Why won't my 2004 f 150 4.6l truck start

Asked by Jan 31, 2017 at 10:07 AM about the 2004 Ford F-150 STX Ext. Cab 4WD

Question type: Maintenance & Repair

I parked truck, the next day it would not start.  It cranks, I
disconnected my MAF and sprayed throttle, truck starts and idols but
it turns off if I plug MAF back or if I try giving it gas.

5 Answers

23,970

Try cleaning the element inside the MAF with electrical contact cleaner spraying it on gently. It a thin wire. Use no cuit-tip swap. Clean the IAC while at it. It cost nothing.

OK, tha

Thanks, I will clean the IAC. I turned it on today and when I tried to plug in the MAF the truck went to stall, so I unplugged it quick. It stayed on so I plugged the MAF in again, and I heard a click, and the truck kept running fine. It is turning off and on fine, but I know it will happen again. I think it sounded like a relay click. I am going to start changing relays from a parts truck. What do you think?

23,970

If you hear a click it could be the IAC. It opens and closes and should do so smoothly. See if you can feel the click on the IAC when the engine starts. The net should instruct you on how to check an IAC and what faults to look for. Also check for a faulty electrical to the IAC, clean with electrical contact cleaner. Get codes read, you could have a fault registered that is not causing the idiot light to flash.

OK will do. Thanks,I will let you know what happens.

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