Q: Rattling noise in neutral. Car won't go over 30mph in 3rd.

asked by on

I have a rattling noise coming from behind my skid plate (I think) while my car is in neutral. The engine starts up, and I can put it in gear. After I start driving, the engine doesn't have much power and once in third gear struggles to get up to 30 mph. What is wrong with my engine?

Hi thanks for the question, man, there is nothing worse than a car that won’t go anywhere when we want or need it to. It sounds like you may be having a problem with your catalyst converter in your exhaust. The rattling you’re describing could be a result of the core inside melting and breaking loose, causing the rattling you’re hearing, and also acting just like a plug in your exhaust pipe, so your engine can’t breath. Enlist the help of a mechanic who has the right test equipment to pinpoint the cause of your problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Rattling noise in neutral. Car won't go over 30mph in 3rd.

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: AC compressor drains the headlights and coolant indicator, check engine light is on

You need to check the engine block grounds on the left and right side of the engine block. Follow the neg. cable down to the engine and make sure it is very tight. Another ground is on the radiator support...

Q: Adding air intake

One of the best brands for performance intakes would be K+N. These intakes, however, make very minimal difference to a four cylinder vehicle. These engines have been designed to produce as much power as possible due to the fact that...

Q: Shakes and idles hard.

Rough operation could be due to a bad tank of gasoline, dirty fuel injectors, incorrect idle speed, exhaust restrictions, vacuum leaks, incorrectly installed or damaged spark plugs, a defective or clogged fuel pump or fuel filter, failing electrical components such...

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...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...