Vacuum Hose Reroute Increased Fuel Economy

[tonystewart]

Good day

I rerouted the vacuum line from the air box to the vacuum switch valve that opens and closes the second intake flap. The new line goes from the vaccum source (air box fitting) directly to seconf intake flap fitting. It nows has vacuum all the time. My last tank say 1.1 mpg improvement. Same drive same weather same everything else.

This was not my idea. See Link

Intake_mod

[jman_va]

The lnk was for a Solara; are you saying you did this with a Sienna?

I am also wondering if there are any ramifications to this? If not, cool stuff.... this day in age we need every MPG out of our vehicles.

[tonystewart]

Yes sir my 2006 Sienna & my 2006 Avalon. Both have shown improvement.

[1up5dn]

Well I just did this mod on my 2004 Sienna and first impression is very positive! It feels like there is less lag down low when first opening the throttle and then it seems like it accelerates a little easier and smoother. I will leave it like that and report back after a month or two and let everyone know if our mileage is affected.

Chris....

[BAD BONEZ BJ]

Will do this to the wife's Sienna this weekend. She needs the MPG.

[1up5dn]

Well, over the long term, I can't say it has really done much for our fuel mileage. The average is the same to slightly better but not enough to crow about. It certainly doesn't bother the motor, so I have no reason to go back (plus it was free).

Chris....