5.4 Problems--low idle speed, random shutoff
03-30-2015, 12:31 PM
#1
is actually a Chevy guy
Thread Starter
5.4 Problems--low idle speed, random shutoff
Just started having problems with my truck. Got a new battery put in on Saturday, and when I got back from AutoZone, I pulled into the parking garage, stopped so I could reverse into a spot, and truck shut off before I could even take it out of drive. "Low Oil Pressure" flashed in on the little screen in the dash. So I parked and checked the oil, which was full. There aren't any leaks that I've seen, so I wasn't surprised. So anyway, I take it out again, and it starts idling really low, like 450-500 rpm, as opposed to a normal 800 or so rpm. Once, at a stoplight, it actually started shaking, and it stopped after I got up to speed and hasn't done that since. Anyways, I've done a little reading on here and I think my cam phasers are finally going out. I've had the tick for a while (I'm at almost 193000 miles) and we've taken very good care of this truck so I know it's not something that we neglected to do. Anyways, if anybody has a diagnosis for me, I'd greatly appreciate it. Truck is definitely still drivable, it just doesn't feel 100%. Thanks in advance.
03-30-2015, 12:43 PM
#2
Just started having problems with my truck. Got a new battery put in on Saturday, and when I got back from AutoZone, I pulled into the parking garage, stopped so I could reverse into a spot, and truck shut off before I could even take it out of drive. "Low Oil Pressure" flashed in on the little screen in the dash. So I parked and checked the oil, which was full. There aren't any leaks that I've seen, so I wasn't surprised. So anyway, I take it out again, and it starts idling really low, like 450-500 rpm, as opposed to a normal 800 or so rpm. Once, at a stoplight, it actually started shaking, and it stopped after I got up to speed and hasn't done that since. Anyways, I've done a little reading on here and I think my cam phasers are finally going out. I've had the tick for a while (I'm at almost 193000 miles) and we've taken very good care of this truck so I know it's not something that we neglected to do. Anyways, if anybody has a diagnosis for me, I'd greatly appreciate it. Truck is definitely still drivable, it just doesn't feel 100%. Thanks in advance.
Drop yer spare, unplug and remove yer FPDM and inspect it closely. http://www.f150online.com/forums/art...placement.html
If it appears in any way compromised - replace with a Motorcraft unit, not Dorman (which are crap).
The 'Low oil Pressure' warning is a result of the engine not running - ergo: there is in fact no oil pressure, lol.
MGD
03-30-2015, 02:26 PM
#3
is actually a Chevy guy
Thread Starter
Get any and ALL codes pulled - even stored pending codes that won't trigger yer CEL.
Drop yer spare, unplug and remove yer FPDM and inspect it closely. http://www.f150online.com/forums/art...placement.html
If it appears in any way compromised - replace with a Motorcraft unit, not Dorman (which are crap).
The 'Low oil Pressure' warning is a result of the engine not running - ergo: there is in fact no oil pressure, lol.
MGD
Drop yer spare, unplug and remove yer FPDM and inspect it closely. http://www.f150online.com/forums/art...placement.html
If it appears in any way compromised - replace with a Motorcraft unit, not Dorman (which are crap).
The 'Low oil Pressure' warning is a result of the engine not running - ergo: there is in fact no oil pressure, lol.
MGD
03-30-2015, 03:56 PM
#4
Senior Member
you pulled the battery. do the PCM relearn procedure (page 238 of your owners manual):
Because your vehicle’s engine is also electronically controlled by a
computer, some control conditions are maintained by power from the
battery. When the battery is disconnected or a new battery is installed,
the engine must relearn its idle and fuel trim strategy for optimum
driveability and performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift in P (Park) (automatic transmission) or the neutral
position (manual transmission), turn off all accessories and start the
engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to
relearn the idle and fuel trim strategy.
• If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle
trim is eventually relearned.
If the battery has been disconnected or a new battery has been installed,
the clock and the preset radio stations must be reset once the battery is
reconnected.
Because your vehicle’s engine is also electronically controlled by a
computer, some control conditions are maintained by power from the
battery. When the battery is disconnected or a new battery is installed,
the engine must relearn its idle and fuel trim strategy for optimum
driveability and performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift in P (Park) (automatic transmission) or the neutral
position (manual transmission), turn off all accessories and start the
engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to
relearn the idle and fuel trim strategy.
• If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle
trim is eventually relearned.
If the battery has been disconnected or a new battery has been installed,
the clock and the preset radio stations must be reset once the battery is
reconnected.
03-30-2015, 04:21 PM
#5
is actually a Chevy guy
Thread Starter
you pulled the battery. do the PCM relearn procedure (page 238 of your owners manual):
Because your vehicle’s engine is also electronically controlled by a
computer, some control conditions are maintained by power from the
battery. When the battery is disconnected or a new battery is installed,
the engine must relearn its idle and fuel trim strategy for optimum
driveability and performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift in P (Park) (automatic transmission) or the neutral
position (manual transmission), turn off all accessories and start the
engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to
relearn the idle and fuel trim strategy.
• If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle
trim is eventually relearned.
If the battery has been disconnected or a new battery has been installed,
the clock and the preset radio stations must be reset once the battery is
reconnected.
Because your vehicle’s engine is also electronically controlled by a
computer, some control conditions are maintained by power from the
battery. When the battery is disconnected or a new battery is installed,
the engine must relearn its idle and fuel trim strategy for optimum
driveability and performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift in P (Park) (automatic transmission) or the neutral
position (manual transmission), turn off all accessories and start the
engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to
relearn the idle and fuel trim strategy.
• If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle
trim is eventually relearned.
If the battery has been disconnected or a new battery has been installed,
the clock and the preset radio stations must be reset once the battery is
reconnected.