O2 sims
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: O2 sims "and if i'm not mistaken your car will run like crap"
Yes, this is a misconception. Performance will not be effected in anyway when running without rear O2 simms. They just turn off the SES light by fooling the PCM into thinking that there are indeed properly functioning O2 sensors hooked up.
Yes, this is a misconception. Performance will not be effected in anyway when running without rear O2 simms. They just turn off the SES light by fooling the PCM into thinking that there are indeed properly functioning O2 sensors hooked up.
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Teching In
Joined: Aug 2003
Posts: 21
Likes: 0
From: Nova Scotia, Canada
Re: O2 sims My car was running really rich and sluggish. When I installed my O2 sims the car really picked up, the idle sounded different, the rpms were lower at idle. I was running a 11:1 A/F ratio, and that has since leaned out. I know from first hand experience that the car did run like crap w/out sims, I was told it was in a sort of "safe-mode" and I think they were right!
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Re: O2 sims You can run the o2's w/o the cats.
I had no simms w/o cats for a month.
My car is m-6 so it was easy to do the following.
Never let the car idle a steady rpm at idle.
Every 5 seconds just kiss the gas pedal & rev it up a tad.
This will keep it from running the catalyst monitor, which it starts test hot at idle.
The readiness monitor will always read "not ready" but it will not turn on the light.
If you forget & let it idle it will figure it out in a hurry.
I had no simms w/o cats for a month.
My car is m-6 so it was easy to do the following.
Never let the car idle a steady rpm at idle.
Every 5 seconds just kiss the gas pedal & rev it up a tad.
This will keep it from running the catalyst monitor, which it starts test hot at idle.
The readiness monitor will always read "not ready" but it will not turn on the light.
If you forget & let it idle it will figure it out in a hurry.
TECH Regular
Joined: Aug 2002
Posts: 400
Likes: 0
From: New Hampshire
Re: O2 sims
i was told that you can make a o2 simm with a simple resistor setup can any one back that up?
The PCM wants to see avarying voltage. If it seees a steady voltage it will throw the light because it thinks that the sensor is bad and not responding to the varying AFM coming out of the cats.
Additionally, the heater circuit for the O2s needs to be completed, or..... another light.
Gordon
www.provenperformanceconcepts.com
