2001 E350 5.4 V8 P0171 and P0174 Check Light. Rough idle as well.
I have a 2001 E350 5.4 V8 15-Passenger Van. The other week I had a bad coil pack. I went in and removed it but while I was at it I went in and changed all the plugs. I removed the Fuel Rail and the ejectors to clean them while I was at it. I replaced all the o-rings on the ejectors the one that goes into the manifold and the one that goes into the rail. The van drove fine for about 35-45 Miles and then this code came up. I have ScanXL on my laptop so I am able to connect and read the codes. There is also an issue when I start it that It will start and then the idle will drop to around 100RPM and then will jump to around 700-800RPM. After that it is fine. It does this if the engine is cold or hot. I haven't noticed anything wrong with driving the van. I was looking around and it looked like a Vacuum leak but none of the things that go wrong with a leek apply to the van. i.e - Brakes not working fully, Problems speeding up or the car feeling sluggish. None of this happens at all. The van drives just fine. It has around 200K miles on it. There is one other thing but I haven't been able to find anything on it. When I start the car and let it set parked with the A/C and Heat off. I hear what sounds like a whirling sound coming from the engine bay. I tried to locate it but I could find it. Does anyone know of what could cause this. Or where I should start looking?