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Post Info TOPIC: Help with the 5.3 Vortec Flexfuel
455gto


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Help with the 5.3 Vortec Flexfuel
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My engine switches from 8 cylinders to 4, but at idle goes back to 8 cyl confuseconfuseconfuse
Wouldn't it stay at 4 cyl at idle?  Anybody have knowledge of this engine.

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67SD396


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Not sure but I don't think there is enough momentum in the engine to stay running on 4 cyl at idle. My 6L G8 has the DOD (displacement on demand) option and I don't care for it except that when I shut it off, I lose about 3mpg. It sounds like crap when it runs on 4 or 6 and I can really feel the shake of the engine in my arse! But how can I complain, it is faster than my 67SD396 and it gets an honest 28mpg driving 120km/h.

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Taylor55


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No it will not stay on 4 cylinders at idle, it has to run on eight to idle smooth. These 5.3 on designed to run on 4 cylinders after reaching a certain speed and the torque load is over.

Al

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427carl


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Taylor55 wrote:

No it will not stay on 4 cylinders at idle, it has to run on eight to idle smooth. These 5.3 on designed to run on 4 cylinders after reaching a certain speed and the torque load is over.

Al


Al;  you are correct!    I have a 5.3 07 Sub  and you only see it on 4 at speed..

   It NEVER causes me to "know" when it is in 4 or 8 except by the dash readout ...

   We love it  nod.gif

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455gto


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Thanks for the info.
Damm readout is changing my driving habits. It's like a car wreck.....when I put my foot into it it goes from 7 L- 100kms to 48 L- 100kms ouch

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dualquadpete


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455gto wrote:

Thanks for the info.
Damm readout is changing my driving habits. It's like a car wreck.....when I put my foot into it it goes from 7 L- 100kms to 48 L- 100kms ouch


OK whats that in REAL milage, that doesn't mean "squat" to some of us "older" guys that were brought up in the good old IMPERIAL system????? 

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455gto


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dualquadpete wrote:

455gto wrote:

Thanks for the info.
Damm readout is changing my driving habits. It's like a car wreck.....when I put my foot into it it goes from 7 L- 100kms to 48 L- 100kms ouch


OK whats that in REAL milage, that doesn't mean "squat" to some of us "older" guys that were brought up in the good old IMPERIAL system????? 
That means it takes about 1 3/4 gallons to go over 60 miles. With my foot in it 12 gallons to do the same distance.

 



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dualquadpete


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so the 1st. equation is close to 28 to 30 MPG & the 2nd. is around 5MPG Yeah, OUCH keep your foot out of it. 64 cat. with dual quads does better than that with my foot in the radiator, & will get 18 MPH on the hi/way & I'll bet it sounds better with the 389 at full song & both carter's wide open!!! I can't figure out this "ethenol" garbage, they add it to our gas, we get less milage with it & they charge you more for it!!! That just doesn't "compute" with my brain

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