my truck wont start or idle by itself

Dustin Mullins

Asked by Mar 04, 2016 at 03:14 PM about the 2004 Ford F-150 Lariat Ext. Cab SB 4WD

Question type: Maintenance & Repair

i have a 2004 ford f150 5.4l lariat triton it turns over but wont start and if i
spray starter fluid in it ; it will start but i gotta stay on the gas it wont idle alone
but what i dont get is why wont it start and idle without the fluid

5 Answers


First you should check air filter and replace if necessary, change fuel filter if problem still persists get a fuel pressure test done.


Also add some fuel injector cleaner to gas tank will help clean dirty injectors if that is your problem.


Check fuel pressure at rail, ur not getting fuel


I bet you its the mass airflow sensor. Try unplugging it and starting, if it starts theres ur problem. Dont run it long unplug or it will foul your plugs


Its beats paying for a fuel pump, also replace fuel filter, may have restriction inside. Ofcoarse if it not the mass airflow sensor. My truck shut off while driving, thought fuel pump went out, but could hear if cycling for a few seconds. Turns out it was a 30 sensor... Good luck, 5.4 3v is the.worst engine ford has ever put out.. Im still having issues I can't figure out:/

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