potshotscott
Registered User
Good evening,
I'm stumped. I'm working on a 97 Ranger 2.3 that has a misfire problem. It has coded out for misfire on #2 cylinder in the past but since I disconnected the PCM to Ohm out some wires the codes are gone and have not come back. Things I've already done:
1. Verified resistance within 3K Ohms on all plug wires (except #4 intake side since it's nearly impossible without taking off the intake manifold)
2. Verified resistance of all fuel injectors
3. Verified wiring to injectors both 12V supply and signal wires all the way back to the PCM
4. Measured pulses at coil packs to determine that the timing to them seems normal (they get signal to fire)
5. Swapped each coil pack out one at a time with a known good unit (no significant changes)
6. Inspected all plugs (except #4 again) set gap to ~1.10mm in accordance with Ford specifications - plugs were fairly clean
I drove the truck today for 20 minutes total time and codes did not set. Once above about 1200 RPM the engine runs seemingly smooth. Idle's like it's missing. Was going to pull the MAF out of the loop next to see if default inputs to the PCM clear it up. Anyone else have any ideas? I'm thinking about shotgunning plug wires and coil packs.
Scott
I'm stumped. I'm working on a 97 Ranger 2.3 that has a misfire problem. It has coded out for misfire on #2 cylinder in the past but since I disconnected the PCM to Ohm out some wires the codes are gone and have not come back. Things I've already done:
1. Verified resistance within 3K Ohms on all plug wires (except #4 intake side since it's nearly impossible without taking off the intake manifold)
2. Verified resistance of all fuel injectors
3. Verified wiring to injectors both 12V supply and signal wires all the way back to the PCM
4. Measured pulses at coil packs to determine that the timing to them seems normal (they get signal to fire)
5. Swapped each coil pack out one at a time with a known good unit (no significant changes)
6. Inspected all plugs (except #4 again) set gap to ~1.10mm in accordance with Ford specifications - plugs were fairly clean
I drove the truck today for 20 minutes total time and codes did not set. Once above about 1200 RPM the engine runs seemingly smooth. Idle's like it's missing. Was going to pull the MAF out of the loop next to see if default inputs to the PCM clear it up. Anyone else have any ideas? I'm thinking about shotgunning plug wires and coil packs.
Scott