What does hard downshift on a car mean?
The hard downshift is a quick rise in rpms just before coming to a complete stop- it revs higher and the vehicle surges a little before settling into 1st gear. As the engine warms up the surge at a stop becomes less noticeable and within 2-3 minutes is gone completely, usually for the rest of the day…
How does a downshift solenoid work in a car?
They operate using hydraulic pressure to shift the gears, and use electronic solenoids to regulate the pressure of the transmission fluid to control the shifting points. One of these electronic solenoids are the downshift solenoids.
When do I get a hard downshift from 2nd to 1st?
I get a hard downshift from 2nd to 1st only when the engine is cold – especially noticeable in cold weather. After a mile or so of driving (or a few minutes of idling) is shifts fine. All upshifts are fine all the time. The tranny fluid level is fine and is in good condition.
What are the signs of a bad Shift Solenoid?
One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. If the downshift solenoid has any issues, it may cause the vehicle to behave erratically when downshifting. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop.
Can a bad throttle position sensor cause idle surging?
Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light
How does acceleration affect the gear transmission system?
The issues with acceleration can lead to gear transmission problems as the ECM doesn’t get the correct information about the acceleration. This leads to incorrect shift points which can cause both early or delayed shifts.
What causes idle surges on a car ECM?
Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges.
How does the throttle position sensor work in a car?
The throttle position sensor is what monitors the throttle position from the shaft. Basically, this sensor is connected to a computer inside the vehicle which shares information sent by the driver. This information contains the actions of the driver such as accelerating, power steering and so forth.