Question about 2001 Dodge Ram 1500 Truck 2WD

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2001 Dodge 1500 4x4 fault code PO 108

PO code 108, I changed the MAP sensor with no change, I have changed the IAC, with no change. Engine starts rough and the rpm goes from 500 to 2,000 while running very rich, after a minute or so the engine will actuall settle down and idle without running rich or pulsating in rpm. Any help please

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  • getair777643 Jan 13, 2009

    I have the snorkel off the intake now, I have sprayed throttle body and intake manifold gasket with starting fluid and found now change in personality. Could it be the computer to the controls?

  • getair777643 Jan 13, 2009

    I checked with starting fluid yesterday. I will put snorkel on and all and try with carb cleaner.
    Thank you for the help

  • Anonymous Mar 16, 2014

    when i start it it runs high then low up and down but when idrive it 45to70 it don,t do it only in park

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If you don't find that vacuum leak,( which is a common cause too) look with a scan tool at the reading on reported intake air temperature sensor. It should be within 10 Deg of your ambient temperature.
An air temperature sensor fault can cause flooding/starving of the engine. Some of the ones I've seen will report temperatures over 50F higher than the normal air temperature and fluctuate rapidly. Such a jump really affects how the computer calculates the mixture.

hope that helps some...

Posted on Jan 13, 2009

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Look for vacuum leak at air filter to throttle body ..all along the snorkel use carb cleaner while running and waft areas described til motor changes personalitly

Posted on Jan 13, 2009

  • milespeed Jan 13, 2009

    i said carb cleaner not starting fluid..sheesh... you need to have the snorkel instaled..all as normal and then spray around while idling to discover the vacuum leak... and hi99ins is correct about a common area to look with air temp sensor also....good luck

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