Umair Gaines
Manually revving an electric throttle can be a tricky task. In older cars, it was possible to grab the accelerator cable and goose the throttle. However, with newer cars, it's a different story. Most modern cars are drive by wire, meaning the throttle pedal works on a potentiometer that tells a motor how far to open the throttle body. As a result, attempting to manually move the throttle plate in newer cars can damage the ECU. So, what's the solution? One option is to have a friend or relative sit in the driver's seat and give the car gas while you listen. Alternatively, if you have wiring diagrams and knowledge of how the throttle motor works, you could feed the ECM TPS signals and power/ground the motor with a variable resistor.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Cars manufactured after 2000 | Cannot be manually revved from under the hood |
| Cars with electronic throttle bodies | Cannot be manually revved |
| Cars with drive-by-wire | Cannot be manually revved |
| Cars with a throttle cable | Can be manually revved |
| Cars with a throttle body under plastic covers, sensors, and servos | Cannot be manually revved |
| Cars with wiring diagrams and knowledge of throttle motor | Can be manually revved by feeding the ECM TPS signals and powering/grounding the motor with a variable resistor |
| Cars with an accelerator cable | Can be manually revved |
| Cars with an air intake tubing connected to the throttle body | Can be manually revved by pulling the cable and armature |
| Cars with 1 or 2 cables hooked up to the arm of the throttle body | Can be manually revved by pulling the cable and armature |
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What You'll Learn
Locate the throttle body
Locating the throttle body is the first step to manually revving an electronic throttle. The throttle body is a vital component of the engine, and keeping it clean is essential to the smooth functioning of the vehicle.
The throttle body is located between the intake manifold and the air cleaner. It is usually found at the front of the engine, and has a large tube connected to it. The throttle body is connected to the air filter box with a large hard plastic tube. The throttle body will be the first aluminium casting the air intake pipe is attached to.
To locate the throttle body, you can also ask someone to press the accelerator with the engine off. The throttle body has a direct connection to the gas pedal via a cable or link. When the gas pedal is pressed, the throttle shaft will move, and this movement can be observed.
Once the throttle body is located, it is important to carefully remove any objects blocking access to its removal. Basic tools like a small socket, flat-blade screwdriver, or spring clamp tool can be used to loosen the clamp on the hose connecting the throttle body to the air intake hose. It is also important to note that the throttle body is a delicate electronic part, and caution must be exercised while handling it.
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Identify the cable attached to the throttle body
The throttle body is a component that varies the amount of air entering an engine. In an electronically fuel-injected car, the throttle body is connected to the gas pedal either mechanically with a cable or electronically by wire. When the gas pedal is depressed, the APP sensor resistance and voltage values change, and the throttle body opens to let more air flow into the manifold.
To identify the cable attached to the throttle body, follow these steps:
First, locate the throttle body by following the air intake tubing from the air filter back to the rear of the engine bay. The throttle body should be where the air intake tubing stops.
Once you have located the throttle body, you should see either one or two cables hooked up to the arm of the throttle body. Some cars may have a cover over the throttle body to protect it from debris, so you may need to remove this cover to see the cables clearly.
If you are having trouble identifying the correct cable, you can try the following:
- Have someone sit in the driver's seat and hit the gas a little bit while you watch the throttle body to see which part moves. This will help you identify the cable and armature that you need to move to rev the engine.
- Alternatively, you can try removing any covers or guards over the throttle body and cutting a hole in the mat directly above it to prevent debris from falling into the throttle workings. Then, have someone work the gas pedal with the car in park or neutral, and watch to see which part moves after the cables. Grab that part and move it in the same way it moved when the gas pedal was depressed.
It is important to note that some modern vehicles may not have a cable attached to the throttle body. Instead, the computer controls the throttle body based on the accelerator pedal position, and all throttle movements are controlled by the PCM or ETC module.
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Pull the cable and armature to rev the engine
To rev the engine of your car, you need to locate the throttle body. This is usually connected to 1 or 2 cables (or 3 if your car has cruise control). These cables are attached to the arm of the throttle body.
If you want to manually rev the engine, you can do so by pulling on the cable and armature. Place your finger on the top and back of the arm and pull it towards you. This will rotate the arm and rev the engine.
Alternatively, you can grab the accelerator cable with your hand and move the throttle manually. However, this may not be possible in newer cars that are "drive by wire", where the throttle is controlled by a computer and sensors rather than a cable.
It's important to note that manually revving the engine can be dangerous and may damage the engine or electronic control unit (ECU) if not done correctly. Always refer to your car's manual or seek professional advice before attempting any repairs or modifications.
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Avoid revving past 3000 rpm
Revving your car's engine past 3000 rpm can cause significant wear and tear on the drivetrain, especially if done continuously. It is also a good idea to avoid revving past 3000 rpm when releasing the clutch, as this can cause the clutch to slip and wear out more quickly.
Some cars are designed to limit rpm when the clutch is out and not moving. For example, the G37s cannot rev past 3000 rpm in neutral with the clutch out. If your car is struggling to rev past 3000 rpm, it could be due to a faulty switch or vehicle speed sensor signal, causing the car to think it is in neutral and limiting your throttle.
If your car won't rev past 3000 rpm, it could be due to a number of issues. For instance, a diesel Kia Ceed 1.6 CRDI may need a new fuel filter, as the factory fuel filter is prone to airlocking. Alternatively, it could be a restriction in the exhaust or a lack of fuel pressure. Other potential issues include low oil levels, faulty crankshaft or camshaft sensors, or a faulty throttle.
To avoid revving past 3000 rpm when starting in first gear, you should try to match releasing the clutch with applying the throttle. You should lift your foot up to the engagement point quickly, then slow down as you feel the engagement start. This will allow you to release the clutch more quickly and smoothly without revving the engine too high.
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Get assistance from a friend or relative
If you need to manually rev the engine of a car with an electronic throttle body, you will not be able to do it alone. This is because modern vehicles have electronic throttle bodies or "drive by wire" systems, meaning there is no physical linkage or cable to move. Therefore, the only way to rev the engine is to get assistance from a friend or relative.
Step 1: Ask your friend or relative to sit in the driver's seat of the car. They will be responsible for giving the car gas while you work under the hood. Make sure they are comfortable with the task and understand the importance of following your instructions carefully.
Step 2: Before beginning any work, make sure the car is turned off and the keys are removed from the ignition. This will prevent any accidental activation of the electronic throttle control (ETC) system.
Step 3: Familiarize yourself with the wiring diagrams of the throttle motor. Understand the voltages it expects and how the ECM TPS signals work. This information is crucial to ensure you don't accidentally damage the ECU.
Step 4: With your friend's help, feed the ECM TPS signals and power/ground the motor with a variable resistor. This will allow you to control the throttle response without physically accessing the throttle body.
Step 5: Communicate clearly with your friend or relative throughout the process. Instruct them to slowly apply pressure to the accelerator pedal while you listen and observe the engine's response.
Step 6: Pay close attention to the engine's behaviour as your assistant applies gas. Listen for any unusual noises and observe the RPM gauge to ensure it responds as expected.
Step 7: Once you have finished your diagnostics or adjustments, remember to return the car to its original state. Ensure the accelerator pedal is in the resting position and that all tools and equipment are safely removed from the engine bay.
Remember, working on a modern car's throttle system can be complex and potentially dangerous if not done correctly. Always prioritize safety and consult a professional mechanic if you are unsure about any aspect of the process.
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Frequently asked questions
You can follow the air intake tubing from the air filter back to the throttle body, which has a cable attached. Pull this cable with the engine running.
You should have either 1 or 2 cables (2 if you have cruise control) hooked up to the arm of the throttle body. If you see 3, you're looking in the wrong spot.
You can have someone sit in the driver's seat and hit the gas a little bit. Then, look for the part that moves and that is the part you need to move to get your car to rev up.
If you have wiring diagrams and you know how the throttle motor works, you could feed the ECM TPS signals and power/ground the motor with a variable resistor.
Yes, most cars manufactured after 2000 are "drive by wire", meaning there is no cable to the throttle and the throttle is controlled by a computer and sensors.
