Dirt
New Member
- Joined
- Dec 1, 2020
- Messages
- 10
- Reaction score
- 5
- Points
- 3
- Location
- United States
- Vehicle Year
- 1988
- Make / Model
- Ford Ranger
- Transmission
- Manual
Hello! I have a 1988 Ford Ranger with a 2.9 V6, 4x4, and a 5 speed manual transmission. I just recently purchased this fine machine and I am the 3rd owner. This rig has 192,000 miles on the clock and had sat in the woods for four years before the previous owner bought it in 2017. My problem started last month when my mother was driving it to her workplace about 5 miles away. She said it started to lose power and shake midway through the trip so she pulled off into a parking lot. She called me and I wrenched on it all day with a buddy. We have replaced the IAC valve, TPS sensor, and also have done a number of troubleshooting tests. Since then we limped it home and I've been working on it ever since. Here is what I know: We ruled out fuel delivery because there is good fuel pressure and a clean filter. (30PSI at the fuel rail and a brand new filter) All six cylinders have spark and all of the cables are within specification for resistance. From there, I checked the injector pulse with a Noid light and it turns out cylinders #5, #3, and #6 have very weak pulse (almost invisible in daylight) #5 is ok but not as bright as the other three. All 6 injectors have 12 volts fed to them so I know the problem lies in the (ground) pulse from the ECM. There were two connectors for the fuel injection wiring harness that had heavy corrosion. We cleaned those. On the same day we cleaned the connectors the misfire went away and I thought I had fixed it. This morning when I tried to go get gas the problem was back and just as bad as before. (Today was about 45 degrees outside.) I am sorry to give you so much information but I wanted to cover all my bases. if anyone has insight that could help or tricks to try please help me. Thanks.