Rough Running Engine
Driver School Candidate
Joined: Oct 2021
Posts: 6
Likes: 0
From: MI
Wow, this is the EXACT same noise my 2016 450h is experience on some starts. Mine is a little louder and more violent, but after about ~20sec of idling the engine smooths out and it is fine. It is a CPO so I am taking it to the dealer. When you were having this issue, there were no CEL or warning displayed on your dash correct? Mine does not, just the audible engine noise and shaking.
Driver School Candidate
Joined: Oct 2021
Posts: 6
Likes: 0
From: MI
Recently took the car in specifically for this problem. Previously looked at during two other scheduled services. Upon initial start of the car where: the car is turned on, there is a pause as the car initializes and finally the engine will start up. It is at this point where the engine stumbles badly. Sometimes it is very rough and there is some "clacking" noise coming I think from the engine bay. The car will stumble and proceed running rough as I drive away. The car will stumble upon moderate acceleration. At times during other parts of the day, the issue is less pronounced however the engine seems to miss while idling or slow maneuvers from a parking spot. Also, at normal operating temperatures, the engine does not turn off at a stop which I believe happens normally with the hybrid. Other times it does turn off. These symptoms will disappear and then reoccur without any clear common denominator.
Dealer again ran diagnostics without any revelations. They also contacted Lexus corporate offices for any additional information. No definitive cause only to say that it seems to be a fuel issue. I've only used top-tier premium grade fuel. Prior to bringing the car to service I ran two tanks of Chevron Techron fuel system cleaner to see if I could clear the situation up. Not so and therefore I took the car in for service.
I am try to stay with one brand of gas to see if I can narrow down any fuel problem but the stumbling continues.
Any comments on similar experiences is appreciated.
Dealer again ran diagnostics without any revelations. They also contacted Lexus corporate offices for any additional information. No definitive cause only to say that it seems to be a fuel issue. I've only used top-tier premium grade fuel. Prior to bringing the car to service I ran two tanks of Chevron Techron fuel system cleaner to see if I could clear the situation up. Not so and therefore I took the car in for service.
I am try to stay with one brand of gas to see if I can narrow down any fuel problem but the stumbling continues.
Any comments on similar experiences is appreciated.
I had my injectors replaced through tsb: L-SB-0045-12. My ‘17 feels much better and the stumbling seems to have stopped. But, as others have mentioned, it will likely come back.
I think I will use a fuel injector cleaners ever 5k.
Since the injectors were being removed (~45k), the dealership agreed to change the spark plugs for a nominal fee.
I think I will use a fuel injector cleaners ever 5k.
Since the injectors were being removed (~45k), the dealership agreed to change the spark plugs for a nominal fee.
Rookie
Joined: Oct 2010
Posts: 27
Likes: 10
From: down
No CEL or codes will be triggered by this symptom................ a few months on and all is perfectly smooth at start up . Dont let anyone tell you different if you have this start behaviour . I suppose it woud cost quite a bit to get a garage to clean them . Luckily i can do it myself .
Rookie
Joined: Oct 2010
Posts: 27
Likes: 10
From: down
I had my injectors replaced through tsb: L-SB-0045-12. My ‘17 feels much better and the stumbling seems to have stopped. But, as others have mentioned, it will likely come back.
I think I will use a fuel injector cleaners ever 5k.
Since the injectors were being removed (~45k), the dealership agreed to change the spark plugs for a nominal fee.
I think I will use a fuel injector cleaners ever 5k.
Since the injectors were being removed (~45k), the dealership agreed to change the spark plugs for a nominal fee.
Driver School Candidate
Joined: Oct 2021
Posts: 6
Likes: 0
From: MI
Just got back from the dealer today. They took the car back and agreed to replace all 6 injectors under warranty according the TSB mentioned here and in other threads. Glad to have this taken care of with no out of pocket costs. Surprised Lexus has not made this a recall.
Last edited by slagathor; Oct 13, 2021 at 08:38 AM. Reason: Changed response
Just got back from the dealer today. They took the car back and agreed to replace all 6 injectors under warranty according the TSB mentioned here and in other threads. Glad to have this taken care of with no out of pocket costs. Surprised Lexus has not made this a recall.
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Driver School Candidate
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