What would cause the cruise control on my 1996 E-350 7.3 powerstroke diesel to not hold a steady speed ? It has a consistent very quick fluctuation with the speed set at 70 mph (speed moves up and down within 2 mph very very quickly back and forth and can feel it ....very annoying) . Almost acts like its "missing" or like the fuel filter is plugged (i know its not that though) When i shut it off vehicle runs perfectly.
2007-01-13 08:53:23 · 3 answers · asked by sm 1 in Cars & Transportation ➔ Car Makes ➔ Ford
To diagnose this would require access to a scan tool that can perform "self-tests", and read data. NOT those cheesy code readers that most DIY buy from Auto Zone to read codes. The cruise control system on your particular vehicle is built into the PCM (powertrain control module). Engine speed, or fuel delivery is controlled by the IDM (injector driver module). Does your vehicle run rough, or stall intermittently? I have heard of problems with water intrusion into the IDM on a few occasions. The module is located on the far driver side, inside the engine compartment just behind the coolant de-gas bottle or reservoir. Check to see if water is leaking onto the main electrical connector to the module.
2007-01-13 16:33:31 · answer #1 · answered by Anonymous · 0⤊ 0⤋
You probably need to re-calibrate the processor if it's electronic speed control
2007-01-13 10:40:37 · answer #2 · answered by kayef57 5 · 0⤊ 0⤋
pinhole in the vaacuum control diaphram
2007-01-13 08:58:04 · answer #3 · answered by toadyboy 4 · 0⤊ 1⤋