Flatwatr
Member
- Joined
- February 22, 2019
- Messages
- 24
- Reaction score
- 0
- City, State
- Johnson City, TN
- Year, Model & Trim Level
- 2007 Sport Trac Limited
I am experiencing an pulsing shutter issue which feels like running through the Rumble Strips you might associated with the approach to traffic signal. This shutter occurs at city street speeds usually in the 1500 to 1800 RPM with just the slightest acceleration to maintain say, 35mph. There is an correlating oscillation in the tac at instance of the shutter; the RPM increases slightly. If I accelerate above this RPM, it goes away. If I drop out the OD, the RPM increases and it goes away. The engine idles smoothly, acceleration is great, the gas mileage, although unimpressive, doesn't seem to suffer, but it can evolve into a violent jerking if coaxed. I want to think there is an input error at which point the transmission can't decide to downshift or stay in 6th gear.
Now that I've described the issue, I'll admit, I've had this addressed three time in the span of 43K to the present 123K. The first two times the issue was corrected by a Ford dealership, and although I can't find the service reports, I was certain the issue was Plug related. This time the technician says the analyzer shows not engine issue and wants to replace the rear shaft assembly. Got any thoughts?
Now that I've described the issue, I'll admit, I've had this addressed three time in the span of 43K to the present 123K. The first two times the issue was corrected by a Ford dealership, and although I can't find the service reports, I was certain the issue was Plug related. This time the technician says the analyzer shows not engine issue and wants to replace the rear shaft assembly. Got any thoughts?