I have a 93 Dakota LE 3.9L 2wd. The previous owned installed a cherry bomb true dual exhaust without a cat. I noticed the O2 sensor wire is just hanging there not installed on this exhaust.

1) Now that's it's true dual system can I install two sensors to one wire?
2) Can the computer adjust for two sensor readings?
3) Would it be even worth installing one sensor? One is better than none, I suppose.

Please keep in mind this is my daily driver that only gets eleven miles per gallon.

 

I would stay with the single O2 Sensor setup. If you don't have a place for the sensor you'll need a O2 sensor bung. Run it closer to the exhaust manifold. 2wd 3.9 that only gets 11 MPG is pretty bad. With it being canceled out it sounds like it's going into rich mode.

 

It definitely is it rich mode you can smell it while it's idling. I did get a couple of O2 sensor bungs, the auto parts store also suggested if I still was getting bad gas mileage after the install try replacing the Idle Air Control Motor sensor and the Manifold Absolute Pressure sensor. I did just replace the EGR valve 3 months ago.

 

1) No.
2) No.
3) Yes. Your running rich because you don't have at least one sensor. With a duel system, one is better than none. The only problem is if you have a problem on the other bank the computer won't be able to pick it up.

The Idle Air Control Motor is a motor, not a sensor. It controls your idle, nothing else. It has nothing to do with mileage.

I doubt your MAP sensor is bad. The truck would run like absolute dog s**t if it was bad if it would run at all. Start with the O2 sensor. Get a Mopar O2 sensor. I've had problems with other brands lasting as long as a Mopar sensor. I think NTK makes them for Chrysler. So if you can't get a Mopar than get a NTK. Stay away from Bosch. They make a good wide band O2 sensor but their narrow bands don't last. At least for me they don't in my turbo mini-van.

A.J.

 

not quite. because the exhaust is routed per engine bank the intake manifold distribution is such that (on a V6) one side of TB feeds the middle cylinder on one side and teh 2 end ones on the other and vise versa. so yeah it should be able to pick up a problem just like it did with the single exhaust.

My son's Ramcharger (89) has the O2 right in the dump of the ex manifold itself on the driver side; where our Dakotas have them close to the "butt of the 'y'" which would give some exh from each side exposure to the sensor... so I dont think it will matter which bank you take the reading from. Find an easily accessible spot out of the way of road hazards as close to the manifold as you can

 

Not on a MPI manifold. The only problem an O2 sensor is going to pick up is an air/fuel ratio problem. So if the O2 is in the right bank exhaust and you have a problem with a left bank injector, the computer won't pick it up.

A.J.