Q: At highway speeds, car loses power

asked by on

At highway speeds, my car experiences loss of power. This problem is intermittent and it has been serviced “five” times; however, the problem continues. The engine is making a ticking sound and there is a power drop of about 35 mph. The dealership replaced the fuel filter, fuel gauge, O2 sensor, and the fuel pump. This most recent service trip, the dealer insisted that the problem is a clogged catalytic converter. Losing power on the interstate, or anywhere, is very serious and dangerous. Plus, continually being told by a dealer five times that the problem has been fixed, when it isn’t, is very frustrating. What is your diagnosis and solution?

I would check the fuel pressure (for being low) before doing anything else. If it is, check the fuel pressure regulator. (A clogged catalytic convertor would be a constant problem, not intermittent as you describe.) A professional mechanic, like one from YourMechanic, can help diagnose and repair the loss of power 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
  1. Home
  2. Questions
  3. At highway speeds, car loses power

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: Why does my 2008 Toyota Tundra make a loud metal rattling noise whens started

Hi there. This noise can be caused by a few things. Most of the time it is caused by a loose heat shield on the exhaust. When this occurs you will hear the noise as the shield rattles and some...

Q: Car only drives forward in reverse

Hi. Since the reverse lights turn on when you shift into gear, that is a clear indication that the mechanical portion of the shift linkage is working. I believe the shift solenoid inside the transmission might be stuck open or...

Q: 1998 Dodge Dakota Keeps stalling and backfires sometimes

Hi there. You may have a bad or contaminated mass air sensor or a leak in the air tube between the mass air sensor and the throttle body. Have the computer tested for codes and check mass air sensor readings...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...