#31 I saw a video where a guy bought a Chevy / GM pickup truck and found out the engine switches from 8cyl to 4cyl and not enough oil gets to the pistons and lifters and camshaft and the engine needs major fixing or a replacement around 40,000 miles. The next year model did a random shutdown of 4 cyls as the problem mentioned before would not happen for a while longer as not enough oil did not get to the engine parts. Chevy says 30% less fuel consumption.
It is called AFM - Active Fuel Management
There are 3rd party software that he said he bought to block the engine cyl shutoff. He said you should not have to do this and most would not know to do this. There is a class action lawsuit over this.
Why was this engine designed this way? Because of EPA regulations and all to save 1 to 2mpg...!!
Gov’t destroy’s the engine for that!
Many links to look over.
Google: AFM - Active Fuel Management causing problems
—”It is called AFM - Active Fuel Management”
An AFM tale of woe, from early AFM use.
A guy I worked with, was a Caddy man, and every other year a new one...
And then he bought a Caddy 8-6-4, he loved it, for a year or so and planned to keep this one longer! The best car he ever owned...
Then one day he did not come in to work and did not call; this never happened before.
His beloved 8-6-4 died coming into work, this was before cellphones. It took hours to get a hook.
On the way home in the dealer loaner he spotted an Audi dealer and selected a new Audi.
An interesting side note, he had a service that would come to the car for routine maintenance/ trailer for technical work.
He claimed this cost less than the dealer and less hassle.
When the 60 Minutes BS Audi story came out, he scooped up one for his wife and one for his daughter on the cheap.
“and not enough oil gets to the pistons and lifters and camshaft”
Given that oil flow was not altered, please explain.
“The next year model did a random shutdown of 4 cyls “
The next year they replaced the engine with a different model. Existing owners deactivated the system.
I got to your post via another citing the 1981 V8-6-4 so that is the reference to my posts.
In 2004 Gen 2 was introduced on several models that used oil pressure for valve modulation.
I don’t see any references to reliability problems although they did move to a “Dynamic” system a few years later.