I have a 1991 Dodge Ram D-150 that I just put new exhaust on. I put Holley Headers, Dnyomax H-pipe Muffler, and 2 1/4 Dual Piping. I had to take my O2 Senor off, and now my truck is acting funny. When I'm sitting at a light or stoped just sitting there it runs fine, but when I start driving thats when the truck starts acting funny. The only way it clears it up is to front it, after I let off the gas it try to stall out. Does anyone know how to bypass the O2 Senor? http://www.cardomain.com/ride/2214774 this is my truck.

 

Why did you take your o2 sensor off? [&:] Put it BACK IN ASAP. The reason it's running bad is because the motor is running VERY rich (and wasting gas). Your truck NEEDS the sensor to run correctly. It can't figure out proper fuel trim without it.

You can usually buy an o2 bung at an auto parts store. You'll have to have someone weld it into your exhaust. Try and get it as close to the motor as you can after the headers.

 

Yeah, thats what I thought. I was just seeing if anyone knew of a O2 Senor Sim. But said as close to the motor as I can get it.

 

You can't run a simm on the upstream sensor, as the reading/voltage on it changes (that's what the truck uses for fueling).

I'm not sure how well it's going to work in a true dual setup though. I don't have a lot of experience with true duals....don't like em anyway. [:'(]