Just changed my oil & filter...bets on whether it hesitates??
08-14-14, 09:53 AM
#17
There is some question in this thread about cam phasing on these engines. The intake cam is varied electrically and the exhaust cam is varied using oil pressure. I read that on shutdown, the intake cam is advanced to increase valve overlap which makes the engine easier for the starter to turn.
This is a good article.
http://youdiyauto.blogspot.com/2012/...rtup-tick.html
I'm going to place my bets on an oil related deposit problem which can possibly cause this issue soon as the engine oil has been changed until the initial cleaning of the oil has settled down.
Those VVT oil passages are pretty tight.
Last edited by Devh; 08-14-14 at 10:00 AM.
08-14-14, 10:35 AM
#18
There is some question in this thread about cam phasing on these engines. The intake cam is varied electrically and the exhaust cam is varied using oil pressure. I read that on shutdown, the intake cam is advanced to increase valve overlap which makes the engine easier for the starter to turn.
I went ahead and read some of the specs for the VVT technology for this engine and yes it does seem that the exhaust cam is pressure lubrication dependent.
This is a good article.
http://youdiyauto.blogspot.com/2012/...rtup-tick.html
I'm going to place my bets on an oil related deposit problem which can possibly cause this issue soon as the engine oil has been changed until the initial cleaning of the oil has settled down.
Those VVT oil passages are pretty tight.
This is a good article.
http://youdiyauto.blogspot.com/2012/...rtup-tick.html
I'm going to place my bets on an oil related deposit problem which can possibly cause this issue soon as the engine oil has been changed until the initial cleaning of the oil has settled down.
Those VVT oil passages are pretty tight.
08-14-14, 07:55 PM
#19
Lexus Fanatic
Thread Starter
Good info boys.
So after driving home last night and driving in today, the issue did not crop up again. So in summary , it happened once only. I added two bottles of Rislone Engine Treatment to the oil (2x500 ml). The reason I did this was to see if it would quiet the lifters enough to fool the overly sensitive knock sensor on these cars. I also sent in my oil sample today to Blackstone. Curious to see what it says.
So after driving home last night and driving in today, the issue did not crop up again. So in summary , it happened once only. I added two bottles of Rislone Engine Treatment to the oil (2x500 ml). The reason I did this was to see if it would quiet the lifters enough to fool the overly sensitive knock sensor on these cars. I also sent in my oil sample today to Blackstone. Curious to see what it says.
08-14-14, 08:28 PM
#20
Good info boys.
So after driving home last night and driving in today, the issue did not crop up again. So in summary , it happened once only. I added two bottles of Rislone Engine Treatment to the oil (2x500 ml). The reason I did this was to see if it would quiet the lifters enough to fool the overly sensitive knock sensor on these cars. I also sent in my oil sample today to Blackstone. Curious to see what it says.
So after driving home last night and driving in today, the issue did not crop up again. So in summary , it happened once only. I added two bottles of Rislone Engine Treatment to the oil (2x500 ml). The reason I did this was to see if it would quiet the lifters enough to fool the overly sensitive knock sensor on these cars. I also sent in my oil sample today to Blackstone. Curious to see what it says.
You can also try an engine flush before your next oil change that is made by Amsoil which is also a dispersant. Other flushes on the market can cause more harm then good.
On your next oil change I would highly recommend using the specially formulated Synthetic from Toyota. Because of this thread I now understand Toyota's rational for having a very high viscosity index compared to other oils.
08-14-14, 09:33 PM
#21
Lexus Fanatic
Thread Starter
08-15-14, 07:29 PM
#25
Lexus Fanatic
Thread Starter
UPDATE:
I'm pretty stroked right now! After the one hesitation following the oil change (and a minor hesitation at that), There has been no return of the issue. Not only that, but power and smoothness/linearity of response is so much better. While I'm not a believer in "snake oils", I can only attribute the improvement to the Rislone I added in desperation. Perhaps it cleaned and dislodged something in the VVT system as noted by Devh, or maybe it's the "placebo effect" and all in my imaginationm, LOL. Regardless, the hesitation is GONE.
In summary, this rules out viscosity and dino vs syn oils, since this time and last time I used the same 5w20 synthetic. The only difference from my previous oil change, (when the hesitaton was unbearable for several weeks), was that I used a Toyota filter rather than Fram and these two bottles of Rislone. Here is the product:
http://rislone.ca/catalog/view/45-en...centrate-34102
I will update if anything changes, but so far, I am in love with my car again!
I'm still going to proceed with the ECU revision/update through my dealer soon.
I'm pretty stroked right now! After the one hesitation following the oil change (and a minor hesitation at that), There has been no return of the issue. Not only that, but power and smoothness/linearity of response is so much better. While I'm not a believer in "snake oils", I can only attribute the improvement to the Rislone I added in desperation. Perhaps it cleaned and dislodged something in the VVT system as noted by Devh, or maybe it's the "placebo effect" and all in my imaginationm, LOL. Regardless, the hesitation is GONE.
In summary, this rules out viscosity and dino vs syn oils, since this time and last time I used the same 5w20 synthetic. The only difference from my previous oil change, (when the hesitaton was unbearable for several weeks), was that I used a Toyota filter rather than Fram and these two bottles of Rislone. Here is the product:
http://rislone.ca/catalog/view/45-en...centrate-34102
I will update if anything changes, but so far, I am in love with my car again!
I'm still going to proceed with the ECU revision/update through my dealer soon.
08-15-14, 08:54 PM
#27
Lexus Fanatic
Thread Starter
I still wouldn't rule out viscosity until you do an oil change with 0w20.
08-16-14, 06:33 AM
#28
UPDATE:
I'm pretty stroked right now! After the one hesitation following the oil change (and a minor hesitation at that), There has been no return of the issue. Not only that, but power and smoothness/linearity of response is so much better ....... Regardless, the hesitation is GONE.
I'm pretty stroked right now! After the one hesitation following the oil change (and a minor hesitation at that), There has been no return of the issue. Not only that, but power and smoothness/linearity of response is so much better ....... Regardless, the hesitation is GONE.
In fact, one could argue that you now owe me those doughnuts!
08-16-14, 08:05 AM
#29
UPDATE:
In summary, this rules out viscosity and dino vs syn oils, since this time and last time I used the same 5w20 synthetic. The only difference from my previous oil change, (when the hesitaton was unbearable for several weeks), was that I used a Toyota filter rather than Fram and these two bottles of Rislone. Here is the product:
In summary, this rules out viscosity and dino vs syn oils, since this time and last time I used the same 5w20 synthetic. The only difference from my previous oil change, (when the hesitaton was unbearable for several weeks), was that I used a Toyota filter rather than Fram and these two bottles of Rislone. Here is the product:
This is also the reason why those that switch to the Toyota synthetic oil also have this issue. If the car was run after the initial break in with Synthetic oil you should not have this issue.
BTW Risione is only a temporary fix as the problem will come back if you don't use it regularly. If you use it regularly you risk displacing the oil additives.
Fram is the worst oil filter manufacture out there. Avoid Fram at all costs as they are know to not be made with good materials and there are many incidences with collapsed filters. Denso makes some of the best oil filters right up there with Bosh which also has a great reputation.
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DrQuality (08-08-21)
08-16-14, 12:27 PM
#30
Lexus Test Driver
I am using the 0-20w and i have had hesitation for atleast 1000 miles but it doesn't happen all the time its almost gone though as it comes and goes, sometimes this car drives like a rape ape and with the hesitation it is very unsmooth. although KK is fresh they are not filling come to seattle and get some top pot donuts, maple bar with bacon on it.