Accelerator takes off while stopped - LotusTalk - The Lotus Cars Community
 
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post #1 of 17 (permalink) Old 07-08-2019, 02:27 PM Thread Starter
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Accelerator takes off while stopped

Has anyone experienced while pulling into a parking spot, you stop, and that your foot is on the brake peddle and the accelerator just starts to take off (increase fast).
It's happened to me twice, but fortunately I had my foot on the brake peddle and caught it soon enough to press the park button or shut the car off.

But scared me, as it wants to leap forward at an ever increasing throttle level.


Thanx.
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post #2 of 17 (permalink) Old 07-08-2019, 05:27 PM
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Well, THATíS terrifying! Sounds a lot like the Toyota issue from a while back with sudden acceleration. This has not ever happened to me. What model year Evora do you have? Also, because you mentioned Park, Iím assuming IPS or auto (if a 400)?

Does the engine act as though youíre flooring it or just casually applying throttle? I know back when I was on a spirited drive, I had regular tennis shoes on and they were wide enough to hit the brake and the gas at the same time and I went into a turn too fast as a result. I went into the gravel a bit but nothing else. From that point on I only wear driving shoes so I can feel exactly where my foot is touching and so that my foot is that much more narrow. Is it possible your foot was catching the edge of the gas pedal? This is why Iím wondering if it acted as if it was floored.

I guess to check all the boxes, make sure itís not possible for your floor mat or anything else on the floor to catch a pedal. Then I would mention something to the dealer next time youíre in for service and make sure your ECU and TCU software is up to date. Iím not sure what you can do mechanically, but maybe clean the throttle body and the valve? I donít know where the throttle body position sensor is, but maybe that can be cleaned? Iím guessing at this point.

Bottom line: sudden lurching and acceleration isnít normal.

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post #3 of 17 (permalink) Old 07-09-2019, 03:44 AM
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Originally Posted by ShadowWulf369 View Post
Well, THATíS terrifying! Sounds a lot like the Toyota issue from a while back with sudden acceleration. This has not ever happened to me. What model year Evora do you have? Also, because you mentioned Park, Iím assuming IPS or auto (if a 400)?

Does the engine act as though youíre flooring it or just casually applying throttle? I know back when I was on a spirited drive, I had regular tennis shoes on and they were wide enough to hit the brake and the gas at the same time and I went into a turn too fast as a result. I went into the gravel a bit but nothing else. From that point on I only wear driving shoes so I can feel exactly where my foot is touching and so that my foot is that much more narrow. Is it possible your foot was catching the edge of the gas pedal? This is why Iím wondering if it acted as if it was floored.

I guess to check all the boxes, make sure itís not possible for your floor mat or anything else on the floor to catch a pedal. Then I would mention something to the dealer next time youíre in for service and make sure your ECU and TCU software is up to date. Iím not sure what you can do mechanically, but maybe clean the throttle body and the valve? I donít know where the throttle body position sensor is, but maybe that can be cleaned? Iím guessing at this point.

Bottom line: sudden lurching and acceleration isnít normal.
Assessment probable; Below info Re: Toyota's "problem"
Link:
[Search domain http://www.edmunds.com/car-safety/fo...ttlement.html] https://www.edmunds.com/car-safety/f...nded-accelerat

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post #4 of 17 (permalink) Old 07-09-2019, 04:33 AM
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Originally Posted by chrislynn5 View Post
Has anyone experienced while pulling into a parking spot, you stop, and that your foot is on the brake peddle and the accelerator just starts to take off (increase fast).
It's happened to me twice, but fortunately I had my foot on the brake peddle and caught it soon enough to press the park button or shut the car off.

But scared me, as it wants to leap forward at an ever increasing throttle level.


Thanx.
If you're stopped and it's safe to do so while the condition is occurring, look down and see if anything is touching the accelerator pedal. There have been several times where my foot has caught both pedals and caused a similar condition.

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post #5 of 17 (permalink) Old 07-09-2019, 05:23 AM Thread Starter
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Assessment probable; Below info Re: Toyota's "problem"
Link:
[Search domain http://www.edmunds.com/car-safety/fo...ttlement.html] https://www.edmunds.com/car-safety/f...nded-accelerat
One link appears dead, the other is just the settlement. Is there anything that describes the issue in detail? Thanx.
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post #6 of 17 (permalink) Old 07-09-2019, 05:25 AM
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The same thing happened to me and it turned out to be the floormat. I don’t use the stock Evora mats, but an aftermarket custom brand. It slid forward just enough and hooked the pedal. Scared the crap out of me. Now I check them every time.
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post #7 of 17 (permalink) Old 07-09-2019, 05:27 AM Thread Starter
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If you're stopped and it's safe to do so while the condition is occurring, look down and see if anything is touching the accelerator pedal. There have been several times where my foot has caught both pedals and caused a similar condition.
Now that it has happened a second time I'm going to watch this closer. The first time I thought the same, that I fat footed it. But I checked for anything hitting or touching the throttle, i.e. floor mat, etc.

What is weird is that it happened twice in the same manner. While pulling into a parking spot and then coming to a stop, while foot on brake, accelerator takes off (ramping up).

I would have expected this to occur at other times if me...

Thanx.
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post #8 of 17 (permalink) Old 07-10-2019, 03:42 AM
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One link appears dead, the other is just the settlement. Is there anything that describes the issue in detail? Thanx.
A simple web search renders many references ...............

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post #9 of 17 (permalink) Old 07-10-2019, 07:36 AM
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A simple web search renders many references ...............
Little relationship to Toyota as the ECU is a Lotus item

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post #10 of 17 (permalink) Old 07-10-2019, 07:51 AM
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IPS?

I wonder if it is actually a torque converter or trans issue and the ecu trying to maintain idle speed
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post #11 of 17 (permalink) Old 07-10-2019, 08:13 AM
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Originally Posted by exigegus View Post
IPS?

I wonder if it is actually a torque converter or trans issue and the ecu trying to maintain idle speed
It could be integrator windup (idle speed is too low for a long time then the throttle overcompensates), but my wager would be on operator error/floormats. Even the software I worked on almost a decade ago had robust checks where it would kill the show if the throttle ever acted funny, and this was prior to the Toyota fiasco.

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post #12 of 17 (permalink) Old 07-10-2019, 10:47 AM
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It could be integrator windup (idle speed is too low for a long time then the throttle overcompensates), but my wager would be on operator error/floormats. Even the software I worked on almost a decade ago had robust checks where it would kill the show if the throttle ever acted funny, and this was prior to the Toyota fiasco.
The first unintended acceleration was with Audi, but after almost destroying the company in the US market it was an operator issue. No car has a motor stronger than the brakes.

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post #13 of 17 (permalink) Old 07-10-2019, 11:15 AM
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The first unintended acceleration was with Audi, but after almost destroying the company in the US market it was an operator issue. No car has a motor stronger than the brakes.
In spite of that, I expect that it is much harder to actuate vacuum servoed brakes when the throttle is wide open and vacuum drawn from the manifold is lost. but maybe modern cars have a different servo mechanism so they don't lose efficiency through pumping losses.
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post #14 of 17 (permalink) Old 07-10-2019, 01:56 PM Thread Starter
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yep, since my foot was on the brakes already to park I was able to push harder when it started to accelerate.
Scares the crap out of you though. I quick pressed park and turned the engine off each time.

I'll watch to see if mats, etc. but I don't see the way.
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post #15 of 17 (permalink) Old 07-10-2019, 03:39 PM
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The first unintended acceleration was with Audi, but after almost destroying the company in the US market it was an operator issue. No car has a motor stronger than the brakes.
In spite of that, I expect that it is much harder to actuate vacuum servoed brakes when the throttle is wide open and vacuum drawn from the manifold is lost. but maybe modern cars have a different servo mechanism so they don't lose efficiency through pumping losses.
The way the brake booster is designed it actually holds its own vacuum and is good for 2 to 3 full brake applications without engine vacuum.

Next time your in your car pump the brakes before you start the car. The first 2 should feel 100% normal.

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post #16 of 17 (permalink) Old 07-11-2019, 02:45 AM
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The way the brake booster is designed it actually holds its own vacuum and is good for 2 to 3 full brake applications without engine vacuum.

Next time your in your car pump the brakes before you start the car. The first 2 should feel 100% normal.
i tried this today in my Subaru, and it behaved just like you said. I'm certain I've experienced this before, but i never made the realization that it was because the car held a vacuum reservoir. I'm amazed that the car can hold vacuum overnight.
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post #17 of 17 (permalink) Old 07-11-2019, 03:29 AM
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Little relationship to Toyota as the ECU is a Lotus item
Most of the articles relate the "cause" to your post #12, as I attempted to point out, and a cause with which I agree is probable..........ECU cause improbable as investigations noted................

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