Rev counter needle jumps when I accelerate and then come off gas pedal
#1
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I'm having an annoying problem with my IS250 from 2012. When I accelerate and come off the gas pedal, the engine rev dips briefly and comes back. It feels like when you tap the brake quickly. This seems happens only before the engine is fully warmed up and in any gear. Anyone know why it does this? ![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)
Here is a recording of this strange behaviour
![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)
Here is a recording of this strange behaviour
#3
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Im having this exact same problem. The rev dips when i accelerate from a stop light and have to let go of the gas to slow down. I don't have to step on the brake for this to happen. A good example is a scenario where I accelerate from a stop light and doing 40mph and have to let go of the gas to avoid hitting someone cutting me off.
#4
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edit:
By the way, I tried in S mode, snow mode, ECT power, same thing. It stops doing this when engine it fully warmed.
Last edited by UpSideDown; 02-07-17 at 09:53 PM.
#6
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Well, it didn't do this during the first 3 years of owning the car.
Just curious to know if this is a engine issue or transmission issue and how to fix it. I'm planning to keep the car few more years and don't want this gets worse and end up in a costly repair.
Just curious to know if this is a engine issue or transmission issue and how to fix it. I'm planning to keep the car few more years and don't want this gets worse and end up in a costly repair.
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#8
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I'm going to service my car soon anyway, so if it is a problem and this isn't normal I'll as them about it and see.
#9
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When I drive my car when the engine is cold, sometimes it won't shift up until you rev it up to 2000 - 2500 RPM per gear, and if you so much as tap the brake pedal, it will downshift immediately. Your comments about the RPM going up and down as you let off the gas pedal are basically all things I've noticed in my car as well. And since you said they only happen when the car is cold, my best guess is the car does that to heat the engine / transmission faster. I could be wrong though. I think the strangest thing is that you said it hasn't done that before.
I'm going to service my car soon anyway, so if it is a problem and this isn't normal I'll as them about it and see.
I'm going to service my car soon anyway, so if it is a problem and this isn't normal I'll as them about it and see.
#10
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Anyone else into mechanics knowledge know what this can be? I will get the car serviced soon and will bring this up with the service guys. But it would be great to hear your thoughts on this too!
#11
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Thanks for your clarification. But I think it's the different issues we are talking about. If you watch my video again you see that when I accelerate pass 2000 rpm and let go of the gas, the rpm falls back to around 1500 rpm, which it normal. But then the rpm briefly dips to 1000 rpm and bounce back to 1500 rpm again. And I was in 6th gear. This never happened in the first 3 years I had the car. I bought it brand new.
Just ask your service guys next time you take your car in.
#12
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#13
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Yeah, that's exactly the same behavior. It does this only when you accelerate carefully within the same gear. I'll bring this up with service manager later when it's time for service. My car is out of warranty, I'm sure they will tell me what's wrong so they can charge me an arm and leg for it.
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#15
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Canadian Lexus Eh ? damn Canadian 2011 Lexus IS350 AWD here, this happened after awhile till i got the car, bought brand new, probably i bought it in March and it was warm so i didn't notice it, yes in Ontario its kind cold someday and my car does the samething "IF THE CAR IS NOT FULLY WARMED UP" even if the car is warmed when i drive for like 50 meters and stop at the Red Light in gear D + braking, the car wanna lean forward i have to PRESS THE BRAKE PADDLE HARD for like less than 1 minutes until the RPM calm down and then everything back to NORMAL. I did a research on here and there is a post saying the same with 2014+ model IS/GS and they are all Canadian Lexus cars.
I had RPM surging issue lately too but i figured out it was the bad Gas from ESSO, i only use TOP grade gas, back to the topic, so whenever it's really really cold the Lexus RPM acts weird ? i always warm up my car 7-10 mins before i drive in the winter time. Any pro got any solution ?
I had RPM surging issue lately too but i figured out it was the bad Gas from ESSO, i only use TOP grade gas, back to the topic, so whenever it's really really cold the Lexus RPM acts weird ? i always warm up my car 7-10 mins before i drive in the winter time. Any pro got any solution ?