codes 171 and 174... - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 02-10-2011
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codes 171 and 174...

Hi all, before you jump all over me for not searching, i know what the codes mean. I have cleaned the IAC and that didn't do anything. Now i am ready to check for vac leaks... this is where my question comes up. Can someone post a pic to show all of the vac lines and also suggest any other checks that i should do.

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Old 02-10-2011
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well i had a problem on my 03 4.0 with the vac hose elbow under the throttle body...they are known to crack...actually a TSB for it...how many miles on yours...mine had to be replaced at 57K
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Old 02-10-2011
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It has just over 100K on it.
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Old 02-10-2011
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yea definatly check that hose elbow...that very well might be the culprit
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Old 02-10-2011
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ok i will take a look at it. Thanks
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Old 02-10-2011
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Did you clean the MAF with some MAF cleaner?
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