At around fifty mph, when car is at operating temperature, it seems to “hesitate” for a second, then stop, then hesitate again, etc. Until speed is below fifty mph. This has been happening for over six months now.
The engine or, is not hesitating though. I was watching the tachometer and when it seemed to hesitate, the rpm were actually jumping up about 150-200 rpm.
When the engine is cold on the same stretch of road, under the same fifty mph conditions the “hesitating” is not as prevalent.
Parts replaced within five thousand miles:
coil, OEM (Bosch) spark plugs, catalytic converter, both O2 sensors, spark plug wires, air filter
There is no CE light on.
There are no CE codes showing. I am using a Bluetooth OBDII and a tablet with the Torque Pro app.
I was at the dealer and they ran a diagnostic, and came up with nothing but a suggestion, “install the OEM plugs”. I did that, and it did nothing but make my wallet thinner.
I checked the fuel trims (from another web site) also, and was told that they are within the correct parameters.
What could it be?
have the same problem?
Wednesday, February 15th, 2017 AT 3:14 PM