2004 5.4l engine dies intermittently
#1
2004 5.4l engine dies intermittently
I just purchased a 2004 F150 XLT with the 5.4 Triton engine a few months ago and it has started to die at idle. No problem restarting (usually). Its not throwing any codes and due to my online research I replaced the fuel pump module with spacers....no help. My mechanic has performed extensive troubleshooting but there is no pattern to the symptom.
162,000 miles.
Any help appreciated
162,000 miles.
Any help appreciated
#2
Senior Member
I just purchased a 2004 F150 XLT with the 5.4 Triton engine a few months ago and it has started to die at idle. No problem restarting (usually). Its not throwing any codes and due to my online research I replaced the fuel pump module with spacers....no help. My mechanic has performed extensive troubleshooting but there is no pattern to the symptom.
162,000 miles.
Any help appreciated
162,000 miles.
Any help appreciated
These vehicles are unfortunately prone to issues with the vct system when the engine is warm and the oil thins out. One of the possible symptoms is possible stalling if one of the phasers gets stuck in a retarded valve timing position when it needs to return to the base Advanced position.
What kind of oil are you running? A lot of people have improved success with running 5w30 or 0w40 instead of the original 5w20
#3
Will it ever die at highway speed (or only at stop/idle)?
Does it ever die if it just sits there idling, or is it only if it’s been driving/warm and then you slow/stop to idle ?
When it does die, is time/rest the only thing required to get it to restart?
#4
Mark
iTrader: (1)
Fuel/Air/Spark
#5
05 5.4l 3v s.crew lariat
You need a scanner like torque pro to look at fuel trims . I would see if it leans towards a vacuum leak . At idle the engine is very sensitive to vac leaks as ratio gets way off if unmetered air getting in . O2 will see to much oxygen and will try to add fuel if vac leak . It should be in closed loop with very low short term /long term readings . Torque pro will list by cyl any raw computer counts building towards setting a code for misfires .
You can also see o2 switching as normal or a dead o2. Heater must be working on o2 -common to blow a fuse on that heater if wires get burnt from exhaust manifold .
Plugs/boots are only good for 60k miles. clean cop terminals . Injectors are bad around this year - youtube test and clean diy .
You can also see o2 switching as normal or a dead o2. Heater must be working on o2 -common to blow a fuse on that heater if wires get burnt from exhaust manifold .
Plugs/boots are only good for 60k miles. clean cop terminals . Injectors are bad around this year - youtube test and clean diy .
#7
Mark
iTrader: (1)
Damn... High School was a long time ago and I was just too busy chasing those girls.
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#9
what did mechanic test/do? OTHER THAN SCAN FOR CODES ONLY CLEANED THE THROTTLE BODY
Will it ever die at highway speed (or only at stop/idle)? STOP/IDLE ONLY
Does it ever die if it just sits there idling, or is it only if it’s been driving/warm and then you slow/stop to idle ?
When it does die, is time/rest the only thing required to get it to restart? WORST CASE AS IT IS ATTEMPTING TO DIE I CAN WORK THE THROTTLE AND EVENTUALLY IT RESUMES NORMAL RPM
I HAVE CHANGED THE FUEL PUMP MODULE AND INSTALLED A NEW THROTTLE BODY WITH A NEW THROTTLE POSITION SENSOR
Will it ever die at highway speed (or only at stop/idle)? STOP/IDLE ONLY
Does it ever die if it just sits there idling, or is it only if it’s been driving/warm and then you slow/stop to idle ?
When it does die, is time/rest the only thing required to get it to restart? WORST CASE AS IT IS ATTEMPTING TO DIE I CAN WORK THE THROTTLE AND EVENTUALLY IT RESUMES NORMAL RPM
I HAVE CHANGED THE FUEL PUMP MODULE AND INSTALLED A NEW THROTTLE BODY WITH A NEW THROTTLE POSITION SENSOR
#10
Ford Truck Lover
Any update? My truck died twice at idle in a drive-thru this evening. Started right back up but disconcerting to say the least.