Q: Knocking, sputtering, and jerking, feels like its losing power.

asked by on May 24, 2017

Car is knocking. Steady at idle, louder and faster when accelerating or decelerating. Also jerking, sputtering, and shaking. Feels like it's losing power and can't accelerate past 30-35mph without it doing that either. Was told that the knocking could be an engine lifter or piston but the jerking and all that is new?

My car has 166000 miles.
My car has an automatic transmission.

Hi there. Typically these symptoms are not associated with the same exact mechanical fault. Like you said, engine knocking is sometimes caused by lifters or engine misfiring, but the engine jerking and inconsistent acceleration could be something completely different. It’s possible that you have a vacuum leak, worn engine mounts or mass air flow sensor / other fuel system components that are dirty or damaged. It’s better to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can isolate the issues and determine what repairs will resolve these issues.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

it over heat and now wont start and the engine oil looks like milkshake

Milky or milkshake-looking engine oil indicates the engine oil and engine coolant have mixed together. This can happen after a severe overheating of the engine. This mixing can happen from either the head gasket cracking, or the cylinder head itself...

2001 Chevy s-10 truck that won't start. Lights come on but when I turn the ignition there is no noise ( grinding, clicking )

Hello, thank you for writing in. The vehicle depends on two main components for starting. Considering the starter motor is not functioning at all, you either do not have power going to it, or the motor has failed and is...

Smoke is coming out of dipstick and where you put the oil in also the oil keep burning up in about four days and its starting to s

Hello. This suggests you have a couple of different problems that may be indirectly related. Smoke coming out of the dipstick to a certain degree is OK, however if this is excessive, this is not good and should be looked...

Related articles

Essential Things to Know About the 2017 Chevrolet Bolt Electric Car
The 2017 Chevrolet Bolt is the first all-electric car under $50k. The Chevy Bolt has a higher EPA rating than Tesla and gets 238 miles per charge.
A Buyer’s Guide to the 2012 Chevrolet Silverado Hybrid
If If you’re looking for a half-ton pickup truck that also gets great gas mileage, look no further than the 2012 Chevrolet Silverado Hybrid. While it has the towing and carrying capacity you’d look for in any regular truck, it...
2012 Chevrolet Traverse vs. 2012 Toyota Highlander: Which One Should I Buy?
Large SUVs are a huge and broad market, with a range of different offerings from economy to luxurious. The majority of the SUVs and crossover SUVs offer decent gas mileage, plenty of room for friends and family to ride along...