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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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Throttle Body is not close/open smooth?

i have hesitate RPM . today i check my Throttle Body and i think is not close/open smooth. its feel lag when pressing pedal slowly. or its okay? what you think? Visit https://www.youtube.com/watch?v=...
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3answers
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How to remove this tightener?

This is alfa romeo giulietta, in front of the throttle body.
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1answer
24 views

Ranger putting oil inside the exhaust

My Ranger 2.2 Diesel 2013 model puts oil inside the exhaust and therefore discharges excessive smokes from the exhaust.
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My 2010 Jaguar XK will very occasionally struggle to accelerate only when starting from low speed

new to the forum! My 2010 Jaguar XK will very occasionally struggle to accelerate when I am running it at low speeds of about 10-15 mph. When I try to go above 10-15 mph, the car will create a lot of ...
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1answer
53 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 ...
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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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3answers
474 views

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

I'm running a manual Opel Corsa 2005 Sedan (engine code: C16SE, 1600cc). The problem I'm encountering is that the car won't reach its maximum speed of 200km/h as similar cars do. Instead, it stops ...
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1answer
52 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 ...
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1answer
355 views

Why do we need coolant in throttle valve body inlet in Opel Astra H?

Opel Astra H has an electric driven throttle valve. As I know, coolant in throttle valve body would control bimetal plate responsible for warming up. Why can't it control warm up process based on ...
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Losing throttle on highway 2017 Mini Cooper

So today I was driving towards work like usual but all of a sudden when trying to overtake someone I lost throttle, I could shift perfectly fine but I was unable to give it throttle. So I turned on my ...
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5answers
185 views

Full throttle and braking

I plan to implement a cruise control system on my old car using an arduino, using info from the speed sensor it will control the gas pedal etc.. I know I known, safety first.. I will be doing a lot ...
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1answer
78 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 ...
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33 views

02 Honda Odyssey transmission revs up or doesn't engage at 25 when off gas and up-shifting [duplicate]

my 02 Honda Odyssey transmission revs up or doesn't engage at 25 when off gas and up-shifting. Here is what happens in steps: accelerate to 25 in second gear off gas and upshift to third immediately ...
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1answer
184 views

Vehicle alternator voltage/current output's relation with throttle / engine load

I was diagnosing my alternator to find out if it is working properly. It seems like it is doing its job well. Anyway, interesting thing I found out was that the average voltage output from alternator ...
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Ford fusion throttle body?

I have a manual-transmission 2008 Ford Fusion SE. It's a great car but I have been having some problems with it recently. Firstly, the throttle does not seem to close when I let off the gas pedal. If ...
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1answer
92 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 ...
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2answers
378 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, ...
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2answers
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p0123 - replaced TPS but still dies while driving

My brother has a '96 Plymouth Voyager. He drove it to my place the other day and on his way home it died within a couple of miles. The check engine light was on so I pulled the codes and am getting a ...
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261 views

2 Stroke 70CC Scooter Engine

I own a scooter which I blew the engine in Dec 2016. I since replaced the defective parts in it and it now runs great aside of one thing: Bottom end of the throttle is slugish (I'll elaborate) It ...
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2answers
364 views

Why is the throttle on my motorcycle jumpy?

The bike is a 1991 Honda Nighthawk with just over 180,000 miles on it. It is around 230ccs, and has a carburetor. This is my first bike, so I don't have any idea what is typical behavior for a ...
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1answer
2k views

Engine halts when turning on AC

I have Wagon R (Maruti Suzuki) 2011 model with Petrol and CNG. Whenever I turn on the AC, engine stops. What could be the possible reason for this? This is happening in both cases: Idling as well as ...
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407 views

350z limp mode and low oil

My 350z went into limp mode while I was highway driving, and the check engine light came on. I noticed that the oil was nearly nonexistent, and added oil. The car still wouldn't get out of limp mode. ...
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2answers
272 views

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

I have studied that, RPM is the measure of how fast the Crank Shaft is rotating. Lets consider the following case. You are riding in some speed which shows the engine at 5000 RPM. Now you are ...
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1answer
747 views

Bajaj Pulsar 150 decelarating problems while riding

2011 model which has run to 60000 kms and i use it on daily basis with regular oil change & maintenance etc... Yesterday night i rode the bike close to 20 kms and then came back home , it was ...
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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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120 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. ...
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2answers
880 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'...
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318 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 ...
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2answers
283 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 ...
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1answer
279 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 ...
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1answer
435 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 ...
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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 ...
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2answers
713 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 ...
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1answer
3k 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 ...
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1answer
422 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 ...
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1answer
775 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 ...
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1answer
541 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 ...
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3answers
2k 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. ...
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3answers
323 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 ...
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1answer
186 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 ...
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1answer
2k 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 ...
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2answers
105 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 ...
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1answer
2k views

Driving car with half engaged clutch

Say I am driving my car (Hyundai i10) at 2nd gear. My clutch is engaged. As I increase my throttle position, rpm will increase and so will speed of the car till a point when the speed wont increase ...
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1answer
1k 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 ...
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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 ...
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3answers
847 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 ...
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2answers
3k 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 ...
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1answer
1k 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 ...
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2answers
583 views

Should I give a little throttle after my car starts?

When I start up my 2003 petrol car, as soon as it fires I often give it a dab of the throttle, so the battery recovers. It's fuel injected, no carburetor or anything. I've been told this is pointless....