O2 Sensor or MAP Sensor

Hi All,

I've done some searching around the forum, and I see alot of guys have the same problem I do- my '87 Cherokee (235K miles) gets lousy mileage, with alot of soot coming out the tailpipe. Most everyone who had answers about this on the forum believed the engine is running rich and to replace the O2 sensor.

Can anyone give me any pointers for doing this? I did a search on o2 sensors on the forum and came up with alot of stuff, but didn't see anything specific about how to replace one. :(

What year is it? The O2 sensor(s) are located in the exhaust manifold, or downpipe, upstream from the CAT. It has a connector on it. Simply disconnect, use a wrench to loosen it (it shouldn't be too tight) and it screws out. Use some Anit-Sieze on the threads of the new one.

Depending on your year, you may have more than 1.

Its an '87. Sounds easy enought to do, any idea how much a new sensor costs?

Couldn't be simpler. The sensor is on the end of the exhaust manifold, just before the connection to the downpipe. Get to it from underneath.

A good Bosch OEM (includes the stock connector) is about $50. "Universal" ones are about $30. I'd recommend the OEM.

Get a small package of anti-sieze. Put a thin layer around the threads. Be careful not to get any on the tip of the sensor. Just a "snug" on teh sensor to tighten (or you can search the torque spec).

BTW: DUH!! You said '87 but I just read right past it. ;)

Thanks Saudade! :>)