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Engine bogging issue.

1997 - 2003 F-150

Engine bogging issue.

  #1  
Old 05-15-2018, 09:54 PM
Joe Kearce's Avatar
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Engine bogging issue.

This question may have been answered in previous threads, but I literally just joined and am having an issue.
I can be riding along in my 02 F150 5.4L 4◊4 with no issues, accelerates fine. I bury the throttle to pass and engine bogs out. Back out the pedal, things level out, and I can press down enough for passing gear to kick in and make the pass if room/traffic allows.
In the last 6 months I have replaced air filter, MAF sensor, both upstream 02 sensors. Had PO171 and 174 codes for a while, but new MAF fixed that issue.
Have heard running lean for a while will destroy plugs....any truth. Any help will be helpful
 
  #2  
Old 05-16-2018, 09:11 AM
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Have you checked the fuel pressure?
 
  #3  
Old 05-16-2018, 10:05 AM
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Not yet. Was looking for ideas or suggestions to sorta guide in the direction.
 
  #4  
Old 05-16-2018, 11:34 PM
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Pull the plugs and look at them. Change the fuel filter and test the fuel pressure.
 
  #5  
Old 05-17-2018, 12:17 AM
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What spark plugs do y'all suggest I run? I know Motorcraft is the brand, just looking for something other than plain old platinum
 
  #6  
Old 05-17-2018, 01:21 PM
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Why? Just use the Motorcrafts.
 
  #7  
Old 05-18-2018, 10:37 AM
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Motorcraft SP479. No antiseize, torque to 28 ft/lb.
 
  #8  
Old 05-20-2018, 01:13 AM
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Sounds much like a lack of fuel pressure.
1. Wide open throttle does not use OX sensor inputs. The computer switches to rich fixed fuel tables at about 7/8 throttle positions.
2. Codes 171/174 richens fuel by moving fuel tables rich. This is what sets the codes.
.
The motor needs more fuel under all these conditions.
Good luck.
 
  #9  
Old 05-20-2018, 09:31 AM
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The auto parts stores close to me have fuel pressure gauges for loan and it is easy to check the pressure at the shrader valve on the fuel rail.
 
  #10  
Old 06-07-2018, 02:18 AM
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Originally Posted by Joe Kearce View Post
This question may have been answered in previous threads, but I literally just joined and am having an issue.
I can be riding along in my 02 F150 5.4L 4◊4 with no issues, accelerates fine. I bury the throttle to pass and engine bogs out. Back out the pedal, things level out, and I can press down enough for passing gear to kick in and make the pass if room/traffic allows.
In the last 6 months I have replaced air filter, MAF sensor, both upstream 02 sensors. Had PO171 and 174 codes for a while, but new MAF fixed that issue.
Have heard running lean for a while will destroy plugs....any truth. Any help will be helpful
sounds just like my post, my truck is slow with no check engine light (old ladies leave me at stop lights) but After a year of holding it off and still no cel Iíve cut it down to the catalytic converter being bad.. not 100% sure but my truck runs fine just struggles to gain speed and suffers in gas mileage because of it l. If you were having a fuel pressure problem it would throw those p0171 and p0174 all the time and more than likely some random misfires.. just my opinion tho Iím not a professional just a guy going through similar things
 


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