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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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10
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3answers
3k views

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. ...
9
votes
1answer
5k views

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 ...
8
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7answers
6k views

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 ...
8
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2answers
2k views

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 ...
8
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2answers
2k views

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'...
7
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2answers
211 views

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. ...
6
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2answers
5k views

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 ...
6
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2answers
5k views

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 ...
6
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1answer
2k views

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 ...
6
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5answers
47k views

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 ...
5
votes
3answers
6k views

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 ...
5
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1answer
247 views

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 ...
5
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1answer
583 views

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 ...
5
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1answer
1k views

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 ...
4
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1answer
809 views

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 ...
4
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1answer
196 views

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 ...
4
votes
1answer
940 views

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 ...
4
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3answers
1k views

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 ...
4
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2answers
1k views

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, ...
4
votes
1answer
3k views

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 ...
4
votes
1answer
4k views

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 ...
3
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3answers
777 views

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 ...
3
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2answers
172 views

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 ...
3
votes
1answer
2k views

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.
3
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1answer
319 views

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 ...
3
votes
1answer
673 views

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 ...
3
votes
1answer
566 views

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 ...
3
votes
1answer
704 views

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 ...
3
votes
2answers
641 views

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 ...
3
votes
1answer
486 views

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 ...
3
votes
2answers
482 views

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 ...
3
votes
1answer
187 views

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 ...
3
votes
2answers
1k views

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 ...
3
votes
0answers
61 views

What could cause an MPFI engine to balk when the throttle is opened?

I'm on the engine 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 ...
3
votes
1answer
1k views

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 ...
2
votes
2answers
2k views

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 ...
2
votes
2answers
112 views

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 ...
2
votes
1answer
2k views

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 ...
2
votes
1answer
899 views

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 ...
2
votes
1answer
1k views

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 ...
2
votes
1answer
97 views

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 ...
2
votes
1answer
97 views

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 ...
2
votes
1answer
985 views

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 ...
2
votes
1answer
277 views

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 ...
2
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0answers
56 views

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 ...
2
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0answers
16 views

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 ...
2
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0answers
105 views

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 ...
2
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0answers
447 views

1996 Mazda Soho 1.3 - Idle throttle control valve acting up

I bought a Mazda Soho 121 roughly a year ago, that had an idling problem. After tracing the issue down to the idle control valve (idle would jump from 500rpm to 3500 rpm every second or two), I ...
2
votes
1answer
1k views

Repairing of electronic throttle control

I am the owner of an Opel Astra G Caravan (This is the European name, don't know how it is in USA) from year 2007. It has an 1.4 Twinport engine Z14XEP and a manual gear. A few days ago I noticed ...
2
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0answers
138 views

Does “slogging” an engine (open throttle at very low RPM) increase mechanical wear? [duplicate]

When I was taught to drive, I was told that "slogging" the engine - open throttle at low RPM, e.g. 1000 RPM - was bad for it. Particularly when driving up a hill as that means you'll be stuck at that ...