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1999 F150 5.4L error code P1506

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Old

Sep 9, 2013 | 05:55 PM

#1

pleshdog21

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1999 F150 5.4L error code P1506

Hello,

I have received the error code P1506 on my 1999 F150 which is I believe an idle air control overspeed error. It seems to run a little rough at idle but not too bad. At the advice of my Haynes repair manual and the advice of a friend I have already replaced the IAC valve and the PCV valve on the engine and cleared the code, only for it to come back again after 50K miles.

I am not sure where to go next with the diagnosis/fix. Any help would be much appreciated.

Thanks!

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Old

Sep 10, 2013 | 06:42 AM

#2

projectSHO89

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From: St Louis

Good chance you have a vacuum leak although that usually results in other symptoms.

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