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im currently getting a horrible 8 mpg in my 93 rodeo v6, my o2 sensor was trashed when i got it.. so i replaced that my mpg went up around 17 and then slowly tapered down to 8 does anyone know first off what would damage the o2 sensor that quickly.. if thats the problem, and secondly i went in to get a diagnostic test and we couldnt find the connector.. does anyone have a clue where that could be located.. any info would be great

Bruce
 

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I have a 94 Trooper and I don't get gas mileage that is nearly that bad. I'd change the o2 sensor, unless you know that it was changed recently. The factory interval is 90k miles. I noticed that my gas mileage went up about 1mpg when I changed mine - and I didn't have horrible gas mileage. Obviously how you drive can effect it as well. Try driving as calm as you can for a tank and see how far you get. I'm not sure that I could make the low gas like come on in 150 miles, no matter how wild I drove mine though. I'm closer to 300 before the light comes on in mine. I guess that's about 17-18mpg, and I spend half of my time at 35mph, half at 80mph.

Some BG injector cleaner wouldn't hurt either. While you are in maint mode, the rear diff fluid probably hasn't been changed in a long time, and you could check the brake fluid and power steering fluid as well.

Other things to check: you are firing on all cyls? The 92-95.5 3.2 engines seem to have a habbit of causing their spark plug wires arc through the insulation after some time, but this is usually noticable in the way the engine runs.

You don't have an OBDII connector on your 94. You have a connecter near the console that will let you view any stored engine trouble codes. You connect pins one and three together with a short piece of wire. You'll find more than one connecter under there, but the one you want only has 3 pins, and it isn't connected to anything.

-Tad
 

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Loosegoose- IIRC, your 3-prong diagnostic connector is under the driverside kick panel (near the dead-pedal). You jump pins 1 & 3 & count the flashes of the "check engine light" with the key "on". Dont feel too bad about your fuel mileage. My 2002 rodeo tops out at about 19mpg under ideal conditions. More like 17-18mpg for a typical tank full. They are heavey, non-aerodynamic trucks with alot of drivetrain to drag around, especially with out front hubs to unlock :cry: .
G/luck
Joel
 

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Is your '93 totally stock? How does it run? 8mpg is so bad for a stock rodeo, that I'ts gotta be puffing black smoke & running like [email protected]! The only thing that I know of besides age/mileage that will trash an oxygen sensor (on contact) is any type of silicone based lubes/sprays. A funky O2 sensor wont necessarily set off a CEL, especially on the older OBDI system like yours, it may be causing your engine to continuously run in a rich mode. Make sure your air filter & intake are clean & keep your tires aired to door jamb specs. Running with the a/c on will knock a MPG or 2 off as well.
G/luck
Joel
 
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