 2003 Ranger 1 Scan 5 Codes
My Ranger has a V6 3.0L EFI. It the last few weeks the idle has become rougher. When I was in fast food drive thru the check engine light came on but was blinking then became solid. The next day it has disappeared. Tonight driving home I found that it was losing power as a tried to accelerator it seemed as if it was not going anywhere. Again the check engine light came on and was blinking, after I let the engine cool awhile it is now solid.
When I checked the codes I got the following P0306, P0175, P0300, P0304, P0305, P0171, and P0316. It is seems like it could be fuel related clogged fuel filter, injectors or air flow problems. I recently changed the air filter and not to long ago changed the spark plugs.
Well this weekend I attempted to hunt down the problem without much luck.
- replaced the Crankshaft Position Sensor with one from Pep Boys made by Wells (SU4101) that didn't change much it seemed to have a little more power but the codes remained.
- I also replaced all the spark plugs and wires with Autolite Double Platinum Plugs (APP 104) and BWD Select Professional Wires (CH86754)
- Cleaned the MAF sensor
- Checked Air Filter still almost new
- Replaced the fuel filter with a Purolator brand one (F55523) from Pep Boys
- Replaced the Upstream (Bosch 13117) and Downstream (Bosch 15716) O2 sensors
- I checked the compression on each of the cylinders and got
Cyc 1st 2nd
1 135 150
2 130 135
3 150 150
4 125 130
5 135 130
6 125 120
- Removed and inspected the Camshaft Position Sensor. I had read the posts here regarding it and visually it looked fine I didn't see anything the struck me as wrong. Is the best bed to just replace it?
I am still receiving the codes P0306, P0300, P0304, P0305, and P0316
Any recommendations on where to go on troubleshooting this. | 
