Where is the oxygen sensor for a 91 Astro AWD Van?
I know that one of them is located on the exhaust manifold, between the point where the left and right exhaust manifolds merge and the catalytic converter. But I am not sure if there is a second one.
1990-2005 Chevy Astro weighs 3897lbs The previous post above is from Adeyfk. I own a 1990 Chevy Astro AWD Van. AWD Vans weigh more. I called the Chevy Dealership and gave them my vin # and was told the gross weight was very close to 6,000 lbs. and one other web site said the same. Not all vans weigh the same. Some of the older models had extended back ends and/or heavier AWD frames.
It depends on what model van. G10 1/2 ton van had either a 4.3L, a 5.0L, or a 5.7L engine. G20 3/4 ton van had either a 4.3L, a 5.0L, a 5.7L or a 6.2L diesel. a G30 1 ton van had either a 4.3l, a 5.0L, a 5.7L, a 6.2L diesel, or a 7.4L. An Astro Van 2WD had either a 2.5L or a 4.3L. An Astro Van AWD had a 4.3L.
Astro mileage My 1996 Astro AWD 6 cyl gets about 9.5 in the city and 13-15 on the highway. Pretty bad! It has new feet so maybe mileage will improve. You should get 20+ mpg on the high-way(50mph,80kph). If not then its probably the winter gas which always results in 10-15% lower mileage. Otherwise its time for a tuneup and new O2 sensor or new catalytic.
I have a 1997 Astro and there are actually three (3) oxygen sensors on it. One on each down tube of the Y before the catalytic converter and one between the catalytic converter and the muffler back toward the rear axle. The one the driver's side Y isn't bad to change. The one on the passenger side is impossible and the one to the rear is tough as well.