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45 votes
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How come full throttle is meaning full speed instead of the opposite?

It is the difference between the verb and the noun. You are right, the verb throttle means to restrict - to slow down flow, therefore to fully throttle is to stop the engine. However, the noun ...
Chenmunka's user avatar
  • 1,432
8 votes
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Is there any difference between pressing the gas pedal and opening the throttle by hand?

If the engine is controlled via cable (drive by cable) directly from the gas pedal, then there is no difference if you were to open the throttle by hand and open the throttle plates. In fuel injected ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
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WOT uphill, no increase in RPM, consuming more gas?

I would bet the engine in your car is drive-by-wire, which means the computer is controlling the throttle, not you. In doing so, it is going to look at the load put on the engine and a bunch of other ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
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P2104 Throttle Actuator Control System Forced Idle error, but car runs fine

Double check your code, Mitchell doesn't list a P2104 for the Aveo. This code also seems to be specific to Fords. Problems with the TAC after jump starts are caused by the initial low battery voltage ...
Ben's user avatar
  • 10.7k
4 votes
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What could cause the throttle to stick in my Ford Ranger?

The time involved makes me suspect something heat related. I'd suggest opening up the hood and seeing if you can get access to the throttle body, it will probably look something like this: The ...
dlu's user avatar
  • 14.5k
3 votes

Does opening the throttle mean a leaner fuel to air mixture for starting?

No (or maybe more accurately – not for long), that is why you have a choke. Opening the throttle does allow more air in, but should also be causing more fuel to come in as well to preserve the mixture....
dlu's user avatar
  • 14.5k
3 votes

ITBs with a charged engine

At high RPM and wide open throttle, there is no significant differences between either one. Here a single throttle body might have a slight advantage since you have less turbulence in the intake ...
Netduke's user avatar
  • 425
3 votes
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ITBs with a charged engine

Yes there is a large benefit of response and efficiency and if not for the cost would likely be seen in more factory equipped vehicles other then the high performance production models (like BMW M3). ...
spicetraders's user avatar
  • 1,533
3 votes

Is there any difference between pressing the gas pedal and opening the throttle by hand?

As fair as I know, it is the same since the wire turns the throttle valve. The commanding wire doesn't do anything else, nor it has any other sensors/wires attached. It is a simple mechanism to act ...
Aram Alvarez's user avatar
  • 3,346
3 votes

2002 Yamaha YZF R1- Fault code 15

The fault code is related to your TPS Your TPS is a throttle position sensor. The fault code is not necessarily indicative of a broken wire although it could be. It sounds as though you have ...
DucatiKiller's user avatar
  • 32.9k
3 votes

Replaced throttle body - now horn won't stop honking

Well I figured it out. The issue was unrelated to the throttle body or any repairs I did. The problem was because I completely removed my battery. Upon re-installing the battery, the cars passive anti ...
Z W's user avatar
  • 225
3 votes

Full throttle and braking

To answer your question, it depends on the vehicle. If the vehicle has a lot of horsepower, it can overcome the brakes at high speed. As I stated in the comments, create a fail safe switch which will ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes
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How to remove this tightener?

You just undo it with a suitable size spanner or socket, probably 6, 7 or 8mm. It looks to be one of the few without a screwdriver slot or phillips screw head. If it is rounded or seized, I have ...
Solar Mike's user avatar
  • 34.6k
2 votes

Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?

If you mixed diesel with air before it entered the cilinder and then compressed it in a normal ( Diesel engine ) compression stroke it would certainly detonate before you reached top dead centre. ...
Pilot Snoopy's user avatar
2 votes

Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?

The other answers failed to note that the air-fuel ratio is dependent on the position you measure it at. So, even though the air-fuel ratio averaged over the whole cylinder is lean (so lean that ...
juhist's user avatar
  • 14.6k
2 votes

non reactive gas pedal

It could be a few things. airflow meter: could need a cleaning, most likely is partially disconnected or has a bad ground connection. Unplug it and replug it to verify the electrical connection, then ...
tlhIngan's user avatar
  • 12.2k
2 votes

non reactive gas pedal

When you suddenly push the gas pedal and the car doesn't react well, doesn't pickup but hesitates it means that uneven fuel mixture is getting in. Or the gas line pressure is low (clogged filter, bad ...
Aram Alvarez's user avatar
  • 3,346
2 votes
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Idle gets stuck at 2000RPM

I eventually got this problem fixed. For an unrelated issue, both the throttle position sensor and air flow meter were replaced on the car. When the same idle sticking issue persisted after that, we ...
Elliot B.'s user avatar
  • 211
2 votes

Is there any difference between pressing the gas pedal and opening the throttle by hand?

The short answer is "It depends". Paulster explained the most common caveats of drive by wire throttles, but my car is quite a bit different than that... In the early 2000's, BMW introduced a ...
Lathejockey81's user avatar
2 votes

Why Tachometer shows idle RPM range instantly when closing the throttle and clutching

From what I can understand, assuming the OP is curious as to why instantly pulling on the clutch the RPM goes down in a swift moment and not gradually? Simple: Inertia The reason for this is that ...
Shobin P's user avatar
  • 8,936
2 votes

Why Tachometer shows idle RPM range instantly when closing the throttle and clutching

It's a bit hard to understand your question, but I'm assuming you're asking about the RPM jumping between idle and back toward 5,000 when you disengage/engage the clutch. When you start the throttle ...
raydowe's user avatar
  • 3,012
2 votes

How can I rev a "drive by wire" car from under the hood?

Have a friend / relative help you. Only suggested as "use a brick etc" is not safe and you have to make sure you get the electronics correct otherwise you can permanently damage the ecu.
Solar Mike's user avatar
  • 34.6k
2 votes

Full throttle and braking

If I read your question correctly, you're really asking about how a brake booster works. I can tell you I've noticed a difference in braking in my manual when the RPM is higher (producing a stronger ...
Hari's user avatar
  • 781
2 votes
Accepted

Full throttle and braking

Firstly, I would strongly disrecommend against building a cruise control unit for your car, without having experience and completely knowing what you're doing; overriding the throttle with a self-made ...
Bart's user avatar
  • 2,954
2 votes
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Why do we need coolant in throttle valve body inlet in Opel Astra H?

The reason they have coolant running through the throttle body is to prevent frosting in cold weather. If you live in a warm weather area, you can bypass this in most cases. One of the problems with ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Gas pedal floored yet the car can't reach maximum speed

I think I have enough data for an answer, so I'll provide it here instead of as comments. 200 km/h from a 100hp engine is way too much. Solar Mike noticed that the particular engine has 186 km/h top ...
juhist's user avatar
  • 14.6k
2 votes
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Is it normal to have a slightly open throttle-plate?

Most if not all butterflies on throttle bodies do not close all the way. It stays open to a predetermined gap. The IAC further regulates how much air to increase or decrease as needed to maintain ...
Jupiter's user avatar
  • 3,330
2 votes
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Ideal TPS Voltage Range for calibration

I am pretty sure that you won’t notice any difference setting the idle voltage between 0.4v and 0.6v. The ECUs don’t use this reading for doing any accurate measuring, it is used to give the ECU an ...
HandyHowie's user avatar
  • 25.4k
2 votes

Bmw e43 320d revving itself to verry high rpm

This sounds like what is typically called a diesel runaway. Since all diesel engines need to keep going is fuel and air, it can easily happen if there's a problem with the turbocharger leaking oil. As ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

Why is the throttle on my motorcycle jumpy?

It's hard to say exactly from your description, but it does sound like it could be a throttle cable issue, which could be dangerous depending on what's actually wrong. It could be that it's just loose,...
GdD's user avatar
  • 17k

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