Skip the auto shop - Our mechanics make house calls

Q: Acceleration problems

asked by on

I've been having trouble with my Commodore lately. The car starts fine however when I touch foot on the accelrator just in park, the whole car shakes and shudders followed by a only explained as a slight rattling noise. The car will then cut out completely. I've had the RAA look at it and be pretty stumped. Got a lube mobile mechanic to have a look and he tested spark plugs leads etc. all tested ok, for him to then tell me that it's the fuel pump, however the same problem occurs on gas? Could that still be the problem? Any advice?

A: Hello. Most of the time this occurs from a ...

Hello. Most of the time this occurs from a failing throttle body. What I would be concerned with first is the noise. If it has a failing timing chain then this can occur, but that noise will also happen if the engine is stalling. If there is no engine noise prior to trying to accelerate then I would suspect a failing throttle body. Prior to changing this I would scan the computer for codes and also check the sensor inputs to see if any of them are not reading correctly. By doing this the issue should be able to be found.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine light blinking and the oil light come on. Accelerates slow but when you get to about 30 mph it smooth out. Then when you slow down it start shake.

For the cylinder that has excessive oil in it, the oil is either coming in for the piston rings being worn or the valve guide is leaking on the intake valve causing the engine to consume the oil. If the...

Q: Sequaling noise on light acceleration when the engine is warm

You should have the serpentine belt and belt tensioner checked and replaced as a set if it is the cause of the squeal. This is the most common cause of squealing. If you would like, a certified technician from YourMechanic...

Q: Car not accelerating when first started

Hi there. When you let your car sit for a long period of time the gasoline tends to lose its combustibility. Along with sediment settling in your tank this will cause your vehicle to not perform properly. Also a malfunction...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...