Skip the auto shop - Our mechanics make house calls

Q: On interstate, after 15-20 seconds car loses acceleration

asked by on

I had been driving at highway speeds for around 15-20 minutes when, (within 5 seconds) the yellow engine overheating warning light came on and then immediately turned to red. All acceleration power was lost and my car’s speed started dropping slowly. I tried the accelerator but it would not respond. With no acceleration, I had to cross three traffic lanes which almost caused several accidents. My car rolled to a stop on the highway. I turned the car off and waited for several minutes; then everything seemed fine. However, this same thing has now happened multiple times. Each time it has happened, I had been driving on the highway for 15-20 minutes. What is causing this and what should I do to fix it?

A: Hello. Thanks for writing in about your 200...

Hello. Thanks for writing in about your 2007 BMW 335xi. It sounds like the thermostat may be sticking. The thermostat needs to be checked and the cooling system needs to be checked to make sure that the coolant is flowing properly. If there are no leaks, then I would replace the thermostat first and do a block test to make sure that there is not damage to the engine. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the acceleration issue and let you know what needs to be done.

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: Car won't start, possibly due to electronic steering wheel lock

Hello. I usually start by having the battery load tested. Though the battery may seem fine, it may be failing internally. If the battery is fine, then the alternator will need to be checked. I am suspecting that the battery...

Q: Car is not accelerating

This is a common problem for your vehicle. Commonly the catalytic converters in your vehicle will clog up or melt and when that happens the exhaust backs up into the engine and causes you to not be able to accelerate....

Q: Engine keeps misfiring on humid days

The humidity in the air will also affect the air pressure around your vehicle. When air pressure is affected, engine vacuum is also affected. The engine's positive crankcase ventilation system relies on engine vacuum to function properly. If the engine...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.