Sluggish under load
#17
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Join Date: May 2015
Location: Mass
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Year: 2001
Model: Cherokee
Engine: 4.0
I think i will try cleaning the cat when i do the exhaust. And i could try that sensor if that fails. But i will poke around with the IR gun before i do that. I belive if the cat in and out temps are different that means its plugged?
#18
CF Veteran
If you don't know the history of the o2 sensors change them out. I've replaced them on 2 vehicles in the past few weeks. The wife's Blazer had issues similar to what you describe. Change 2 upstreams yesterday and solved the problem. Waiting for the other 2 from Rock Auto.
Here's what you need:
upstream- NTK 23151
downstream- NTK 23099
Here's what you need:
upstream- NTK 23151
downstream- NTK 23099
#19
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Join Date: Aug 2010
Location: Canton, MI
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Year: 1999
Model: Cherokee
Engine: 4.0
See if you can get that code again and post it here.
And, while you're at it, check for pending codes.
Using a scanner that shows live data you can see the up & down stream O2S activity. If the Cat is bad it will show up.
#21
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Year: 2001
Model: Cherokee
Engine: 4.0
The fuel pressure held at 50 from the prime all the way to higher rpms. And thanks for the part numbers. Im going away this weekend but when i get back i will post the code
#22
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Year: 2001
Model: Cherokee
Engine: 4.0
So today we put the new muffler on and i noticed peices of the honeycomb material from the cat broken off and sitting inside the muffler. And the engine code is "P0138 o2 sensor high voltage bank 1 sensor 2"
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