WHAT WOULD CAUSE A LOSS OF POWER AND FLASHING CHCEK ENGINE LIGHT

  • Tiny
  • elizabethbrooks
  • 2003 Jeep Liberty
  • 118,000 miles

I have a 2003 Jeep Libert 3.7l V6. Saturday the thermostat went out. We had it replaced and we told that the radiator had a leak but was holding pressure- we opted to not replace it yet. Yesterday my husband was driving it and the check engine light was flashing- he had power loss couldn't go faster then 40mph. I'm wondering if these two things are related or seperate? Engine codes are p0300, p0303, p0304, p0305

Wednesday, September 19th, 2012 AT 10:03 PM

9 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,251 posts

I would say seperate have you had the exhaust checked for excessive back pressure?

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Wednesday, September 19th, 2012 AT 10:40 PM
  • Tiny
  • elizabethbrooks
  • Member

No I haven't. Is this something we can do ourselves? Could it be a head gasket?

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Wednesday, September 19th, 2012 AT 11:24 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,251 posts

The bad engine miss fire and only being able to go 40 with a big loss of power?Makes me think plugged cat. Its best to take it to a exhaust shop to have the back pressure done or you will have to buy a back. Pressure tester and learn how to use it.

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Thursday, September 20th, 2012 AT 12:02 AM
  • Tiny
  • elizabethbrooks
  • Member

Would it be OK to drive to the shop? Any ideas what I'm looking at as far as costs go? I'm relieved to know u don't think its a head gasket

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Thursday, September 20th, 2012 AT 12:46 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,251 posts

How does it run now?It doesnt blow out white smoke out the tail pipe while running does it?As far as cost it all depends if it is a plugged cat an how much they cost.

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Thursday, September 20th, 2012 AT 12:58 AM
  • Tiny
  • elizabethbrooks
  • Member

No white smoke but once it warms up the engine kinda stalls feels like its going to die at any second. But it runs OK when it first starts.

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Thursday, September 20th, 2012 AT 1:07 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,251 posts

Alright so it acts up when hot?Usually when the cat gets clogged thats usually what happens.I would have the back pressure checked. Also when its acting up do you ever have to let up on the gas for it to shift up to the next higher gear.

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Thursday, September 20th, 2012 AT 1:18 AM
  • Tiny
  • elizabethbrooks
  • Member

Yes we have to let up on the gas to get it to shift gears. Would there be engine codes for the CAT showing?

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Thursday, September 20th, 2012 AT 5:25 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,251 posts

A plugged cat usually doesn't set codes sometimes it triggers missfire codes.

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Friday, September 21st, 2012 AT 2:42 AM

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