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Old 06-29-2013, 06:34 PM
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Question Out of ideas

Okay, I have a 2001 TJ that has multiple problems all of which I believe are related, I'm just not sure how.

No air conditioning.
Boil over into radiator reservoir.
CEL error P301.

Recent repairs / changes:
New water pump
New steel radiator
Replaced spark plugs
New ignition rail
New fuel injector cylinder 1
New oxygen sensors
New throttle body spacer
New AirRaid intake

I am the original owner. Bought it brand new off the lot. The Jeep is a 2001 Wrangler Sahara with about 160,000 miles on it. It has a 4" lift, 33x12.5 tires, 15" steel wheels, 4.10 gears and a freshly rebuilt rear diff, slip yoke eliminator kit and new rear drive shaft. The problem started with overheating. Water pump and radiator were shot. replaced both and over heating stopped but now I have the issues noted above. I've read that the boil over into the reservoir is an indication of a blown head gasket. I get no smoke at all on start up or while running. The temp sits at 210 rock steady. The water does not have oil in it that I can tell nor does it smell like anything but water. Oil pressure varies but when warm and under load it sits on the right edge of the zero of 40. The radiator cap has a 16 imprinted on it. The p301 error comes up occasionally. It's not a consistent error. I can clear the codes then drive for two days or two weeks, then the engine will stumble slightly and the error will come back. No other error codes come up. Just that one. I got one of those AC refill kits and it shows that the AC is full and doesn't need recharging (it's never been recharged)

I'm at a loss of what to do next.

Any suggestions?

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Old 06-29-2013, 07:06 PM   #2
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Originally Posted by SadisticMedic View Post

Any suggestions?

Thermostat upside down?

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Old 06-29-2013, 07:06 PM   #3
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The boil over could just be a weak radiator cap. I would try replacing it first. if that doesn't help the next step would be have the coolant tested for exhaust gas to see if it is a head gasket or cracked head problem. That would probably explain the misfire also.
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Old 07-03-2013, 08:31 PM   #4
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Originally Posted by Full Spool View Post
Thermostat upside down?
I've replaced mine recently and it only fit one way.
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Old 07-03-2013, 08:57 PM   #5
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Your only hope is that you have some wiring chafing near the drivers side rear of the valve cover causing the misfire code or maybe a crank sensor/connector that's going bad.

Blown head gasket and/or cracked head would be my guess.. The a/c problem is probably a coincidence. Regardless of what anyone says... 160,000 miles is a lot of wear and tear.

Buy another tj with low miles.. Swap over whatever goodies you want to keep. Then dump that nightmare for cheap and move on
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Old 07-03-2013, 09:01 PM   #6
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Two words. Stroker motor.
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Old 07-03-2013, 09:09 PM   #7
Mostly old school..!

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Could also be a radiator hose collapsing on you or a bad thermostat.
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Old 07-04-2013, 09:06 AM   #8
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If I recall radiator cap is supposed to be 18#.
Replace anyway as that stopped myboil over issue on my 01. Only a few bucks.

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