Ok smart car guys.

[desertrat]

Test of knowledge. I just found out my truck senses when to go from V8 to V4. I'm guessing it turns off spark and injectors. How to the O2 sensors know that all this fresh air suddenly in the mix is OK? Or do they even care?

 

[withrespect]

Test of knowledge. I just found out my truck senses when to go from V8 to V4. I'm guessing it turns off spark and injectors. How to the O2 sensors know that all this fresh air suddenly in the mix is OK? Or do they even care?

Oil Change.

 

[RoseRed]

Oil Change.

Universal joint.

 

[desertrat]

Universal joint.

Did you know universal joints really aren't?

 

[RoseRed]

Did you know universal joints really aren't?

I do now.

 

[withrespect]

Did you know universal joints really aren't?

Probably a fan belt. or a bad spark plug. Better get the oil changed just to be safe.

 

[RoseRed]

Probably a fan belt. or a bad spark plug. Better get the oil changed just to be safe.

Transmission flush.

 

[desertrat]

Probably a fan belt. or a bad spark plug. Better get the oil changed just to be safe.

Hmm, my fan does make a lot of noise.

 

[kwillia]

One of my friends has a smart car.... but he totaled it... Hit a deer tick...

 

[RoseRed]

One of my friends has a smart car.... but he totaled it... Hit a deer tick...

 

[withrespect]

One of my friends has a smart car.... but he totaled it... Hit a deer tick...

 

[aps45819]

Test of knowledge. I just found out my truck senses when to go from V8 to V4. I'm guessing it turns off spark and injectors. How to the O2 sensors know that all this fresh air suddenly in the mix is OK? Or do they even care?

what fresh air?

 

[desertrat]

One of my friends has a smart car.... but he totaled it... Hit a deer tick...

what fresh air?

I am assuming the valves continue to open and shut, thus pumping just air through.

 

[aps45819]

I am assuming the valves continue to open and shut, thus pumping just air through.

If everything continues to operate except the spark and injectors wouldn't all the mechanicals drag and drop your mileage?

 

[desertrat]

If everything continues to operate except the spark and injectors wouldn't all the mechanicals drag and drop your mileage?

Guess not. What are they going to do? Disconnect from the crank? When this happens I am usually coasting. Instant message says 99mpg. I love to see that. It also helps me think a lot about accelerating, which I do, but more so now.

 

[Graymatter]

Check your motional transducer.

 

[glhs837]

The O2 sensor acceptable values are adjusted when you go to 4 cylinder mode. As for what happens, here's the Chrysler version, good animation


HEMI 5.7L DODGE RAM MDS - YouTube

GMs system

2014 Corvette C7 LT1 Engine Active Fuel Management Animation - YouTube

 

[desertrat]

The O2 sensor acceptable values are adjusted when you go to 4 cylinder mode. As for what happens, here's the Chrysler version, good animation


HEMI 5.7L DODGE RAM MDS - YouTube

GMs system

2014 Corvette C7 LT1 Engine Active Fuel Management Animation - YouTube

They stop the valves? Dang. At least on the Chevy. Seems like it would be better to keep them going. Then again. I'm sure I have no clue.

 

[glhs837]

They stop the valves? Dang. At least on the Chevy. Seems like it would be better to keep them going. Then again. I'm sure I have no clue.

Says here that keeping the burnt charge from the last ignition cycle acts as an "airspring", you lose power to compress, but since it pushes right back, no significant loss in power.

Variable displacement - Wikipedia, the free encyclopedia

 

[desertrat]

Says here that keeping the burnt charge from the last ignition cycle acts as an "airspring", you lose power to compress, but since it pushes right back, no significant loss in power.

Variable displacement - Wikipedia, the free encyclopedia

But still a bit on the crank and pin. Be cool if it would alternate which 4 cylinders it chose. Less wear all around.