5.4 stumble upon acceleration when cold
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Junior User
Joined: May 2010
Posts: 98
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From: Kentucky
5.4 stumble upon acceleration when cold
Hello all....I am used to posting over in the dentside section....anyway, I have a 98 5.4 that, when cold, idles fine. ifI open the throttle suddenly, the engine stumbles and almost dies. If I slowly rev it, it will accelerate fine.
The warmer the engine gets, the less the stumble upon moderate/sudden acceleration. When fully warm, it runs great with no power issues.
Ijust serviced it and could smell gass in the oil. The unit sits alot (32,000 miles) I R+R the fuel filter with no effect....fuel pressure is normal and there are no codes. I can see nothing with the scanner that looks out of line.....Any thoughts?
The warmer the engine gets, the less the stumble upon moderate/sudden acceleration. When fully warm, it runs great with no power issues.
Ijust serviced it and could smell gass in the oil. The unit sits alot (32,000 miles) I R+R the fuel filter with no effect....fuel pressure is normal and there are no codes. I can see nothing with the scanner that looks out of line.....Any thoughts?
Senior User
Joined: Sep 2011
Posts: 448
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Smell of gas in the oil, when you checked your fuel pressure at the rail did you do the hold test for 5 mins to see if your pressure drops within that 5 mins, indicating a leaking injector or injectors, constant drip until pressure is gone ususally ends up wih gas in the oil pan, does exhaust smell gassy on start up?
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Junior User
Joined: May 2010
Posts: 98
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From: Kentucky
I have to go get the fuel pressure gauge again to check the injectors like referred to before....i put fuel injector cleaner in it and drove it today. It did feel a little weak on power and the SES light came on. It has active lean bank 1 and 2 codes P0171 and P0174. Does a 98 e-150 5.4 have a fuel rail pressure sensor? Because my scanner shows 0.....I know i need to recheck fuel pressure when i get my gauge back....
Just curious bout the sensor....
Just curious bout the sensor....
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Itch71
1987 - 1996 F150 & Larger F-Series Trucks
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Jan 3, 2008 01:24 PM
