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08 toyota Sienna knocking sound during start


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tigerw
User

Jan 13, 2015, 8:25 AM

Post #1 of 19 (1294 views)
08 toyota Sienna knocking sound during start Sign In

I have a 08 toyota estima ie sienna behaves strangely. It's having a startup knocking sound after I park it for more than 30 mins. The sound seem to come from undercarriage.

However there is no sound if i start up less than 30 mins. Neither do I start up in the morning. Pls help.Awful sound from toyota estima:

http://youtu.be/NTV4OKSE9cM

(This post was edited by tigerw on Jan 13, 2015, 9:22 AM)


Tom Greenleaf
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Jan 13, 2015, 8:49 AM

Post #2 of 19 (1289 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Please let me know if I understand this properly. It will make this "knock" if parked for more than 30 minutes, go away then not make the noise if parked overnight?


Noises are always a tough call and this is no exception. It's odd to me that stone cold as in overnight it wont make the noise so extra tricky.


Seems some range of temperature is the factor as a beginning guess and things to check and do.


I would check and likely change out oil for a synthetic (anyway) with exact proper viscosity suggested for it. Check list would also include motor mounts, exhaust parts and shields of all sorts many can be found tapping on parts of exhaust or even shaking parts with a glove or wiggle on tail pipe?
It may not be an internal engine anything at all which is why I would change out the oil. IMO if internal that would likely change the noise for better or make it worse. If old oil shows anything odd it should be noted - save some or if a clear problem noted right away with something with the oil note that and describe it.


Part of the confusion is the word "knock" being used. Most think of something very wrong with an engine but so far not conclusive with when this happens and that it goes away,


T



tigerw
User

Jan 13, 2015, 9:26 AM

Post #3 of 19 (1282 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Yes. U are right there is no sound I park over night.
I'd upload a youtube video that could be helpful.

http://youtu.be/NTV4OKSE9cM


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 13, 2015, 9:36 AM

Post #4 of 19 (1278 views)
Re: 08 toyota Sienna knocking sound during start Sign In

That would help but didn't show in that format? Gave me this...........
"No results found for http://youtu.be/NTV4OKSE9cM."


While here. Is this noise just a one time knock just the time it's cranking to start or for some time AFTER it starts? That would change where I would go next which would be if the starter itself has a problem and more right there,


T



Hammer Time
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Jan 13, 2015, 10:08 AM

Post #5 of 19 (1273 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Your video is set for private and can't be viewed publicly.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tigerw
User

Jan 13, 2015, 10:35 AM

Post #6 of 19 (1269 views)
Re: 08 toyota Sienna knocking sound during start Sign In

http://www.youtube.com/watch?v=NTV4OKSE9cM&sns=em

I hope this will work as its my first time uploading youtube.
Anyway the sound comes AFTER I start the car. The series of cranking and knocking noice lasts for 1-2 sec. After that it will go away.

If i turn off the engine and restart the car immediately, the noice will go away too. Unfortunately it will come back after 30 mins.


Tom Greenleaf
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Jan 13, 2015, 10:44 AM

Post #7 of 19 (1266 views)
Re: 08 toyota Sienna knocking sound during start Sign In

http://www.youtube.com/...V4OKSE9cM&sns=em > is a no show again?


OK - Let's try to understand this. Does this noise ONLY make a peep when starter is cranking then quit? Can it continue after starter released some times then sometimes not do it at all?


For link to YouTube could be different in your device and mine. I can just copy/paste the browser bar and it will only go to exactly what you were looking at or I was when done that way. I'll never know how each device does what?


T



Hammer Time
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Jan 13, 2015, 1:29 PM

Post #8 of 19 (1254 views)
Re: 08 toyota Sienna knocking sound during start Sign In

You still have your settings set to private, not public so no one but you can see it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tigerw
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Jan 13, 2015, 4:43 PM

Post #9 of 19 (1250 views)
Re: 08 toyota Sienna knocking sound during start Sign In

I managed to change the settings to public. Maybe it is easier to have look in the real recordings.

Thanks


Tom Greenleaf
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Jan 13, 2015, 5:13 PM

Post #10 of 19 (1245 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Works now..... https://www.youtube.com/...V4OKSE9cM&sns=em


Was fast but to me sound like a split second of oil pressure building up but can't be sure. Not conclusive to me but still suggest changing out oil as it did seem like a possible oil/oil pressure issue,



Hammer Time
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Jan 13, 2015, 5:14 PM

Post #11 of 19 (1243 views)
Re: 08 toyota Sienna knocking sound during start Sign In

That sounds like mild rod knock until the engine builds up oil pressure. You might try changing the oil to a different brand or add some heavy oil treatment, the molasses type stuff.

Your rod bearing probably have a lot of wear and they are rattling around until the oil pressure builds up.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Jan 13, 2015, 5:22 PM

Post #12 of 19 (1241 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Quick hits with same thoughts Hammer. Sounded like when changing oil and waiting for oil pressure to fill filter before shutting up type noise to me. Not good as we know if so and to me if just that should be much worse the longer it's been without running not as quick as has been reported or so intermittent? T



tigerw
User

Jan 13, 2015, 6:28 PM

Post #13 of 19 (1234 views)
Re: 08 toyota Sienna knocking sound during start Sign In

So it could not be the starter?


Hammer Time
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Jan 13, 2015, 6:30 PM

Post #14 of 19 (1233 views)
Re: 08 toyota Sienna knocking sound during start Sign In

It sounded to me like that noise occurred after the engine was running



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tigerw
User

Jan 13, 2015, 6:56 PM

Post #15 of 19 (1231 views)
Re: 08 toyota Sienna knocking sound during start Sign In

But again the problem does not occur during morning start. It only occurs 30 mins or more after some driving.


Hammer Time
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Jan 13, 2015, 7:07 PM

Post #16 of 19 (1227 views)
Re: 08 toyota Sienna knocking sound during start Sign In


Quote
It only occurs 30 mins or more after some driving.


That's confusing. Do you mean after a warm engine is shut off for 30 minutes?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tigerw
User

Jan 13, 2015, 7:27 PM

Post #17 of 19 (1225 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Yes. It only occurs after warm engine is shut off for more than 30 mins or so. Ie. if I restart the car within 30 mins, the noice will not be there.


Hammer Time
Ultimate Carjunky / Moderator
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Jan 13, 2015, 7:30 PM

Post #18 of 19 (1222 views)
Re: 08 toyota Sienna knocking sound during start Sign In

That's because all the oil hasn't drained back into the crankcase yet. As I said, changing the oil and filter to a different brand oil and better filter may help.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Jan 14, 2015, 5:55 AM

Post #19 of 19 (1206 views)
Re: 08 toyota Sienna knocking sound during start Sign In

Maybe you could install an oil pressure gauge to see how fast the oil pressure comes up when you start the engine. It also could be the famous VVT knocking noise those where known for. You would need to figure out where the noise is coming. If it is VVT, it would be loudest at the timing chain cover.





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(This post was edited by Discretesignals on Jan 14, 2015, 5:56 AM)






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