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Toyota Sienna Engine Problems

I have a 2004 XLE with approx 40,000 miles and I have a very persistent spark knock that is anoying. Does anyone know how to remedy this? I f I remember you used to be able to retard the timing just a touch and eliminate this one some vehicles. Would this work on this one and if so how can I go about doing it?

I have also noticed that these vans eat tires. I'm on my second set and they are already wearing unevenly (after alignment) and making the dreaded wop wop wop noise ( yes I rotate them and keep them inflated firmly).

Thanks for your help.
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Comments

  • I have an '04 with similar mileage, but have not experienced your problems - not with knocking and not with tires. We are on our 2nd set.

    In a way, I can understand if these vehicles go through tires quicker than other vehicles b/c of friction. Just like sportscar tires wear out more quickly b/c they are made to grip the road and, thus, increase friction, the weight of the minivans should give more friction to the tires than other vehicles.

    Good luck with your issues.
  • tanzatanza Posts: 1
    My 2000 Sienna XLE has 84K miles on the odometer. I took it in for the "big" service. Now it has harsh engine vibration at idle while the car is in gear (i.e. stopped in traffic). The engine is also noticeably louder when it shifts into OD at freeway speeds (55-65 MPH). Finally, the gas mileage has dropped about 2 mpg. My dealer can't seem to figure out what the problem is. They changed two engine mounts which isolates the vibation somewhat but there is still engine vibration.

    Has anyone experienced this problem? Can someone offer some advice? I like my Sienna but the vibration is starting to get on my nerves.
  • caravan2caravan2 Posts: 198
    I was driving someone else's 2006 LE with 25K miles on it. When I start it, the sound comes like slippage of serpentine belt. Then it goes away. Is this normal?

    Second, Service RQD was on constantly. He said, it has to be reset everytime after oil change is due. Is this normal also.
  • There is a TSB on the nocking I took mines to the dealer
    and got fix at no charge.
  • I had recently had a check engine light diagnosed as a faulty ECM. This module is very expensive ($1700)and I was looking for a replacement.

    Any ideas here?

    What impact is there for not replacing this module as the car is running okay?
  • nhzeronhzero Posts: 1
    Every time I get into my Sienna to go somewhere, after a few seconds it will make a weird noise that I can feel through the pedal for about two seconds. It seems to be speed triggered, not time triggered, and it takes a little while, it's not immediate. It also doesn't seem to be related to whether I back out or pull forward, or have anything to do with whether I use the brakes or not.

    It reminds me of those old toy cars that had a little plastic strip that touched the gear to make a noise. After it does the noise (EVERY time I go somewhere), it won't do it again until I turn the car off and go somewhere else. I haven't tried putting it back in park after it does the noise to see if it does it again, but I am completely confused as to what it could be. Any ideas? I am hoping it's not something expensive in the transmission.
  • mnrep2mnrep2 Posts: 200
    This sounds like, your ABS braking system "Self Test". Most cars exhibit this behavior today. Some more loudly than others. Don't worry, no problems ;)
  • jaccord,
    Do you know the TSB number so I can refer to it? Also how long did the repair take and did it work?
    Thanks
  • Anti-Lock Brakes it is! It is really noticeable in the Sienna. My last vehicle, a 2005 Tacoma was the first vehicle I had with anti-lock. It made a whoosh or shwoosh sound when first started up and you took off in the driveway. About 5-8 seconds after you started moving. Does it in reverse, too.
    We had snow a while back and I had some kids in the car who asked me to go sideways on the ice. You should have heard the anti-lock brakes then. Sounded like a little motor running when the tires slid when I applied the brakes.
  • Hi here is The tsb Im not sure how long it took I drop it in the morning and then pick it up at night.
    Engine "Pinging" or "Knock Noise"
    TSB EG055-06 September 6, 2006.
  • ejk3ejk3 Posts: 1
    I have 2001 Sienna of which mileage is 78K now.
    I took it to local auto shop to get maintenance 3 days ago.
    At that time, mechanic said my car's oil level was too low
    even though I changed it just a few months ago.
    The next day, he called me and said that one piston was broken and unless I change engine, my car will die on the road. And he said he had seen lots of similar problems in other Siennas and Avalons.
    I picked up my car today and they charged 1600 dollars.
    Can this case be covered with oil gel settlement?
    And I'm not keeping any oil change receipts. Can I get reimburse for this? :cry:
  • mlowmlow Posts: 1
    My 2004 Toyota Sienna has developed a noise when started, especially when cold. It is quite a loud noise, similar to valves clacking, but it goes away and we don't hear it once the engine is warm. the dealer does not seem to think this is a problem but it did not make this noise when we bought it over even a few weeks ago? I don't like it - anyone else have a similar issue now or in the past?
  • avital123avital123 Posts: 2
    I had a very similar problem witha 98 Nissan Quest Minivan. It had a loud clank noise as it the valves were clacking. When I first took it to the mechanic, they replaced the exhaust manifold seal. Noise went away but came back a week later. I took it again and it turned out that the exhaust manifold assembled to the engine block had warped. Some of the bolts holding the manifold to the engine had broken off as well. As the engine heated up (around 3 - 5 minutes) the warpage would straighten up and the noise would go away. I replaced both front and rear exhaust manifolds and the vehicle is working very well.
  • avital123avital123 Posts: 2
    I have a 1998 Nissan Quest Minivan. A year and a half ago after travelling 70 miles at 65 mph using the cruise control, the transmission shifted down to 3rd gear for a few seconds then shifted back to overdrive. As I kept driving, it did it more often. I returned the 70 miles and had to really slow down as the transmission shifted even as down as 2nd gear. The mechanic could not detect any issues using the computer. I used it 18 months in the city without any problems at all. This weekend I travelled and again after 70 miles, it started shifting down from overdrive to 3rd gear. On my way back, I was travelling against the wind and had absolutely no problems. It appears as if it was heating up but the wind was cooling down. I have been driving it around in the city and again, absolutely no problemas. Has anyone experienced the same issue? Should I add a transmission radiator or should I give up and replace the transmission?
  • fulcrum81fulcrum81 Posts: 9
    I was testing drive a sienna xle. It's very quiet on local road. But when I tried to accelerate, the engine sounds very noisy, not as rhythmic as odyssey's engine. Anyone noticed this?

    Also, on the highway, the sienna seems as noisy/quiet as odyssey...
  • ateixeiraateixeira Posts: 72,587
    I think at cruise it's quieter.

    The 3.5l is louder than the old 3.3l because it uses a timing chain, but then again so does Honda. Plus, that means less maintenance down the road.

    Also, for the 3.5l, normally only one opening in the intake is used. At more than half throttle, or over a certain rpm, the 2nd intake path is opened for more power, and yes it makes more noise while that path is opened.

    Toyota added more insulation for 2007 to compensate for the extra noise, but at full throttle the engine asserts itself nicely.
  • nilionnilion Posts: 2
    I RENTED A 2007 TOYOTA SIENNA XLE VAN AND DROVE THROUGH A MOUNTAINOUS AREA. I NOTICED A HUMMING VIBRATION BEGINNING AT 2200 RPM, AND THE VIBRATION INCREASED IN BOTH SOUND AND VIBRATION, AND THEN PEAKED AT ABOUT 2500 RPM - THEN STOPPED WHEN THE TRANSMISSION SHIFTED.
    THIS HUMMING VIBRATION OCCURRED CONSISTENTLY BETWEEN 2200 AND 2500 RPM.
    HAVE YOU HAD THIS SAME EXPERIENCE WITH A TOYOTA SIENNA AND, IF SO, DID YOU FIND A CAUSE AND REMEDY?
  • ateixeiraateixeira Posts: 72,587
    First off, the 2GR engine now uses a timing chain, which is a bit noisier but more durable and more economical than a timing belt, which usually have to be replaced every 60k miles.

    The catch is timing chains are indeed noisier, so Toyota added some extra sound insulation in the firewall and in the door jambs. I have a picture of it and you can see it below.

    Now, about the increase in noise at certain RPM - this engine also has 2 intake paths. Normally one is open to minimize intake road, but when the throttle is more than half way down and above a certain RPM the 2nd path opens to get maximum power.

    You might be experiencing that valve opening and closing, effectively doubling the intake roar. And of course it varies according to RPM and throttle position.

    FWIW, I don't think the noise is that bad. I've actually modified mine so that both intake ports remain open all the time. A set of vacuum tubes operates these and a simple mod leaves them both open all the time. I'm basically trading off a bit more noise for better throttle response, less hesitation, and (some say) better gas mileage.

    PS I should note that the older 3.3l engine also has the dual port intake, but it uses a timing belt.
  • nilionnilion Posts: 2
    Thank you ateixeira - your explanation and picture are very much appreciated and, I believe, an accurate assessment of the humming vibration issue.
  • caravan2caravan2 Posts: 198
    [quote]I've actually modified mine so that both intake ports remain open all the time[/quote]

    How do you that? Does this really improve gas mileage? If so, by how much??

    Does this modification effects warranty? Did you do it yourself?

    I have 3.5 engine.

    Thanks,
  • ateixeiraateixeira Posts: 72,587
    It's fairly well detailed here:

    http://www.angelfire.com/ky3/gabby/intake_mod.htm

    The funny thing is that it almost didn't make sense to me. I can understand that freeing up the air intake would reduce hesitation and increase power under certain circumstances, but I didn't believe the improved mileage claim.

    Thing is, I just can't argue with results. I drove to the beach this weekend and averaged 30.6mpg for the (all highway) trip. Yowsah. :)

    That's better than I got doing the same trip in my Miata!

    And we had 4 people, a dog, a little bit of luggage, and the A/C was on the entire time (DC summers in July are hot/humid).

    I can't say exactly how much it improved my mileage because I've only had the van for 1700 miles. I did wait to do this until after the 1000 mile break-in.

    The mod is very, very simple. You disconnect two vacuum hoses and re-route one to another location. I took the additional step of getting caps so that everything was sealed nicely.

    Does it affect the warrranty? I'll answer "maybe". It's not stock, but it's very easy to reverse and there would be no signs of any mods. Plus, past half throttle the intake operates like this anyway. This just leaves it in that double-intake-path mode all the time. You don't have to wait for the vacuum tubes to operate and suck the 2nd intake path open, hence some people say it hesitates less (note I did not notice any hesitation prior to the change).

    So this is your call. If you want to try it, note your mileage on a certain trip. Then, take that same trip again after the mod, and see if you notice a difference. The site claims a 1-2mpg improvement. I seem to observe about that much improvement, but again, my engine is green and breaking in, and it might have improved even without this mod.

    Trade-off? More noise. My wife noticed it once, but we got used to it pretty fast, and I don't want to give up 30+mpg plus quicker throttle response, so to me it was worth it.
  • Hi!
    Does any now if the sienna can be converted to run on etanol (E85)fuel?
  • ateixeiraateixeira Posts: 72,587
    Anything's possible, the question is cost. I'm sure it would cost far more than it's worth.

    Plus, running on E85 actually costs more than running on gas.

    So you'd be spending money in order to be able to spend even more money.
  • Well not in sweden, here the E85 is much cheaper about 30%.
    the regular 95 octane is about 12 swekr and the E85 is 7.50 swekr.
  • ateixeiraateixeira Posts: 72,587
    Cool, didn't know that.

    Here the savings are very small, and you get less mileage so it actually ends up costing more to operate.
  • In the link you provide, the author states that the valve opens at 3200 RPM and over 30% throttle position. So this might not be the source of the humming noise between 2200 and 2500 RPM. I too have a 2007 Sienna which is very quiet below 2200 RPM, but hums/buzzes in the 2200 to 2500 RPM range. A long time ago, I had a Sentra SER make this sound, and it turned out to be the exhaust resonator which when replaced, fixed the noise. My Sienna noise is not so loud as to be bothersome, but I think it probably has to do with the exhaust system vibrating at that RPM due to resonant frequency response. Vehicle manufacturers design their exhaust systems so that they minimize resonance at most of the RPM range, but slight variations from car to car means that some will be louder than others.
  • fccn75fccn75 Posts: 2
    The SER was a very nice car: '92? 2.0, 140hp for the time was fantasitc!

    New to this site and glad to have found it after all this time googling on the humming issue with '07 Sienna LE without substantial results.

    Have 1700 miles and experienced the same exact issues: humming/moaning @ 2300-2500 rpm under load such as accelerating lightly but not enough to drop to the next lower gear. Especially noticeable on long stretch of inclines. The sound is very accurately described in your post - almost like a resonating exhaust vibration due to a resonate frequency in the narrow range of rpm. Don't know about the rest of the owners, but I find it very annoying when it does hum. Sounds almost as if I modified my exhaust system - and droning!

    I tend to lean toward the exhaust noise as opposed to the intake noise especially as described the VSV takes on >3200 rpm. Reminds me of my late '85 corolla gts (redlines at 7500rpm) where it would operate the second set of intake valves after 4200 rpm.

    Needless to say, I brought the van to the dealer for diagnostics and they were unable to find any problems. They informed me that they were unable to duplicate the noise which I had confirmed with one of mech. on a test drive. I guess this means that the noise is normal due to a design issue/flaw and that not too many drivers notice it.

    I'm glad to find out that there are owners that experience this noise and that this "problem" does exist. Now what to do about this?

    Wondering perhaps additional isolation engine mounts or something in the exhaust?

    Anyone knows of TSB regarding this?
  • siennamisiennami Posts: 116
    So that's why the 07 sounds so much louder? I was wondering about that when I test-drove the CE. I noticed that it seemed much louder than the 00 LE I drove a couple of years ago. One thing I've noticed is a little "hesitation" when I turn a corner. It could be my driving habits, but it seems a little weird. I've tried to be a little more conservative in my driving habits with this vehicle because of gas price concerns (you know, no jack rabbit take-offs, etc.), so I'm wondering about that "hesitation".
  • ateixeiraateixeira Posts: 72,587
    The 2GR is louder because it uses a timing chain, vs. a timing belt. Chains are noisier and have more reciprocal mass, but they don't have a service interval and are far less likely to break.

    Toyota compensated by adding extra insulation on the firewall and under the door sills, so while cruising my Sienna is still very quiet.

    Under full throttle it definitely asserts itself. But I like that. :shades:

    The hesitation may be the two-path intake. There's more information about that (and how to modify the intake if you are so inclined) here:

    http://www.angelfire.com/ky3/gabby/intake_mod.htm
  • caravan2caravan2 Posts: 198
    I hear groaning around approximately 2k RPM? After that either it goes down or engine noise is so much, it seems it is lower....

    Is this normal for Sienna?
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