I want to run a 3in straight pipe exhaust, but can't because of the cat. Does anybody know where I can get a set of simulators, and if they work good and not make the check engine light come on?

 

you just need to put the front o2 sensor in the exhaust near where it is now, and use an o2 sim on the 2nd o2 sensor. this will prevent the CE light.. you don't mention your year so I'm assuming you have 2 o2's. if you have 3 cats then you'll need 2 o2 sims.

 

Sorry, its a 98, and has only 2 sensors. Thanks, do you know where I can get a simulator for the rear sensor?

 

I have replaced my front sensor w/a simulator, left the rear one alone and have yet to get a light. I am not running a cat. Try it first before spending the money.

 

If you run a sim in the front it will NEVER run right!!!! run a front O2 so the 'puter can get your fuel/air ratio correct & put a sim in the rear!!!

 

there was this group buy on simulators, you can see if it's still on... or do a search for them.

 

Thanks, I just found a sim through google. It should be here in a few days, I'll let you know how it goes.

 

I concur - the front O2 sensor tells your computer what the A/F ratio is, so the computer can make adjustments to the mixture. Put a simulator on there and it'll always think it's running right. The rear O2 sensor tells the computer if there has been enough of a change from the front one - if the change isn't good enough then it thinks your cat is bad.

You could just yank the cat out and never get a light. My buddy ran catless up pipe, down pipe, and removed the 3rd cat from his subaru for a while, no CEL at all. A friend of his did the same but added CEL eliminators and he actually got CELs.

 

Ill tell you that my truck runs like a champ. I even called the company to make sure it was supposed to be in that slot. Dont know what the deal is with the cat sensor I do not get a light.

 

Hey Im all f#$%ed up I did put my sim in the correct way just wrote it down wrong.