Hi all, new here:

220,000km, Ford ranger edge 2003, 3.0 V6

I was previously driving at highway speeds uphill when I noticed my Ranger jerking back and forth with my check engine light flashing. I decreased speed to 60Km/h sitting just under 2500 RPM somewhat comfortably, any RPM over 2500 would cause the check engine light to flash.

I replaced the spark plugs and wires after running a scan which showed the following codes:
P0171, P0175, P0304, P0305, P0306.
After no difference I decided to replace the two 02 upstream sensors and rear 02 sensor, after removing the front two upstream cat pipes, I was able to slide my phone in to take a picture of the drivers side cat, it still had the honeycomb intact and looked clean.

I've got a rough idle sitting at about 6-700 RPM's, as I accelerate past 3500- 4000Rpms whilst driving I can hear a rattling noise almost as if though i'm maxing out the capacity of the engine whilst stuck at 40-60km/h, thats why I took the front cat of the exhaust manifolds to inspect for something rattling around inside.

Any help would be greatly appreciated, I'm thinking of injectors or valve? going to do a compression test on the spark plug holes tomorrow.

Thanks!

 

Welcome to the forum

Just as a heads up

I had a clutch replaced on a V6 and the shop REVERSED my upstream O2 sensor wires, when they reinstalled the exhaust "Y" pipe
Got the same Rich on one side and Lean on the other codes

Did you change upstream O2s 1 at a time, so you didn't unplug BOTH O2 sensors at the same time?

2003 3.0l Drivers side upstream O2 will have a Red/black stripe wire and Yellow/blue stripe wire at the connector, passenger side uses different colors
The O2 connectors are universal so not specific to a side

 

thanks for the reply, i changed the passenger 02 sensor first as it was the easiest to come undone, I then unscrewed the drivers side 02 sensor and replaced with a new one. I ran the vehicle and took it for a test drive until changed the 3rd rear 02 sensor