Mechanics

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

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
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Elizabethbrooks
September 19, 2012.




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

Saturntech9
Sep 19, 2012.
No I haven't. Is this something we can do ourselves? Could it be a head gasket?

Tiny
Elizabethbrooks
Sep 19, 2012.
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.

Saturntech9
Sep 20, 2012.
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

Tiny
Elizabethbrooks
Sep 20, 2012.
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.

Saturntech9
Sep 20, 2012.
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.

Tiny
Elizabethbrooks
Sep 20, 2012.
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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Saturntech9
Sep 20, 2012.
Yes we have to let up on the gas to get it to shift gears. Would there be engine codes for the CAT showing?

Tiny
Elizabethbrooks
Sep 20, 2012.
A plugged cat usually doesn't set codes sometimes it triggers missfire codes.

Saturntech9
Sep 21, 2012.

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