2005 Toyota Sienna driving like I'm pulling a small trailer
10

Asked by pavlograd Sep 09, 2015 at 12:19 AM about the 2005 Toyota Sienna LE

Question type: Maintenance & Repair

My 2005 Toyota Sienna has 148K miles on it and I've owned since new.  Van is well maintained, and many things have been serviced.  Also have installed new mass air flow sensor recently.  Problem:  Van's mileage is down on highway from about 26-27 when newer to now 21-22 on highway.  Best way to describe it is that it drives like I am pulling a 500-700 pound trailer.  The least bit of grade and it downshifts from OD to 4th gear (about about 70mph).  If on a nice Kentucky hill, it will even have to downshift to 3rd gear (and jump to 4K rpm) in order to maintain  cruise control speed.  Yes, all this is while on cruise control, but problem is still there with cruise off and me trying to hold constant speed with throttle.  Basically, it is constantly shifting back and forth between 4th and OD unless the road is almost perfectly flat.  It DID NOT used to do this and when newer it could actually accelerate in OD gear (5th).  Any suggestions?

1 Answer
10

pavlograd answered 8 years ago

I have run about 3 cans of Sea Foam and about 6 tanks with Marvel Mystery Oil thru to clean injectors. Last time my mechanic checked, there were no 'problem' codes being thrown. Did he maybe not look deep enough? Have not checked fuel pressure and flow. Have only changed tranny fluid once at about 80K miles. Fluid still now looks healthy.

Mark helpful

Your Answer:

Related Questions

  • 2005 Toyota Sienna driving like I'm pulling a small trailer 1 Answer

    My 2005 Toyota Sienna has 148K miles on it and I've owned since new. Van is well maintained, and many things have been serviced. Also have installed new mass air flow sensor recently. Problem: Van...

    2005 Toyota Sienna LE

    -

    Maintenance & Repair

  • 2005 Toyota Sienna XLE Limited 2 Answers

    Need help! My 2005 Toyota Sienna XLE Limited overheats while idling in heavy traffic. a/c starts blowing warm and recirculating button gets stuck till I start driving and a/c goes back to normal. ...

    2005 Toyota Sienna XLE Limited

    -

    Maintenance & Repair

  • 2005 Sienna Toyota - AC Blower 1 Answer

    My front AC blower is shot. The rear AC blower still works. Is it possible to remove the rear blower and use it as the front blower? I use the van as a cargo van, so I really don't need the rear bl...

    2005 Toyota Sienna

    -

    Maintenance & Repair

  • Why does my 2005 toyota sienna smell like gas fumes are coming in when heat is turned on and im at a stop or idle? 5 Answers

    My 2005 toyota sienna seems to have a gas smell at idle or when stopped. Also when im in park and car is running and hest is coming out my vents. Dont see no leaks and im not losing gas any wheres...

    2005 Toyota Sienna XLE Limited

    -

    Maintenance & Repair

  • 2005 Sienna only blows heat while driving, not idling - what's wrong? 3 Answers

    2005 Sienna only blows heat while driving, not idling - what's wrong? Blower always works, but it's only warm when driving.

    2004 Toyota Sienna 4 Dr CE Passenger Van

    -

    Maintenance & Repair

Own this car?

Share your experience with others.

2005 Toyota Sienna

Write a car review

Review another car

Shortcuts

Search Toyota Sienna Questions

CarGurus Experts

  • #1
    TLX_4765
    Reputation
    2,050
  • #2
    Mik00000
    Reputation
    1,910
  • #3
    dandyoun
    Reputation
    1,710
View All

Know more, shop wisely

Search

Related Models For Sale

Used Honda Odyssey
722 Great Deals out of 17,561 listings starting at $675
Used Toyota Highlander
1,339 Great Deals out of 18,494 listings starting at $500
Used Chrysler Pacifica
576 Great Deals out of 14,235 listings starting at $1,528
Used Honda Pilot
951 Great Deals out of 29,227 listings starting at $711
Used Toyota Sequoia
136 Great Deals out of 3,637 listings starting at $1,100
Used Toyota Highlander Hybrid
149 Great Deals out of 2,428 listings starting at $3,250
Used Toyota RAV4
1,946 Great Deals out of 28,631 listings starting at $1,500
Used Toyota Camry
1,972 Great Deals out of 34,551 listings starting at $500
Used Toyota 4Runner
1,147 Great Deals out of 18,239 listings starting at $1,550
Used Dodge Grand Caravan
323 Great Deals out of 5,509 listings starting at $800
Used Toyota Tacoma
1,917 Great Deals out of 32,451 listings starting at $2,990
Used Toyota Tundra
1,066 Great Deals out of 32,671 listings starting at $3,000
Used Toyota Corolla
1,504 Great Deals out of 23,712 listings starting at $1,150
Used Chevrolet Suburban
620 Great Deals out of 12,931 listings starting at $975

Used Cars for Sale

2024 Toyota Sienna For Sale
1,819 listings starting at $37,685
2023 Toyota Sienna For Sale
48 Great Deals out of 832 listings starting at $31,800
2022 Toyota Sienna For Sale
52 Great Deals out of 519 listings starting at $28,000
2021 Toyota Sienna For Sale
42 Great Deals out of 766 listings starting at $24,795
2020 Toyota Sienna For Sale
35 Great Deals out of 466 listings starting at $11,984

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.