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Acceleration Problems after Dealer Oil Change

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Old 06-07-14, 11:29 PM   #91
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wow..did not realize this was actually a big issue.


I actually had the same thing but it went away quickly. After i sent my car in first time to Lexus for techstream brake flush and then picked it up, when i initially stepped on gas there was MUCH hesitation. I was about to bring it up to lexus but it went away within 2/300 yards of driving.


Yikes, i just hit 81K and barely missed the emissions warranty. I'll see if my adviser can give this complimentary. I just spent over $4K there last month! I hope they don't think the premium coffee and donuts satisfy my wallet.
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Old 08-02-14, 06:59 PM   #92
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I'm having the same problem with my 2007 LS460 at 91K after it received a major maintenance service at Lexology in Redondo Beach, CA this past Tuesday, July 29th. I am glad I purchased extra warranty when I purchased it pre-owned. I am hoping whatever is wrong, they will fix or change the necesarry parts and hopefully the warranty will cover it.
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Old 10-18-14, 03:06 PM   #93
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Is this issue mainly happening to 07's? Not everyone is listing their vehicle year.
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Old 10-18-14, 03:28 PM   #94
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2007 and certain 08 models suffer from the head problem. From what I understand. Valve lash. Maybe another name for it too. In essence, the problem with the valves / heads causes the knock sensor to detect engine knock and it retards the timing killing power and acceleration.
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Old 10-18-14, 10:41 PM   #95
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The problem seems to have been conquered by using the correct and proper oil. To be specific, Toyota 0W20 synthetic. I had the issue twice after using two different brands of synthetic in 5W20 viscosity. I then did another change and added two bottles of Rislone Engine Treatment and the hesitation disappeared. It seems the VVT-I system and perhaps the anti-knock sensor are very sensitive to different oils. Once the Rislone has done it's thing, I will use a can of Toyota Engine Oil System cleaner and then fill up with the Toyota oil.

Devh (member here at CL), did a lot of research into this and can better speak to the issue. I'm ecstatic that I've addressed the problem. The added bonus is I no longer consume any more oil between changes and the engine is soooooo smooth now.
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Old 10-20-14, 06:56 AM   #96
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I'm glad that's working for you roadfrog but I doubt it will be permanent. If Lexus could correct the problem with oil they would not be rebuilding so many heads. Your are not covered under the recall or some extra warranty?
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Old 10-20-14, 07:32 AM   #97
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Quote:
Originally Posted by Lavrishevo View Post
I'm glad that's working for you roadfrog but I doubt it will be permanent. If Lexus could correct the problem with oil they would not be rebuilding so many heads. Your are not covered under the recall or some extra warranty?
Fair enough. But so far so good. I'm no longer covered by any warranty.

The good news is I'm no longer consuming any oil and my car is running ohhh sooo smooth.

Also, many who did the head recall/warranty work still had the same issues afterwards, so even Lexus doesn't really know what the issue is. However, it seems they have associated the VVT-I system and anti-knock sensor as culprits and there is info I've been finding that suggest it all has to doi with oil, filter screens in the VVT-I system, additives in the Toyota specifically designed for the VVT-I, etc etc.

Guess we'll see on my next oil change, but like I said, this last oil change has me optimistic.
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Old 10-20-14, 04:22 PM   #98
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Quote:
Originally Posted by roadfrog View Post
Fair enough. But so far so good. I'm no longer covered by any warranty.

The good news is I'm no longer consuming any oil and my car is running ohhh sooo smooth.

Also, many who did the head recall/warranty work still had the same issues afterwards, so even Lexus doesn't really know what the issue is. However, it seems they have associated the VVT-I system and anti-knock sensor as culprits and there is info I've been finding that suggest it all has to doi with oil, filter screens in the VVT-I system, additives in the Toyota specifically designed for the VVT-I, etc etc.

Guess we'll see on my next oil change, but like I said, this last oil change has me optimistic.
Wait, you haven't had the recall done? Or you have and it's not made a difference?

The thing I don't get is why you were consuming oil and now you aren't...I wonder if you had a ring hanging up and you freed it up with your new oil? It almost sounds like your engine might of been really dirty...lack of flow through the VVT and the oil consumption. Did you go a long time on a previous oil change, or take it to a place that put conventional oil in it?
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Old Yesterday, 12:44 PM   #99
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Here you go. This is a link to the recall.

http://jalopnik.com/5581813/lexus-re...-valve-springs
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