Starting Vehicles: Gears Engaged or Not?

  • Thread starter akhand121
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In summary, certain vehicles with manual transmissions can be started by keeping the gears engaged while others, particularly those with automatic transmissions, cannot. This is known as a "push start" and relies on the ability to engage the gears and crank the engine while the car is in motion. However, this method may not work if the car has an electronic ignition system or a rear pump on the transmission. Additionally, some GM transmissions from the 1960s may have a feature called "grade retard" which can also affect the ability to push start the car.
  • #1
akhand121
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certain vehicles can be started by keeping the gears engaged while certain others cannot...how ?
 
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  • #2
Specify which types of vehicle can be started with gears engaged.
 
  • #3
akhand121 said:
certain vehicles can be started by keeping the gears engaged while certain others cannot...how ?

Are you referring to what is known as a "push start"? This is where you push the car to get it rolling and then engage the gears to crank the engine.

If so, this generally only works if you have a manual transmission. Automatic transmissions usually have a pump that is run off the engine. If the engine isn't already running, the transmission won't engage the gears and the car effectively stays in neutral.

Another reason that you might not be able to push start a car is if it has a electronic ignition system. If the battery is completely or nearly complete dead, it won't have enough juice to run the system and at the low speed the engine turns during a push start, the alternator won't either.
 
  • #4
On automatic transmissions, you will have to have a "rear pump" driven by the output shaft.

Some GM transmission of the early 60s had what is called "grade retard" which was found in the dynaflow and turboglide.

Some versions had a rear pump.
 
  • #5
I have a manual transmission. I have been able to move the unresponsive car by engaging lowest gear and operating the ignition and starter motor. Sometimes it then jumps to life, and one can carry on as if nothing had happened!
 

1. What is the purpose of engaging gears when starting a vehicle?

Engaging gears when starting a vehicle allows the engine to transfer power to the wheels, which allows the vehicle to move forward or backward. It also helps control the speed and direction of the vehicle.

2. Can I start the vehicle with the gears already engaged?

No, it is not recommended to start a vehicle with the gears engaged. This can put unnecessary strain on the engine and transmission, potentially causing damage.

3. Is it okay to leave the vehicle in gear when parked?

It is generally recommended to shift the vehicle into neutral when parked. This reduces strain on the transmission and makes it easier to start the vehicle. However, some vehicles have a safety feature that requires the vehicle to be in gear in order to start.

4. What should I do if the vehicle stalls while in gear?

If the vehicle stalls while in gear, you should first try to restart the engine while in neutral. If that does not work, you may need to push the vehicle to a safe location and check for any issues with the transmission or engine.

5. Can I switch gears while the vehicle is in motion?

Yes, you can switch gears while the vehicle is in motion. However, it is important to do so smoothly and at an appropriate speed. Abrupt gear changes can cause damage to the transmission and affect the vehicle's performance.

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