Please help.....

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Coledurango

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I have an 03 liberty 3.7l that will not run.. Had aP0112 code for iat..I replaced it with no luck..been troubleshooting and found that its reading over 300° is not faulty..I can pull it out of intake and leave plugged up and jeep will start and idle but is rough and iat reading sits around 102°.. if I try to install iat temps jumps above 300 and jeep shuts off.. seems like intake air temp is getting above 300° what could cause this..
 

Conundrum2006

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Are you sure the temperature is correct? My guess would be faulty wiring, maybe wiring is moved as the intake is connected . I'm not sure what the intake could be taking in to hit 300 degrees.

Here is a link for someone trouble shooting a 4.0 wrangler but it should be the same in principal. There may be better advice for libertys .

http://troubleshootmyvehicle.com/jeep/4.0L/diagnosing-P0112-trouble-code-1


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tjkj2002

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I have an 03 liberty 3.7l that will not run.. Had aP0112 code for iat..I replaced it with no luck..been troubleshooting and found that its reading over 300° is not faulty..I can pull it out of intake and leave plugged up and jeep will start and idle but is rough and iat reading sits around 102°.. if I try to install iat temps jumps above 300 and jeep shuts off.. seems like intake air temp is getting above 300° what could cause this..

I'm guessing you dropped a valve seat and the hot combustion gases are getting back into the intake causing the 300+ degree IAT temps.

Would explain the rough running also.
 

tjkj2002

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Could I determine which cylinder by compression testing.. What are my repair options..

Yes a compression test you tell which cylinder(s).

Your either looking at a new head(s) or if the damage is bad enough a new engine.If you have high miles just plan on a remaned engine,no point putting a new head(s) on a high mileage lower end.

But you will want to find the cause of the overheating before repairing if a valve seat did drop,the only reason why a valve seat drops(overheated engine).
 
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