Skip the auto shop - Our mechanics make house calls

Q: Loss torque on accelration

asked by on

Car was put on high load entering highway and experienced a grinding rattling doing for a few minutes and went back to normal. Check engine light flickered and code for #6 cylinder came up. Spark plugs did need replacing and improved performance but car has lost significant torque and revs high to meet higher speeds also has small metallic sound on hard acceleration.

My car has 123 miles.
My car has an automatic transmission.

It sounds like you are experiencing a lean condition and engine pinging. The most common fault I have seen for this is when the mass air sensor causes the engine to go too lean. When you look at the scanner readings with the key in the engine off position, the mass air sensor should indicate the correct altitude you are at. I have seen them read above 10000 feet when I was at less than 100 ft in one scenario. If you see this problem it may not set a code since the mass air sensor is still within specified range for the sensor but out of range for the actual altitude. Replace the sensor if it is proven to be out of range. You can try to clean the sensor but I have not seen it fix this type of issue. It is normally necessary to just replace it.

If you decide that you need some assistance with these checks, consider contacting a certified mechanic who can diagnose your loss of power symptoms firsthand. The issue can then be addressed once the problem has been pinpointed.

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

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: Difficulty accelerating

Hello. It sounds like your clutch is worn out and going bad. The clutch is what allows your transmission to shift into gear and it also allows the transmission to provide power to the wheels while driving. A lot of...

Q: Car jerks during quick acceleration

You may have a misfire in the engine or low fuel pressure from a bad pump, clogged filter, or both. I recommend having a mechanic test the fuel pressure and volume to see if the fuel pump is meeting specifications....

Q: Codes P0121, P0221, P2101, P2104, P2110, P2111

Here are the codes, what they mean and the potential causes below each of them. Note that some of them may be related and can cause additional codes to be triggered that may be fixed when one of it's related...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...