Q: Loss torque on accelration

asked by on July 02, 2016

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?
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

My car is still acting up and the speedometer and odometer is not working.

Hi there. First remove the battery cables both positive and ground. Go in the cab and operate everything, even though there is no power. After 12 minutes put the battery cables back on. This will drain all power to the...

What would cause a loud noise from the rear of my 2004 Ford Focus

Hello. The noise sounds like a brake problem. You will get the higher pitched noise from the brake pad sensor hitting and the deeper noise would occur if one of the brake pads are metal to metal. It can also...

Car overheating during idling or stop and go traffic

Hello. If the engine will stay cool with the AC on or when the vehicle is moving then there is a cooling fan circuit issue. The computer may not be turning on the fan when the engine is getting hot....

Related articles

The Best Used Cars to Buy for Families
If If it’s time for you to search for the top used cars specifically for families, check out the list we’ve put together of the top five. The list of must-haves Typical items that families are looking for in their...
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
2012 Hyundai Elantra vs. 2012 Ford Focus: Which One Should I Buy?
The Hyundai Elantra and the Ford Focus are both offerings in the inexpensive compact sedan category, and both represent some of the best offerings in that class. Compact cars are slightly larger than a subcompact, but smaller than a mid-size;...