badams21523636
New Member
- Joined
- Feb 9, 2018
- Messages
- 4
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1999
- Make / Model
- Ford
- Transmission
- Automatic
I have this 1999 extend cab ranger, it’s a 4.0 OHV, 4x4, auto. I got the truck intending to flip it but found that I really like the damn thing and have decided to keep. Thus, the heartache begins. I put an engine in it and all seemed well. It was hard starting but ran ok other than the lean codes. Found the fuel pressure at 40psi. (not good) replaced the pump and filter and got 70psi upon cycling the key. Starts well now. The truck has had a miss since I got it on the road. After doing some investigation I found that the miss only happens in the 2500-2600 RPM range. It happens in all gears and can be duplicated in park with no load on the engine. Searching the forums I have looked into all the usual culprits and just can not resolve this miss. I have done the following;
New pump and filter
New plugs (motorcraft SP-500’s)
New Motorcraft wires and coil
New IAC
Mass Air Flow cleaned, reading within specs and seems to be responding
TPS checked and is within spec and responding
Ran Techron through it 3 times
Nothing has changed the miss, I pulled wires off one at a time and ran the engine at the affected RPM the miss was always present. I know my way around an engine but I’m at my wits end with thing. The computer never shows a code, doesn’t register a misfire even when I disconnected the wires and ran it. No injector faults are shown. Passes the KOER and KOEO self tests. Any ideas would be great.
Thanks,
New pump and filter
New plugs (motorcraft SP-500’s)
New Motorcraft wires and coil
New IAC
Mass Air Flow cleaned, reading within specs and seems to be responding
TPS checked and is within spec and responding
Ran Techron through it 3 times
Nothing has changed the miss, I pulled wires off one at a time and ran the engine at the affected RPM the miss was always present. I know my way around an engine but I’m at my wits end with thing. The computer never shows a code, doesn’t register a misfire even when I disconnected the wires and ran it. No injector faults are shown. Passes the KOER and KOEO self tests. Any ideas would be great.
Thanks,