mjbags
Member
- Joined
- Mar 7, 2023
- Messages
- 3
- Reaction score
- 0
- Location
- Portland, OR
- What engine do you have?
- V8 engine
- What year is your Sport Trac?
- 2007
- What Generation is your Sport Trac?
- 2n Gen Owner
2007 ST Limited. 158k miles, no service records for the last 30k, runs great, EXCEPT...
I test drove it for 2 hours before I bought it. Obd scan came up clean with no pendings. First day after purchase I opened it up on the freeway and it threw a cylinder 8 misfire with the CEL flashing for about 10 seconds, and had some shift hesitation (only when accelerating from around 40mph) that was less a single hesitation, more like a series of attempts to find the gear until I punched the pedal to the metal. After inspecting/cleaning out the plug bay and coil, the pending code cleared and it hasn't come back. I know that people suggest a full plug and coil refresh, and I'd be astounded if that fixed the following symptoms with the 4x4:
In 4x4 low, I was experiencing some loud metallic clunking at random times, and almost always when braking. I also noticed less than stellar performance in the mud on a flat surface. I put the rig up on 4 jack stands and put it in 4 low and recorded what was happening; pressing the gas the first time caused all 4 wheels to turn. Letting up and pressing the gas again, I heard some low clunking, right front tire stopped spinning, and I could see the engine shaking in an unnatural way. In 4 high, I could get it revving up with the same grinding/clunking/engine shake but much more pronounced as the rpms increased, and this time as I applied brakes, I heard what sounded like gears grinding from the front wheels or transfer case as the rpms came down and continuing until the wheels stopped. I left the car in gear and both 4 low and 4 high, the PTU did make some sounds like some solenoid was engaging and disengaging, along with what sounded like maybe a piece of metal was popping around inside.
Anyone else experience the 4x4 symptoms as described above? Where do I start with the troubleshooting? What information am I leaving out that would be helpful?
THANKS!
_Matthew
I test drove it for 2 hours before I bought it. Obd scan came up clean with no pendings. First day after purchase I opened it up on the freeway and it threw a cylinder 8 misfire with the CEL flashing for about 10 seconds, and had some shift hesitation (only when accelerating from around 40mph) that was less a single hesitation, more like a series of attempts to find the gear until I punched the pedal to the metal. After inspecting/cleaning out the plug bay and coil, the pending code cleared and it hasn't come back. I know that people suggest a full plug and coil refresh, and I'd be astounded if that fixed the following symptoms with the 4x4:
In 4x4 low, I was experiencing some loud metallic clunking at random times, and almost always when braking. I also noticed less than stellar performance in the mud on a flat surface. I put the rig up on 4 jack stands and put it in 4 low and recorded what was happening; pressing the gas the first time caused all 4 wheels to turn. Letting up and pressing the gas again, I heard some low clunking, right front tire stopped spinning, and I could see the engine shaking in an unnatural way. In 4 high, I could get it revving up with the same grinding/clunking/engine shake but much more pronounced as the rpms increased, and this time as I applied brakes, I heard what sounded like gears grinding from the front wheels or transfer case as the rpms came down and continuing until the wheels stopped. I left the car in gear and both 4 low and 4 high, the PTU did make some sounds like some solenoid was engaging and disengaging, along with what sounded like maybe a piece of metal was popping around inside.
Anyone else experience the 4x4 symptoms as described above? Where do I start with the troubleshooting? What information am I leaving out that would be helpful?
THANKS!
_Matthew
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