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 9 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

Shortcuts

Search Toyota Sienna Questions

CarGurus Experts

  • #1
    TLX_4765
    Reputation
    2,050
  • #2
    Mik00000
    Reputation
    1,920
  • #3
    dandyoun
    Reputation
    1,710
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Honda Odyssey
27 Great Deals out of 916 listings starting at $4,995
Used Toyota Highlander
25 Great Deals out of 712 listings starting at $6,495
Used Toyota Sequoia
4 Great Deals out of 72 listings starting at $16,489
Used Chrysler Pacifica
47 Great Deals out of 1,157 listings starting at $13,999
Used Honda Pilot
48 Great Deals out of 1,197 listings starting at $4,495
Used Toyota RAV4
79 Great Deals out of 2,040 listings starting at $3,499
Used Toyota Highlander Hybrid
17 Great Deals out of 246 listings starting at $11,550
Used Toyota Camry
49 Great Deals out of 952 listings starting at $2,212
Used Dodge Grand Caravan
123 Great Deals out of 1,887 listings starting at $612
Used Toyota 4Runner
14 Great Deals out of 328 listings starting at $9,900
Used Toyota Tundra
50 Great Deals out of 1,126 listings starting at $5,999
Used Chevrolet Suburban
4 Great Deals out of 406 listings starting at $12,000
Used Toyota Tacoma
55 Great Deals out of 1,032 listings starting at $8,708
Used Chevrolet Tahoe
19 Great Deals out of 716 listings starting at $5,995

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.