Losing power and won't rev

[Meanjoegreenjeep]

04 Jeep Wrangler 4.0 5 speed manual. It's losing power in all gears and 5th gear it won't rev and won't go above 44 mph. Any ideas on what it could be?


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[mark sr]

How many miles are on it? When was it tuned up last? A plugged catalytic converter can cause those symptoms.

 

[TerryMason]

Is it throwing any codes?

 

[Meanjoegreenjeep]

It's got 166,xxx miles. It was throwing an o2 sensor code and I replaced it but it didn't help


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[superj]

I am guessing cat or muffler is clogged up. how warmed up is it when it does this? when you start the jeep, go feel how the exhaust is coming out the pipe, then when it starts running out of power, go feel how much is coming out. listen to it also. when you start it, it is probably pretty mellow and smooth. if it sounds forced and faster when the jeep is losing power, it is for sure a plugged cat or muffler.

 

[TerryMason]

I think mark may be on the money here. Let us know which O2 code your getting.

I believe that you have 4 O2 sensors, 2 upstream and 2 downstream. The downstream sensors are responsible for monitoring the health of your cat.

 

[Meanjoegreenjeep]

It was the rear downstream


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[TerryMason]

It was the rear downstream


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Post the exact code if you get a chance. There are a few codes that can popup.

 

[Meanjoegreenjeep]

The code was PO432


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[TerryMason]

P0432 - Catalytic converter efficiency

 

[Meanjoegreenjeep]

Got it changed and the problems fixed. Thanks guys!


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[JPNinPA]

Give it time before thinking it's fixed.


JPNinPA
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