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    Check Engine Light On -po174 when plugged few hours runs okay

    :exp: Update, my tinitus wasn't too bad the other morning and I could hear a slight hissing.... on the passenger side couldn't pin point it.....so went out bought myself a big cigar.....for the next morning... So next morning I took off the left back vacumn hose and put my fancy air...
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    Check Engine Light On -po174 when plugged few hours runs okay

    thanks Joe Doe...... here is the question...... If you plug in your vehicle...that is block heater....for an hour and a half will that warmup the upper intake o rings to the point where the vehicle starts smoothly or, is it more likely that the engine temperature sensor is affected...
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    Check Engine Light On -po174 when plugged few hours runs okay

    I think this site rules! Nice to be able to get some tips from other owners or mechanics.... Thanks again!
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    Check Engine Light On -po174 when plugged few hours runs okay

    cleaned the MAF several days back...but used to clear the code via disconnecting the battery I hear....suppose to clear the codes through the code reader.... maybe I should do it again through the code reader....
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    Check Engine Light On -po174 when plugged few hours runs okay

    thank you very much for your help.......will replace the part....I had it narrowed down to a couple things and this illiminates sooooo much....:)))
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    Check Engine Light On -po174 when plugged few hours runs okay

    Appreciate the help Bobflood!!!!!! Engine temperature sensor..... So that means just by plugging in the vehicle the engine is warmed up enough to run smoothly upon cold start? Concerning the a/c -so why is it that the a/c kicks in every 5-10 seconds? This is so strange... O:)
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    Check Engine Light On -po174 when plugged few hours runs okay

    Hi Everyone Check Engine Light On. PO174 :( Problems is when I start my vehicle up [1998 Explorer xlt 4.0L SOHC] in the mornings with a/c and other controls off, it runs rough, idle varies up and down, almost to stall, hard to control with throttle peddle, :( ,after warms up for a few...
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