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Old 10-26-2008, 11:40 PM   #4
Schrade
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Re: How do I change the Oxygen Sensor? /94 3.4L v6...

Quote:
Originally Posted by sad-lumina-owner
It appears to be as difficult to reach the O2 sensor/wires for testing as it is to replace it.

As near as I can tell, the O2 sensor is on top of a part of the exhaust manifold pipe coming out the back of the manifold and very close to the engine block, perhaps about as high as 'mid-engine'.

To change the spark plugs on the backside of this engine normally requires you detach the engine from its mounts and lift/tilt it forward (or back?).

I got around this assininity by sawing holes in the firewall/engine compartment body, so that I could get a socket wrench on the back 3 plugs.

This obviously won't work for the O2 sensor. I think once again I'm supposed to actually disconnect the engine mounts and lift the engine in order to get at the 02 sensor. What Aholes the GM designers were here.

I guess I'm going to have to learn how to pry up the motor without doing too much damage, to get my hand in behind the engine from the top.

Any experiences/suggestions are appreciated.
Yikes!!! What a stinker! Yup - you can figger out pretty quick, that the guys who design them ain't the ones who gotta' get a wrench-on.

Still seems the best way is to pull the exhaust, and the cat, since it's got fouling too, and while you're at it, you can feel around in the cat with a BIG LONG screwdriver, and ream around in it real good and see if it's all in there tight, until it's all loose and falling out.

Just make sure to not ream around in it more than 30 minutes or so and let it all fall out, since it's illegal to spend too much time reamin' around in it and improve gas mileage by doin' so
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