99ExplorerOHV
New Member
- Joined
- March 8, 2010
- Messages
- 5
- Reaction score
- 0
- City, State
- Vacaville California
- Year, Model & Trim Level
- 1999 4x4 Explorer 4.0 OHV
1999 explorer 4.0 OHV (VIN X). I changed the head gaskets (#6 hole was blown), fuel injectors, MAFS, Spark plugs, wires, distributor, fuel pressure regulator, fuel filter. I keep getting a check engine light for P0172 and P0175, left and right bank running rich. The injectors were bought on ebay from a reputable dealer. They were also advertised as the correct injectors for the OHV engine, not the SOHC engine. When I checked the flow rates for the old ones and the flow rates for the new ones, the new ones turned out to be about 6 lbs per hour more than the old ones. Additionally, the old fuel pressure regulator was showing 65 psi at the rail and did not change whether the engine was running or when I snapped the throttle. It also didn't change when i disconnected the vacuum line. Buying a new fuel pressure regulator was a waste of $108.00 because nothing changed. The brand new one had the same exact characteristics as the old one. Could either the fuel pressure regulator be bad from Ford or the higher flow rate injectors cause the engine to run rich and illuminate that light or should I be looking at something else? Any help would be appreciated.