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 ...
Solar Mike's user avatar
  • 34.6k
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 ...
Chenmunka's user avatar
  • 1,432
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 ...
tlhIngan's user avatar
  • 12.2k
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 ...
zipzit's user avatar
  • 6,539
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 ...
SteveRacer's user avatar
  • 12.4k
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 ...
Steve Matthews's 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 ...
sweber's user avatar
  • 7,057
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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
Digital Trauma's 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 ...
dlu's user avatar
  • 14.5k
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 ...
Robert Cline's user avatar
5 votes
Accepted

Loud Knocking/Clicking While Turning Left

Two things come to mind: Before you drive it any further, check the lug nuts all the way around to ensure they are tight. I've seen a lot of vehicles exhibiting what you are talking about have loose ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
tlhIngan's user avatar
  • 12.2k
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,...
Moab's user avatar
  • 7,990
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. ...
JPhi1618's user avatar
  • 13.2k
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 ...
Netduke's user avatar
  • 425
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 ...
Zaid's user avatar
  • 39.1k
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.
rviertel's user avatar
  • 1,169
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 ...
MooseLucifer's user avatar
  • 6,007
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 ...
rpmerf's user avatar
  • 8,403
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 (...
squigbobble's user avatar
3 votes

Difference between revving in park vs. accelerating in drive?

There aren't any additional sensors that are activated or inactivated when you are in Park or Drive. The ECU will manage the engine the best in can at all times based on sensor inputs. Basically, ...
tlhIngan's user avatar
  • 12.2k
3 votes
Accepted

Engine problem while accelerating

This is a well known problem. The clutch is slipping. The plates of the clutch are not gripping together correctly, as you accelerate, the plates move against each other. If left alone, this will ...
Chenmunka's user avatar
  • 1,432
3 votes

My Honda Shine gets auto accelerated?

Assuming what you are saying is that your engine goes to 4,000 RPM as soon as you start the engine, and increases as you ride...This sounds like your throttle is stuck, or is sticking. NOTE: It is ...
CharlieRB's user avatar
  • 9,015
3 votes

What could be causing a grinding noise when car accelerates quickly?

After arriving on the scene, first I established the scope of the problem and areas affected. The noise did not happen if I reved up the engine rpm in park. so we can rule out a valve bearing or ...
0tyranny0poverty's user avatar
3 votes

2007 Dodge Charger acceleration

Sounds like there are definitely issues with the car - the overheating is certainly something you need to get checked out ASAP. It could be a spurious reading from a failing sensor or other electrical ...
motosubatsu's user avatar
3 votes

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

Remove the mass air sensor housing -- usually directly downwind from the air cleaner. Look inside and try to find the tiny insect body or other debris that has lodged itself between the two wires of ...
R Houghton's user avatar
3 votes

Unable to accelerate after jump starting

The failure to accelerate sounds very much to me as though the car has gone into "limp home" mode. This usually happens when the Engine Control Unit (ECU) detects a problem (or thinks it's detected a ...
motosubatsu's user avatar
3 votes

White smoke coming from dash when I accelerate above 60 and steams up the windshield when I accelerate it up to 30 or 35 any advice would help thanks!

Your truck has a leak in the heater core. Engine coolant is circulated through the core to provide heat to the cab. Most vehicle heaters circulate coolant through the heater core even when the heater ...
DavidRecallsMonica's user avatar
2 votes

Optimal acceleration for automatic transmission?

The more throttle you apply the worse your gas mileage is going to be. If you want to absolutely maximize your gas mileage, use the minimum throttle possible. So accelerate only enough to just barely ...
cdunn's user avatar
  • 9,296

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