Skip the auto shop - Our mechanics make house calls

Q: Opinion on cylinder deactivation

asked by on

What's your opinion on cylinder deactivation?

A: Cylinder deactivation on those cars, let’s ...

Cylinder deactivation on those cars, let’s say a V8 engine, sometimes runs on 4 cylinders and sometimes runs on 6 or 8. It determines this through computer activation.

The old systems are absolute garbage. GM had one on Cadillac, and it was a piece of garbage. It fell apart and they run like junk. The new ones are completely different designs. They are all computer controlled and some of them work quite well so you get maximum power with the maximum gas mileage when you are just touring around at a steady speed.

But, they are very complex systems and when they break they cost a small fortune to fix. My advice is, if you want a good gas mileage, get a 4-cylinder car or a diesel. If you want power, get a V8 or the turbo charged car. But, don’t think you are going to get a giant past V8 that’s going to get a really good gas mileage with those type of systems. Because, I guarantee it, they’ll all end up having problems, breaking down when they are older. They are so complicated.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Loud chirping from valvetrain

Hello, thank you for writing in. There are several causes for low compression. It was a great idea to test all cylinders. With only having low compression in one cylinder, the issue is likely an exhaust valve. The vehicle should...

Q: f250 5.4 v8 automatic 4x4. It spit a spark plug in a cylinder and still runs just misses. Shop is asking 4500. What damage can it cause and how much to fix it?

If the spark plug is spitting out, then the threads in the cylinder head or on the spark plug have been stripped out. Check the spark plug if you still have it and see if its stripped. If the plug...

Q: Brake fluid leak

Are you sure it is brake fluid? It sounds like you are describing the differential housing cover. If the housing cover is leaking, you need to replace the differential cover gasket. Refer to a factory service manual for fluid specifications...

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...
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...
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.