Skip the auto shop - Our mechanics make house calls

Q: Lack of acceleration lumpy idle doesn't pull away well.

asked by on

I have recently had some work done on the car at audi where they found oil in the header tank and carbon in the egr valve which they replaced. Since I had it back the idle has become very lumpy and can be worse when the temperature outside is hot. The acceleration is lacking when it comes to motorway speeds and pulling away is sometimes not the best. Also when starting the engine it can have a bit of a judder. Audi took it for a test drive and said that my clutch and flywheel were near to the end cos of it slipping. I then took it to another garage and they said that the clutch is fine about half worn. He mentioned that it may be injector problems. So am wondering what you think and how do I go about diagnosing the fault without spending lots of money. Don't have the engine management light on so a little confused. All I know it's not that nice to drive at the moment. I have a 2 tdi.not the v6.

My car has 107000 miles.
My car has a manual transmission.

A: Hi there. This can be an injector issue, bu...

Hi there. This can be an injector issue, but from my experience it sounds more like a failing catalytic converter. After the type of service you had it is common for the catalytic converter to fail and cause this so I would start by checking that first. If it is fine, then I check the injector flow rates and the fuel pressure. The air flow meter is also a common failure that causes this so that needs to be checked also. If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair the poor acceleration.

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・Save up to 30%

Get a quote

What others are asking

Q: Coolant leak despite water pump replacement

It sounds like you have already pinpointed the leak. I suggest having your radiator hose replaced as soon as possible since coolant loss can lead to engine overheating and extensive damage. A technician from your YourMechanic can easily do this...

Q: Car making weird noise after accident

Hello. There are a number of things that can be making noise, but without having a description of the noise and when it occurs it is hard to say what it may be. If the noise occurs only when the...

Q: Car won't start

Try to move the steering wheel back and forth while turning the key. You may have bound up the steering lock when the vehicle was parked. If the key turns okay now, then the vehicle should start. If the steering...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...