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Rough idle? P0171, P0174? Here's what you need to check first!!!
Well it turns out it was the fuel pump. Just goes to show that the lean codes generally associated with a vacuum leak can sometimes be a more involved. Fortunately I found a guy to drop the tank and replace it with all for under $450. I returned the o2 sensors & fuel pressure regulator. I hope...- glen615
- Post #74
- Forum: How To Section
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Rough idle? P0171, P0174? Here's what you need to check first!!!
Yes the hose came with both elbows and the pcv. Yesterday I replaced the MAS with a new one and that did nothing and I also replaced the fuel filter but no luck either. Tomorrow I will swap both upstream 02 sensors and possibly the fuel pressure regulator and after that I have no idea what...- glen615
- Post #72
- Forum: How To Section
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Rough idle? P0171, P0174? Here's what you need to check first!!!
I had cleared my codes when I completed the work and the truck seemed to run smoothly but about 80 miles later it wanted stall. It tends to happend when slowly accelerating from a stop.- glen615
- Post #70
- Forum: How To Section
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Rough idle? P0171, P0174? Here's what you need to check first!!!
Hi All I hope I a can get a little help on what my issue with my 2001 Expedition might be. This is 5.4 V8 2x4. The check engine is on and throwing P0171 and P0174 codes. Both banks I understand from my research. So I have replaced the PCV (the whole assembly, hose, and elbow) since it came...- glen615
- Post #68
- Forum: How To Section
