Hi.
Problem is the automatic transmission. You have either a bad throttle position sensor, a bad speed sensor, a problem with TCM (transmission control module, or a problem with transmission solenoid.
The first action is doing a code scanning. A partial code scanning can be done for free at Autozone. Autozone can only do a scan on the main computer, which will may return a code P0700 (see code p0700 after an OBDII scan.) P0700 means that an additional scan must be done on the transmission dedicated module. If there is a code P0700 (do free test first), a full scan canl be done at the dealer or at an authorized using a different scan tool. A mechanic scanning the TCM will help more than saying "I do not know". Standard charge is $80.
If there are no codes the parts that can be responsible must be tested.
Before doing anything else, check transmission fluid. If it is dark brown or if level is low, replace it.
The most common fault causing the
problem is a defective TPS ( throttle position sensor). Test must be done using a multimeter.
The TPS can be tested by reading volts at its terminals while someone else is pushing down the accelerator pedal. If voltage has gaps (in your case this is likely the result), or if voltage does not change smoothly, then the TPS must be replaced.
Other part that can be responsible is the speed sensor, mounted on the transmission. This part is more difficult to test, and gets usually replaced.
The transmission is operated by an array of solenoids called solenoid pack. The solenoids are located inside transmission, in the valve body. The solenoids are tested using an Ohm meter.
Wiring to solenoid pack must also be checked reading volts while problem happens (mechanic will put car on lifter).
If there is nothing else, then the TCM itself (a computer) may be itself the culprit. Before replacing the module, it must be tested. First part to check is its grounding and the connector pins.
As said, the culprit is likely the TPS. That is the first part to test. Do also a code scanning to see if there are codes stored.
Regards.
Ginko
Hi When the car stalling while accelerating, the possible cause is that the car is suffering from a vacuum leak. Vacuum leak often start out small and gradually becomes worst due to pressure inside the car engine. The vacuum created in the car fuel system is one of the key factors in determining how much fuel the car engine will get, any leak in the car fuel system vacuum will affect the air/fuel mixture that enters the car engine combustion chambers, and this will result to car stalling. In this case you do not have any option but to bring the car to a reputable auto repair shop and ask the mechanic to check the car for a vacuum leak, particularly the EGR and the PCV valves, as this two items are often to be the source of vacuum leak. When car stalling is not gradually become frequent over time and also occurred not only during cold wet weather, the only possible problem of the car is a bad throttle position. Fuel injected engines have a throttle position sensor, a device which measures how far a driver pressed the gas pedal and thus the throttle. The position sensor feeds the data to the engine computer that does the calculation the resulting data is used to determine precisely how much gas the fuel injection system should inject into the engine. If the throttle position sensor provides a wrong data to the engine computer it will adversely affect the injection of gas into the engine causing the car to stall when accelerating. When the car stalling is gradually frequent as the first time it was happened, the possible cause is that the car is suffering from a vacuum leak. Vacuum leak often start out small and gradually becomes worst due to pressure inside the car engine. Check your car throttle position sensor to a reputed auto shop. Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com
SOURCE: I have a 2005 Lincoln LS with 35000 that is
It sounds like to me you have a faulty Accelerator Pedal Position Sensor. You can get these at www.rockauto.com cheaper then anywhere else.
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The car does not stall. It is as if you were accelerating with the car in neutral. RPM's rise but the car does not move for a few seconds and then lurches forward as if you threw the car into drive from neutral while pressing the accelerator. Make sense?
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