20 votes

When I step on gas pedal, the engine revs up but there is no acceleration

This sounds like the classic symptoms of a slipping clutch. The solution is to replace it or have it replaced. If it is a DMF (Dual Mass Flywheel - fitted to reduce vibration) type then it is usually ...
user avatar
  • 34.4k
14 votes

Why is my car losing power when accelerating?

This sounds very much as though your clutch is slipping. Essentially, the clutch plates aren't making strong contact and slip against each other under hard acceleration. Under gentle acceleration ...
user avatar
  • 1,423
9 votes
Accepted

Accelerator pedal stuck briefly - how to make sure it doesn't happen again?

There's 3 things you need to look at: the accelerator pedal itself the throttle cable the throttle body If you pop the hood, find your throttle body: it is between the air intake tube and the metal ...
user avatar
  • 12.1k
8 votes
Accepted

Why does the engine have lesser pulling strength when the fuel in the tank is lesser?

It sounds like you have a motorcycle with a carburetor with gravity fed fuel line. (i.e. Without a fuel pump of any sort). In those conditions I can see that there is a higher fuel pressure at the ...
user avatar
  • 6,499
7 votes

Acceleration pickup of a car

How is a 0-100 run done? The fewest number of gears possible will be used, because that's the fastest way to get to a given speed. Engines typically put out their highest power in a certain band of ...
user avatar
  • 13.2k
7 votes

Accelerator pedal stuck briefly - how to make sure it doesn't happen again?

This is a well-worded, interesting, and valuable question. Unfortunately, not among the "gung ho risk taking" mechanics, I would not even guess at an answer without seeing the problem firsthand. So ...
user avatar
  • 12.3k
7 votes

MAZDA 3 2006 (UK) - poor acceleration then takes off at 3250 revs

My gut says it's likely to related to either a dodgy throttle position sensor or a faulty air mass meter. Whilst it is reporting no errors, it's worth doing diagnosis such as resetting the throttle ...
user avatar
6 votes
Accepted

Rough Low Idle and Engine Shakes, Hesitation and Lack of Power

So I finally figured out the problem. First off I had a defective O2 / Lambda sensor, which I replaced. However, this had little or no noticeable effect on the problem. The valve cover gasket was ...
user avatar
6 votes

Accelerator pedal goes to the floor sporadically while driving

From your description, it sounds like there is an issue with the cruise control. If the cruise control "thought" you wanted to accelerate for whatever reason, it would do exactly as you stated and peg ...
user avatar
6 votes
Accepted

Given the following scenario, what type of engine (diesel or petrol) allows for greater acceleration and/or top speed?

Torque doesn't matter. It's power. The difference is that diesel engines have their peak power at lower RPM compared to petrol engines. Same power at lower RPM means more torque. (Think about: The ...
user avatar
  • 7,017
6 votes

What Accelerates a Vehicle With a CVT?

It is not strictly the increase in engine RPM that causes a vehicle to accelerate. Newton's 2nd law of motion states: In an inertial reference frame, the sum of the forces F on an object is equal ...
user avatar
5 votes
Accepted

Does using the entire rev range of a car damage it?

Engines are designed to withstand a certain amount of stress. When you exceed that threshold, longevity will start to deteriorate. I stated something to that effect in this answer. The engine has a ...
user avatar
5 votes
Accepted

Rough idle + slow acceleration + engine dying after spark plug change

Probably not. Engines are pretty tough. But pull a plug before you drive anymore and check for mechanical damage. Pistons hitting plugs would not be good. Also double check your plug wires and make ...
user avatar
  • 14.3k
5 votes

When I step on gas pedal, the engine revs up but there is no acceleration

While I agree it is probably a slipping clutch, before I had the cluth and pressure plate replaced I think you would want to have the clutch pedal cable checked to see if it is mis-adjusted. In some ...
user avatar
4 votes

Scooter: Motor goes off when accelerating

Based on my limited knowledge on scooters courtesy of owning one for about 3 years and assuming your scooter is carb and has similar mechanism (BTW not able to Google your make and model it's rare) ...
user avatar
  • 8,926
4 votes

Is there a car black box to help solve the mystery of Sudden Unintended Acceleration?

Unintended acceleration is a complex problem. It can be caused by hardware failures, software failures, the driver and at times even passengers. Driver panic is a real and common cause, it is ...
user avatar
  • 11.5k
4 votes

Varying acceleration while riding

Since this is a fuel-injected bike, this sounds like an air-fuel mixture problem. Air-fuel mixture problems arise when the mixture is either too lean or too rich. If bad enough, both can result in ...
user avatar
  • 39k
4 votes

Optimal acceleration for automatic transmission?

Each car is a bit different but the highest efficiency for automatic transmission acceleration is usually at the point before the the transmission decides to automatically downshift. The data you ...
user avatar
  • 425
4 votes

Corsa D Stuttering Accelaration with Malfunction Light flashing

A flashing check engine light means you have an active misfire. Driving your car while misfiring for an extended period of time can cause damage to your catalytic converter, so try not do do that. ...
user avatar
  • 13.2k
4 votes

Maintains speed when I let off the gas

My Honda did this, I found it was the floor mat getting jammed against the gas pedal. Other than this it could be: Worn out gas pedal cable, replace it. Extremely dirty throttle body that is sticking,...
user avatar
  • 7,950
4 votes

Rough idle + slow acceleration + engine dying after spark plug change

Don't worry about engine damage. The main difference between these 2 spark plugs is the length, the one you used is shorter. That means 2 things: the spark was not created in the best place, meaning ...
user avatar
  • 12.1k
4 votes

2001 honda civic won't go past 112 mph

The EEC in most cars has a speed limiter function that cuts fuel delivery to the engine past a certain speed.
user avatar
  • 1,169
3 votes

Scooter: Motor goes off when accelerating

What is the most probable cause for this? In the most general terms, the engine isn't running because there is either too much air or too much fuel. Can the cause be that the machine was not in use ...
user avatar
  • 39k
3 votes

While raising the accelerator suddenly my bike's speed goes down

Twisting the throttle opens the butterfly valve in the carburetor which allows it to suck in more air. With the increased air flow, the carb should also suck in more fuel. So, if enough fuel isn't ...
user avatar
  • 13.2k
3 votes
Accepted

While raising the accelerator suddenly my bike's speed goes down

If this is a carburated engine (not fuel injection) then it's likely that one or more of your carburettor jets is blocked or the diaphragm has a hole in it. Find a service manual for this motorcycle (...
user avatar
3 votes

Rough Low Idle and Engine Shakes, Hesitation and Lack of Power

This may well be the smoking gun That "grommet" is actually a fuel injector seal. It is designed to keep air out and prevent fuel from escaping the intake manifold. If it is compromised then fuel ...
user avatar
  • 39k
3 votes
Accepted

Can trouble codes P2138 & P2279 be related for a 2005 Honda Pilot?

Can trouble codes P2138 & P2279 be related for a 2005 Honda Pilot? Yes, it would seem so. After replacing the Pedal Position Sensor both codes went away and have not come back. I ended up ...
user avatar
  • 51
3 votes

Opel Corsa D engine issue?

My first thought, having owned 3 Opels/Vauxhalls (including two Corsas), is the coil pack. When it starts to die, you get the symptoms you are describing. Your #2 cylinder's spark plug isn't firing ...
user avatar
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 ...
user avatar
  • 8,413
3 votes

Warm fuel injected engine stutters when accelerating

I encountered a similar problem with my Honda D15 engine. The car would start fine when it was cold, but have trouble starting warm, stumble under acceleration and sputter/die at idle. I had also ...
user avatar
  • 6,017

Only top scored, non community-wiki answers of a minimum length are eligible