Questions tagged [throttle]
Questions and discussions about a throttle. The throttle is a valve that controls the amount of air that is allowed to pass into a gasoline engine (diesel engines do not have a throttle in this sense).
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How come full throttle is meaning full speed instead of the opposite?
I am stumbling about full throttle. To throttle usually means to brake down or slowing down. Technically it is a flap which is reducing the air delivery which is important for the combustion process.
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Is there any difference between pressing the gas pedal and opening the throttle by hand?
In a typical modern, heavily computer controlled, somewhat complex passenger car, is there any difference between pressing the gas pedal vs. opening the throttle valve under the hood by hand?
E.g. ...
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Idle gets stuck at 2000RPM
I have a friend with a 1989 Toyota Camry Wagon and the idle occasionally gets stuck at 2000RPM. In order to get the idle unstuck, we have to press down the gas, kick up the revs and then it will ...
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Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?
This simple question has been bugging me for a while. The amount of fuel injected into a petrol engine is calculated according to the amount of air entering through the throttle valve (as measured by ...
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ITBs with a charged engine
Are there any benefits of running independent throttle bodies with a super/turbocharged engine, as opposed to running a single throttle body on the same engine?
If so, what are the benefits (and how ...
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Gas pedal stops responding after driving for some time
My daughter has a 2005 Jeep Liberty Sport. She drives it to school daily and then home after school with no problems. But, if she uses it to run around town on errands it starts but the gas pedal won'...
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How much oversize should you target when choosing a throttlebody?
This is in addition to my previous question about throttle bodies. I know it may sound a bit subjective, but I think it has a clear technical aspect, and I have done a considerable amount of homework.
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RPMs jump to 2500 when clutch is disengaged or transmission put in neutral
Good morning all. I drive an 05 Chevy Cavalier, 2.2L, 5-spd manual trans. Lately I've been having issues which I am told is throttle related. As I'm driving for a little bit (time varies) I go to ...
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What could cause the throttle to stick in my Ford Ranger?
I have a 1999 Ford Ranger pickup with about 242,000 miles on it. After driving for 10-20 minutes the throttle will start to stick when I take my foot off the pedal. After a couple seconds, the engine ...
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What is the effect of the throttle body on the power curve produced by the engine?
I heard from another member of this community that the throttle body, among other things, has the ability to change the power curve of the engine.
What exactly is a throttle body?
How might the ...
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Car turns off due to low RPM, only when starting car
Background:
I had my 2003 Infiniti g35 at the mechanic to fix an electrical problem (turns out remote starter wires were rubbing and causing a short) and to fix an oil leak. All in all they changed ...
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Why are drive by wire systems so unresponsive?
Purchased a honda Fit seeing their reasonable price and good engine power.
However I have a lag between me pushing the pedal and the engine responding. I constantly have to downshift to get any power ...
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WOT uphill, no increase in RPM, consuming more gas?
I own a city car Chevrolet Spark 2016. When going up a steep hill say in 4th gear, having the throttle down at 60% or WOT is practically the same. There's a minimal increase in RPM and power. Will the ...
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How can I rev a "drive by wire" car from under the hood?
I've got a 2013 Hyundai Accent with a noise coming from somewhere under the hood. Happens only at a fairly narrow band of engine speed (1100-1200 RPM). I've been trying to hunt around for the source, ...
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I lubed a sticky throttle and now it's worse, but only in the cold
I've been teaching my friend to drive stick on my Subaru 2004 Impreza Outback Sport, and the gas was a little sticky/crunchy, so it was hard to give just a little gas. It was either none, or a little ...
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Should an automatic drop gears while driving flat without using any pedals, or should it cruise?
I fixed a problem with my accelerator pedal, which caused a different unexpected change to how my automatic behaves. Since it's my first automatic (I normally drive manuals), I want to know which is ...
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2002 Altima: Battery and Gas Pedal Issues Same Week
Car Info: 2002 Nissan Altima 2.5L with about 140k miles on it.
The symptoms: On Tuesday of this week the car is in a parking lot, we return to the car, it starts and idles but when the accelerator ...
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Replaced throttle body - now horn won't stop honking
This is the final question to my DIY ford ranger repair series. You can see the first two here:
1) Is hot desert weather the source of my recurring car problem
2) Procedure for throttle body and idle ...
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2002 Yamaha YZF R1- Fault code 15
I have fault code 15 on my display. Checked the TPS, it has the right resistance on all cables combinations. Also correct voltage on yellow - black when its attached to wire harness and the ignition ...
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Can the throttle position be high during idle
I used an OBD to get data from one of my friend's car - Volkswagen Polo 1.5L Diesel. But the car was idling at around 900 rpm, while the throttle position I got was around 22%. How is it possible? As ...
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2011 Infiniti G37 - Throttle Response Issue
When I step on gas in my G37 the throttle response is a bit lagged. It has increased ever so slightly over the past 6 months. Can someone explain what the cause of this might be and any preventative ...
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Bmw e43 320d revving itself to verry high rpm
I have a big problem whit my 2.0 Bmw e46 320d.
The problem is that I was driveing one night and the car gust started revving by itself around 7k rpm the car had so much boost at the time that I almost ...
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What controls the rate at which the revolutions decrease when gas pedal is released at neutral?
I am just wondering about the general idea. So, when I do not have any gear put in and increase the revs to let's say 4000 rpm and then remove my foot from the gas pedal the revolutions go down ...
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Kawasaki ZZR600 - Engine idles ok. Choke ok. Cuts out when open throttle. Possible causes?
I have a 20 year old Kawasaki ZZR600. She was running fine in December. I didn't ride her for a few weeks in January. Left the battery on maintenance trickle charge.
A few weeks or so ago I fired her ...
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non reactive gas pedal
My daughter has a 2008 PT Cruiser. For months she has had the problem of "when she pushes on the gas pedal it doesn't work and the car jerks back and forth." Those are her words. We have taken it ...
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Big motorcycles at stop lights; why do they keep blipping the throttle?
We've all been near a big Harley at a stop light, where the rider keeps blipping the throttle. I've always wondered why they do this. Is it because those big pistons don't idle very well, and if you ...
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Yamaha fz700 handlebar bent
Bike got tipped over by a random person, handlebar got bent, and throttle is really hard to move now so I decided to try to take it out to see what I could do. Here is a picture of the bar:
You can ...
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Is there a way to tighten the throttle cable on a 2004 Echo?
Curious whether it's possible and how to do tighten up the throttle cable on my 2004 Toyota Echo manual.
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Idle sometimes too high (BMWM50B25TU)
Yesterday I had to drive a lot and after 100 miles I noticed that the idle won't go below 1500 rpm (should be 600) on my 1993 BMW 525i (euro model), except when I drove slowly in a high gear.
This ...
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P2104 Throttle Actuator Control System Forced Idle error, but car runs fine
2 days ago, I had to jump start my 2009 Chevrolet Aveo. I suspect I left the interior light on all night which drained the battery. After I started the car, the engine warning indicator was on. (It ...
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Does opening the throttle mean a leaner fuel to air mixture for starting?
As per the title, if I'm starting a motorcycle or lawnmower or something similar with a carburetor and I know the mixture is too rich, does opening the throttle lean the mixture out?
I've got a ...
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Mazda 323: Does the EMU / ECU learn?
I have a Manual 97 Mazda Lantis 323 1.8L DOHC 16 Valve BP and was wondering if the EMU / ECU on it learns? Could unplugging the battery to reset it help some of my problems with erratic idle? I found ...
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Seat Toledo engine stalls when warm
I have a 2001 1.6 16v Seat Toledo.
Short story:
My car randomly stalled when the engine warmed up to operating temperature and I could not restart until it cooled down. A mechanic cleaned the ...
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2000 Yamaha R1 Quick Action Throttle
I've 2000 Yamaha R1 that I'm racing in my local Clubman's Championship. At the moment the throttle travel is very long, ie. half a turn or more from fully closed to fully open. I want to change this ...
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Poor idle speed when engine is warm
I drive a Mitsubishi Eclipse 2000 2.4L.
In the past few days my car has started to idle horribly when the engine warms up. While it is cold, the rpms seem to be normal except for a small fluctuation ...
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What could cause an MPFI engine to balk when the throttle is opened?
I'm on the Indian sub-continent. The vehicle in question is a Maruti 800 MPFI ; motive power is provided by a Suzuki F8 engine. The vehicle was purchased new, and has been regularly serviced. The ...
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Stiff Gas Pedal 03 Corolla
I have an '03 Corolla with about 87k miles on it. I just bought it a while ago and everything on it seems to run perfect. Recently I've been a bit conscious of how I drive and accelerate and noticed ...
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Why might you choose to change to using an aftermarket throttle body?
I have heard that some people might want to buy an aftermarket throttle body.
Is the reason for this simply to replace a broken one or are there also other specific advantages (and disadvantages) to ...
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My Toyota fails under full throttle but not when feathered
My car is a Toyota MK4 NA Supra and it has a problem I don't understand. When I push the throttle gently, whether in park or in drive, it gradually builds revs and moves but when I push it hard i.e ...
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Mazda 3 2004 Engine Revving when car not moving
I recently noticed when my car comes to a stop engine running and ac on the engine revs as if it wants to move forward. The rev isn't huge. When i am in traffic and holding down on the brakes, if i ...
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Issue w/ weedeater engine - doesn't stay on
So, here's the problem. I'll prime my weedeater, put full choke on, pull the cord a few times. Now, BEFORE, the engine never started with full choke. I would need to move it to half choke, pull the ...
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Throttle randomly gets stuck in closed position
I recently did some work on my throttle body (had it removed, cleaned all the valves, etc.) and after I put it back together I noticed something strange. Every once in a while, after the car has been ...
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1997 Pontiac Sunfire not accelerating past 40mph
Problem Details:
My 1997 Pontiac Sunfire will turn on but I need to leave it cranking for a bit and give it a little gas, it can run, but when I try to accelerate past 40mph, the revolutions drop ...
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Unknown Capacitor required
I have an automotive electrical issue I am having trouble with, the injection ECU is reacting to the throttle position sensor too quickly and shutting the fuel off on a trailing throttle too early ...
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Automatic Throttle Body and TPS on a Manual
This is in continuation to my question Fast Idle and High Fuel Consumption. I just bought a Manual 97 Mazda Lantis 323 1.8L DOHC 16 Valve BP ( apparently called a Protege in the US ) which has a fast ...
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New 2.5 hp outboard motor has reduced power at full throttle
I have a new 2.5 hp 4-stroke Mercury outboard motor on a 12-foot aluminum boat:
I've used the motor four times; 15 km per trip.
When I first got the motor, it seemed to have a lot more power at full ...
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2014 Ninja 300 idle/throttle issue
Back Story
Recently my bike had an issue twice while riding that the throttle seemed like it was sticking. I'd be accelerating and when I let off the throttle, it would continue to accelerate. It ...
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2000 Sierra 1500 4.8L Engine not revving properly for several minutes after start
For the past couple weeks I've been consistently having a weird issue with my 2000 Sierra 1500 4.8L when I first start it up.
The engine will start and idle fine, but when I give it gas the engine ...
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06 Jeep Cherokee 8cyl; Auto transmission
It seems that I am annually having to replace the “map sensor” and various parts associated with that. Last week I replaced it again, and next will be the “auto throttle body” or something with the ...
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I have Vespa sxl 150 scooter.It behaves strange while giving aceleration
It may sound funny but i found this after several days. While moving towards west the scooter works well and easily reaches 100 km/hr. But when moving towards east the scooter never go above 85 ...
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