My issue, will accelerate to 2000 RPM. Then when I floor it engine bog's down. When I let up on the gas pedal half way, engine accelerates and takes off as long as I keep her around 2000 RPM. No miss firers. New plugs, coils and wires. New fuel pump. Cleaned MAF. Getting Codes P0171 & P0174. 1998 Ford Expedition 5.4L, 130k miles.
Vehicle Losing Power When Accelerating
- Thread starter BOB4254
- Start date
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Did you change the fuel filter, check fuel pressure at rail?
Fuel filter changed 20k miles ago. Pressure at rail = 29
Feels like she's not getting the fuel she requires when accelerating bogs down.
Could it be a bad Fuel Pressure Regulator???
Very smooth and quiet idle.
Feels like she's not getting the fuel she requires when accelerating bogs down.
Could it be a bad Fuel Pressure Regulator???
Very smooth and quiet idle.
It sure could, that would be my next move..
Installed new Fuel Pressure Regulator. Condition did not improve.
Something very interesting someone may have an answer to. I installed a new fuel filter. OMG she accelerated like she did when she was new. I thought my acceleration problem was solved. Next day I started her she started fine and idles smooth and quiet.
Took her for a spin and now she when back to very poor acceleration. Same problem I had.
(will accelerate to 2000 RPM. Then when I floor it engine bog's down. When I let up on the gas pedal half way, engine accelerates and takes off as long as I keep her around 2000 RPM).
I'm thinking to install new MAF Sensor.
Any advice. Very confused at this point.
Something very interesting someone may have an answer to. I installed a new fuel filter. OMG she accelerated like she did when she was new. I thought my acceleration problem was solved. Next day I started her she started fine and idles smooth and quiet.
Took her for a spin and now she when back to very poor acceleration. Same problem I had.
(will accelerate to 2000 RPM. Then when I floor it engine bog's down. When I let up on the gas pedal half way, engine accelerates and takes off as long as I keep her around 2000 RPM).
I'm thinking to install new MAF Sensor.
Any advice. Very confused at this point.
From what I have read, the EGR valve can compromise acceleration pretty dramatically..
99WhiteC5Coupe
Full Access Members
If you replaced the fuel filter and it ran fine for a short period of time - then began the bogging / fuel starvation issue, I’d bet you got a tank of bad gas with some type of contaminant (or someone put something in your fuel tank).
The new fuel filter probably loaded-up with whatever was in the fuel tank - and now you’re having the same problem.
Do you have the old filter? If so, cut it in half and see if the filter media is loaded-up with debris.
Yes I thought the same thing. I will cut old filter open.
I have locking gas cap so gas tank cannot be accessed to put something in tank.
Before installing new fuel filter I checked gas in tank for contaminants. 8 glass jars, clear fuel.
I have always used Shell gas and Shell/Nitro for last 2 years.
Thanks for your post and advice.
I have locking gas cap so gas tank cannot be accessed to put something in tank.
Before installing new fuel filter I checked gas in tank for contaminants. 8 glass jars, clear fuel.
I have always used Shell gas and Shell/Nitro for last 2 years.
Thanks for your post and advice.
The above could be..but
Unfortunately we get the same symptoms for different problems.. For this reason, I try to do the easy stuff first..
The throttle position sensor can do your symptom too
This is a good video to watch
youtu.be
Unfortunately we get the same symptoms for different problems.. For this reason, I try to do the easy stuff first..
The throttle position sensor can do your symptom too
This is a good video to watch
Symptoms of a Bad Throttle Position Sensor and How See if it Has Failed
Symptoms and signs of a bad throttle position sensor (TPS), how it works, and how to see if it has failed. Read here for more information. https://www.backya...
youtu.be
