Using O2 Simulators

Meatywand · September 12, 2005

I just ordered a pair of Casper Electronics O2 Simulators from Summit for my 1997 GMC Sierra, with the 5.7 liter 350. Where do they plug in at? Is it up under the hood, or actually down on the exhaust? It looks like they go under the hood near the computer or wiring harness or something like that. If anyone has any experiance I could really use the help Thanks!

REKIII · September 12, 2005

I just ordered a pair of Casper Electronics O2 Simulators from Summit for my 1997 GMC Sierra, with the 5.7 liter 350. Where do they plug in at? Is it up under the hood, or actually down on the exhaust? It looks like they go under the hood near the computer or wiring harness or something like that. If anyone has any experiance I could really use the help Thanks!

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Never put simulators on my Chevy truck yet, but on my other cars, you plug the O2 sensor bung and plug the simulator into where the sensor used to plug into, then you mount the simulator somewhere that it can get some air because they do get hot.

Bob

facn8me · September 12, 2005

May I ask why you bought them?

Meatywand · September 12, 2005

I have true duals and one of my two cats got clogged, but I really don't feel like shelling out 400 bucks to replace them, so I'm just going to gut them and use the O2 simulators to keep the check engine light from coming on

redvett · September 13, 2005

Hope hope you have lots of money for gas. They are designed for offroad racing not driving on the street.

facn8me · September 13, 2005

Well ya got them for the right reason so think about it. If you are removing the cat. and it effects the o2's they(it) hook up after the convetor. Replacing the 02 sensor.

Meatywand · September 13, 2005

I bought these so I don't have to shell out a bunch of money on gas, they tell the computer everything is running right, so it doesn't freak out. I figured it out, you just hook it into the computer where the end of the O2 sensor is and leave the o2 sensor plugged into the pipe

Rookie · September 13, 2005

The simulators plud right in to where the rear O2 sensors plug into the harness. if you still have the o2 sensors in the truck leave them and use them to plug the holes. I would then trim the wire of the sensors. You then just plug in the simulators to where the o2 wires would have gone. I would also suggest zip tie around them so they dont hang down.

These work good for what your doing they will stop the rear o2 from throwing a light.

redvett · September 13, 2005

The sims will set A/F at about 11-1 to 12-1 and best A/F for economy is 14-1. The o2 sensers & cat are designed to give you the best fuel economy performance and still let us breath fresh air when driven everyday. 11-1 or 12-1 A/F will also cause loading up and frequent plug changes and washing down the cylinders causing shorter engine life.

mudbug660 · September 13, 2005

I thought the rear O2 sensors are used to make sure the cats are working properly and the front O2's are for the A/F.?

redvett · September 13, 2005

I thought the rear O2 sensors are used to make sure the cats are working properly and the front O2's are for the A/F.?

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Both are for A/F rear complement the front. Unless you are off road racing your best to go stock your not going to save much money long term.

Meatywand · September 14, 2005

not to sound like a dick, but I contacted Casper Electronics, and the only time the ECU will adjust the A/F ratio because of the rear O2 sensor is if the rear O2 sensor is sending it a messed up code or reading. THe sims make it look like everything is functioning properly, therefore the ECU continues to remain unaffected by the changes to the Cats

redvett · September 14, 2005

Why cant you just put on a new cat and be done with it. We all can breath better.

Meatywand · September 15, 2005

I don't like them, and I would rather spend 80 bucks and an hour of time guttig them than the 200+ for two decent high flows

Butch 02 Denali · September 15, 2005

The rear 02 sensors have no engine control functions, strictly monotoring. They are there to monitor cat efficiency, but if they set a code, it will affect engine operation. The front 02's monitor the AF ratio and send the info to the PCM.

The sims will work fine. Another option is to turn off the rear 02's with a custom tune.