Surging under acceleration
#1
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Surging under acceleration
So recently i bought a 2004 f150 lariat 5.4l 3v. Has 188000km was owned by an older gentleman. After having it for a few thousand kilometers it started to buck and surge under acceleration, it got worst when i had to drive in the rain for a few hundred km. I did some research on the internet and thought i had it narrowed down to the fpdm, i replaced it and was rotted very bad. Thought that fixed it. Drove 60km without issue and then on the drive back it started to surge as i tried to give it gas going up the hill. The time in the rain when it was bad 3 codes popped up, lean on both banks, p0174 p0171 and another one i cant remember at the moment. That what gave me the idea it was the fuel module. After replacing it i now have the code p0191 popping up, fuel rail pressure sensor. With more reading into the issue, i narrowed it down to a junction under the driverside door on the frame or my tps is bad. Any input would be appreciated, also was wondering since i didnt disconnect my battery after replacing the fpdm, wondering if that could be a problem. Usually doesnt happen until its up to working tempature, i can push on the gas in park and neutral without issue. also if i turn the truck off and then fire back up it wont act up until a few km. Im puzzled at the moment. will a bad tps mess with the amount of fuel going to the rails?
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#8
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Yeah I was thinking the same and changed it, at the moment it's freezing out and I am away at school. Can't have the truck down because it's y daily driver or I would tackle plugs and coils.