I'm lost - need suggestions

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07-20-2016, 05:55 AM

#16

BlueRidgeMark

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Join Date: May 2012

Location: Lost in the wilds of Virginia

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Year: 1998 Classic (I'll get it running soon....) and 02 Grand

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by minikee

According to the VIN, it's federal emissions.

Then it should have TWO sensors, not four.

Quote:

Originally Posted by minikee

The picture above is the type of exhaust the jeep had originally. I can see where the upstream o2 sensors (directly under the intake) were removed and the holes plugged. Where the manifold to cat flanges are, the cats have been removed and a straight pipe has been welded on each one, merging into 1 pipe and proceeding down into a single cat next to the tranny. So it's set up like a 1999 exhaust but was originally a 2000. It looks like figure 33 above but has o2 sensor holes that have been plugged.

So for this setup, it would have had the 4 o2 sensors. But now it only has 2 because someone modified it.

Maybe the original exhaust was bad, and someone replaced it with a modified Cali exhaust to make it compatible with your computer. Might have been available cheaply, or maybe the only thing that was available if it was living in California at the time.

The important thing is, you have e federal emissions vehicle with the correct number of sensors.

Maybe the