just pointed fingers at different things. The thing is, the car runs fine once moving above idle speed.

Tech

iTrader: (1)

Unplug the sensors and make sure it's the 02s that are throwing it off. Borrow a scan tool and get some logs with the 02s installed and not installed (unplugged). Even in SD mode, your car will make fueling adjustments based upon 02 sensor feedback. These cars aren't made to run w/o them (if you are using the OEM PCM).

Z-286speed

Thanks for the coment, I will be getting it scanned as soon as possible, but i have to drive back to lubbock tomarrow the way it is.