2010 FX4 5.4 3v?
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Trailering
Joined: Jan 2016
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2010 FX4 5.4 3v?
my truck runs smooth no ticking or rattling but has NO power and gas mileage is at 8.5 I ran codes and VVT solenoid codes came up on both banks. I real a lot of bad VVT cause rough running sounds like a diesel but is it possible for them to stick in retarded state and run good just no power at all? Its like half my throttle is useless and does nothing.
Blessings,
Mike
Blessings,
Mike
Cross-Country
Joined: Dec 2023
Posts: 99
Likes: 30
From: Rochester Mn
My 2010 5.4L 3V ran perfectly smooth at idle and on the road until the engine got up to temperature, then would idle poorly as you have described due to bad vvt timing.
When the engine hot and idling poorly, I could just punch the gas pedal to raise the RPM and hence the oil pressure and the engine would return to a normal idle.
The timing repairs required both rebuild of the VVT timing (tensioners, timing chain, rollers, control valve) and replacement of the oil pump with a higher pressure, higher volume oil pump. In addition, because the prior owner had neglected the repair when the behavior started, then the additional cost of a cam shaft replacement. Cost was around $7100 at the Ford dealership.
I did not experience any severe loss of power as you describe. The engine would snap out of it quickly by just reving the engine at idle when coming to a stop at an intersection to help avoid the cam phasor issues.
if the symptoms of the cam phasor (VVT) aren’t worse at hot engine temperature then I might expect the MAF sensor or something of that nature that affects the gas/air mixture to be the source of the symptoms you describe. If the cam phasor problem exists, one had better get it fixed as it could destroy your engine.
When the engine hot and idling poorly, I could just punch the gas pedal to raise the RPM and hence the oil pressure and the engine would return to a normal idle.
The timing repairs required both rebuild of the VVT timing (tensioners, timing chain, rollers, control valve) and replacement of the oil pump with a higher pressure, higher volume oil pump. In addition, because the prior owner had neglected the repair when the behavior started, then the additional cost of a cam shaft replacement. Cost was around $7100 at the Ford dealership.
I did not experience any severe loss of power as you describe. The engine would snap out of it quickly by just reving the engine at idle when coming to a stop at an intersection to help avoid the cam phasor issues.
if the symptoms of the cam phasor (VVT) aren’t worse at hot engine temperature then I might expect the MAF sensor or something of that nature that affects the gas/air mixture to be the source of the symptoms you describe. If the cam phasor problem exists, one had better get it fixed as it could destroy your engine.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,325
Likes: 315
The nasty noises may not be apparent if you deal with the timing system quickly enough.
The oil pump may not be getting clogged full of tensioner and guide plastic just yet, so the chains may stay somewhat tight. Can phasers won’t start clacking until oil pressure drops below 20 PSI, I believe. No, the dash gauge won’t tell you that as it’s fake. As mentioned above, the oil pump isn’t all that great, so even a healthy 5.4 may chew up followers on the passenger side where the oil reaches last.
That being said, you may get plenty of soft misfires that will eat those cat converters alive in the meantime.
The oil pump may not be getting clogged full of tensioner and guide plastic just yet, so the chains may stay somewhat tight. Can phasers won’t start clacking until oil pressure drops below 20 PSI, I believe. No, the dash gauge won’t tell you that as it’s fake. As mentioned above, the oil pump isn’t all that great, so even a healthy 5.4 may chew up followers on the passenger side where the oil reaches last.
That being said, you may get plenty of soft misfires that will eat those cat converters alive in the meantime.
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