Hey all, I just realized that every time I reset the ecu, my car idles a LOT better. Then over time, the idle gets very rough, and lately has been stalling a lot. I have a ported and milled head on my automatic eclipse, and it's always had a rough idle since the head work. But why does the idle get worse over time, and every time I reset the ECU, its almost a perfect idle? Could it be my downstream o2 sensor (which I haven't had in for over a year)? My idle was fine with no downstream o2 before the head work though...any ideas?

eclipse804@hotmail.com
http://www.importvenom.com
Import Venom - Parts and Performance

Yeah you could have a bad O2 sensor.

The ECU adjusts fuel etc. over time to new conditions and sets trim values. Maybe the ECU doesn't really know how to deal with the new set up all that well.

Hell you could always wire in a switch to kill the memory power to the ECU and clear it every so often if performance and idle is better with the base programmed fuel curves.

"The fastest draw is when the sword never leaves the scabbard,
The strongest way to block, is never to provoke a blow,
And the cleanest cut is the one withheld."

Michael J. Kulaga e-mail: Michael_97RS@2gntDSM.zzn.com
aol IM: MJKulga Website: http://highlander.dsmpower.com/

All Motor Beast in the Making

Injen CAI, 55mm TB, Hooker 4-1 Stepped Header, GS-T Muffler, AFX UDP, S-AFC, 8.5mm Magnecor Wires, SS Clutch Line, NRG Susp. Motor Mount Ins., FU/RU/RL STBs, TSW Blade 17x7.5, Bridgestone Potenza RE730 215/45ZR-17. Front KVR Cross-Drilled Rotors and Carbon Fiber Pads

To Be Installed: Rear disc brake conversion kit, SS Brake Lines, Rear KVR Cross Drilled Rotors and KVR Carbon Fiber Kevlar Pads

Hmm so maybe my upstream o2 is bad also huh? I notice it responds a lot slower now, and sometimes shows 0 bars when cruising without the gas pedal down. It still displays rich when at WOT, but during normal driving, it doesn't move that much. What do you guys think of buying used OEM o2 sensors for 45 bucks each?

eclipse804@hotmail.com
http://www.importvenom.com
Import Venom - Parts and Performance

Check your MAP sensor. Make sure its not going over 4.79v

Can you tell me what the MAP sensor looks like, or where it is? I assume I need a voltmeter to check it right?

eclipse804@hotmail.com
http://www.importvenom.com
Import Venom - Parts and Performance

>What do you guys think of buying used
>OEM o2 sensors for 45 bucks each?

As posted on:
http://63.99.108.81/dcforum/DCForumID13/2493.html

you can get new NGK o2 sensors for 38 + 5 (s+h) from Nopi.com
so i would presume that new is better than used.


97' Eclipse RS (kinda)
HRC stage III turbo kit (12-18 psi)
HKS 2 1/2" cat back exhaust
16" wheels w/Yokohomo tires (215/45)
420A engine w/ billet crower rods, and 8.5:1 JE pistons
Power-stop brakes w/axis pads
Ebachi Pro lowering kit (1.8")

Yeah, i take vettes, i love these DSM's

Jay-
wakbrd99@aol.com

the map sensor is right beside the intake manifold on the passen side... its black thing with some wires coming out
Michael 99gs-t