45
votes
Accepted
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 ...
- 1,432
10
votes
Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?
It sounds like you already know why a gasoline engine keeps the fuel/air ratio as close to the stoichiometric ratio as possible, but just for the sake of information for anyone else:
The ...
- 2,055
8
votes
Accepted
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 ...
- 153k
6
votes
Driving car with half engaged clutch
To get us on the same footing, I'm going to assume by saying "clutch pressed halfway" you are suggesting the clutch be halfway engaged (meaning, you are still getting power from the engine, ...
- 153k
5
votes
Accepted
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 ...
- 153k
5
votes
Accepted
What is the effect of the throttle body on the power curve produced by the engine?
What exactly is a throttle body?
For a gasoline engine, the throttle body (TB) is the mechanism which controls the flow of air into a fuel injected engine. It is the "front door" if you will. Inside ...
- 153k
5
votes
Accepted
Big motorcycles at stop lights; why do they keep blipping the throttle?
Mechanically, it's a bit of a throwback to carburettor equipped bikes - my motorbike, for example, can be a little bit unforgiving when it's cold and it's not nice to go to pull away and have the ...
- 389
5
votes
Accepted
Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?
I am highly surprised that no one mentioned it specifically, but the answer is detonation. Poisson Fish was close, but extra wear from increased cylinder temperature isn't the main problem. The main ...
4
votes
Why might you choose to change to using an aftermarket throttle body?
One of the few reasons to change to an aftermarket throttle body is performance. The throttle body is a common bottle neck that may restrict air flow. This restriction comes from one of two places.
...
- 16k
4
votes
RPMs jump to 2500 when clutch is disengaged or transmission put in neutral
These are common symptoms of an split air hose allowing unmetered air into the engine intake. Check all air related hoses for cracks. Hoses include the main air intake, crank case ventilation system ...
- 24.8k
4
votes
Accepted
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 ...
- 14.4k
4
votes
Accepted
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 ...
- 10.7k
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 ...
- 3,336
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 ...
- 33k
3
votes
Accepted
My Toyota fails under full throttle but not when feathered
Hard to say with the information given. Sounds like retarted timing or not enough air or fuel (too rich / lean) . A repair manual will be infinitely useful in testing/troubleshooting.
Things to ...
- 8,443
3
votes
Accepted
2011 Infiniti G37 - Throttle Response Issue
Some throttle lag is normal on electronic throttle equipped engines. Most drivers do not notice it. But those who do often ask why. The lag strategy is done so that the fuel control system can stay in ...
- 11.6k
3
votes
Accepted
Should I give a little throttle after my car starts?
No, there are no benefits to giving your car throttle immediately after startup. This extra throttle will not recover the battery from the amount of power you just used to start the car any better ...
- 2,055
3
votes
RPMs jump to 2500 when clutch is disengaged or transmission put in neutral
As @handyhowie indicated, the source of the issue is more than likely unmetered air or simply an 'air leak'
This creates what's called a 'lean condition' for your engine. When you are lean in your ...
- 33k
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....
- 14.4k
3
votes
Accepted
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). ...
- 1,533
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 ...
- 425
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 ...
- 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 ...
- 153k
3
votes
Accepted
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 ...
- 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. ...
- 21
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 ...
- 14.5k
2
votes
Can the throttle position be high during idle
I don't know specifically about your car but in general it is possible. Some cars have a cam that opens the throttle plate when the engine is cold to increase the idle. My 99 Nissan Almera has such ...
- 15.7k
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 ...
- 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 ...
- 3,336
2
votes
Accepted
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 ...
- 211
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