Un intended acceleration issues

2654 Views 26 Replies 16 Participants Last post by pwned88, Apr 6, 2011

AKGC

Discussion Starter · Jan 20, 2011

Anybody have any issues with this, (I'm guessing the northern regions)?

I just had this happen to me twice in a 15 min span, with the TSC on.

I was at a stop sign stationary, and the car felt like it was wanting to go slightly, like a poorly adjusted throttlebody.

So I creeped (no pedal) and then suddenly It started to accelerate. I slam on the brakes, and it started to do a burnout for like 3 sec. If I wasn't paying attention. I would of ran over someone, seriously. Someone was crossing the street when it happened, the first time.

I think the TB was stuck for a sec.

1 - 20 of 27 Posts

Tim

· #2 · Jan 20, 2011

I bet that was a fun experience (sarcasm lol) im sort of a noob when it comes to the genesis but i know alot about cars in general, Since the genesis TB is electronic it sounds more like an electronic problem since you didnt touch the pedal when you started to "creep". If i recall correctly a couple of other people on here experienced the same thing and it turned out to be a TB or ECU malfunction.
hope this helps a little

Bobaguy

· #3 · Jan 20, 2011

Uh oh...

AKGC

Discussion Starter · #4 · Jan 20, 2011

<==== look at post count,

and I've already swapped in a new engine in this car... myself.

I'm no stranger to this car.

Tim

· #5 · Jan 20, 2011

Iv noticed that much, iv seen alot of ur name in alot of threads

i know you know alot about this car, and i know the motor wasn't necessarily a planned "mod" lol but it just sounds a little odd that the car would just accelerate with no pedal input and it being an electronic TB theres only a few possible solutions in my head lol but like i said b4 tho, i dont think your the only one who's experience this sort of thing with this car b4

seriousbusiness

· #6 · Jan 20, 2011

I am sad to say ive had a similar issue just recently. About a month ago as i was driving home on the free way i let off the gas but my car kept accelerating, mind you it was a very slow acceleration and it lasted only for about 3 seconds so i figured it may have been my floor mats pushing on the pedal so i adjusted them a bit. I didnt have a problem until a couple days ago when it was about -30 degrees Celsius out. At around 60 kph my throttle got stuck open a bit, i popped it into neutral to see if i was just imagining it but the car would redline continuously, it did this for about 2 mins straight and then stopped. About 30 seconds later it started doing it again when i was stopped at a red light, so i put it in gear and drove with my brake on for another block until it stopped. It hasnt happened again so far, im still hoping it was just a build up of ice or snow where the pedal and floor hinge together that was keeping my pedal open a bit. But it definitely makes me not want to drive my car if i dont have too.

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Red Raspberry

· #7 · Jan 20, 2011

Have you done the TB cooling line deletes?

TVONE2

· #8 · Jan 20, 2011

only seems to happen on automatic cars...

CrookedH

· #9 · Jan 20, 2011 (Edited)

My wifes had a surging issue way back when we first got it. Holding the brake down at a light, it wad pulling forward, revving up, etc. only did it once or twice.

http://www.gencoupe.com/2-0t/18147-surging-idle.html

AKGC

Discussion Starter · #10 · Jan 20, 2011

No coolant delete, automatic, 8*F warmed it up for like 3 mins.

The TB is spring loaded, motor only moves flap open. Motor doesn't do anything to close it. If flap gets stuck, I suspect that the throttle flap position is read by ECU and then there is the issue. So I suspect that the ECU doesn't read throttle position from the pedal directly.

I just recalled there being a TBS a while ago about cleaning the TB.

jeongyun

· #11 · Jan 21, 2011

AKGC said:
No coolant delete, automatic, 8*F warmed it up for like 3 mins.

The TB is spring loaded, motor only moves flap open. Motor doesn't do anything to close it. If flap gets stuck, I suspect that the throttle flap position is read by ECU and then there is the issue. So I suspect that the ECU doesn't read throttle position from the pedal directly.

I just recalled there being a TBS a while ago about cleaning the TB.

ECU reads driver input from APS(Accelerator Pedal Sensor) and then adjusts throttle using throttle motor. TPS(Throttle Position Sensor) signal is sent back to ECU to feedback actual throttle opening.

There are actually two APSes. ECU compares input from them. If they don't agree with each other, ECU will throw a diagnostic code and Check Engine Light will come on.

To me it's hard to think two APS went wrong at the same time or something. could be a glitch in the ECU firmware?

AKGC

Discussion Starter · #12 · Jan 21, 2011

Latest OEM flash

Grumple

· #13 · Jan 21, 2011

Wow, this is kinda scary, I feel like Hyundai should be looking into this because this could easily cause an accident and injure/kill someone.

mallen

· #14 · Jan 21, 2011

AKGC said:
Anybody have any issues with this, (I'm guessing the northern regions)?

I just had this happen to me twice in a 15 min span, with the TSC on.

I was at a stop sign stationary, and the car felt like it was wanting to go slightly, like a poorly adjusted throttlebody.

So I creeped (no pedal) and then suddenly It started to accelerate. I slam on the brakes, and it started to do a burnout for like 3 sec. If I wasn't paying attention. I would of ran over someone, seriously. Someone was crossing the street when it happened, the first time.

I think the TB was stuck for a sec.

Wait a second,this sound suspiciously like something my dealer warned me about. He said that under some conditions,especially in icy conditions with snow tires,(although presumably with any tires it COULD happen as the car does not know what kind of tires it has,only what kind of traction its getting,or really,the relative speed of the tires to each other) the engine will rev ,even going so far as reving to redline. I had this happen to me once without the snow tires actually,or at least I think I did. I started skidding around a corner and I took my foot off the accelerator. The engine revved and the car actually accelerated slightly,but also righted itself and came out of the skid. I'm not sure if its a good thing or not. If it does EXACTLY what happened to me,then its good,but if it sometimes does it when you could otherwise have regained control,its not. They said they had dozens of calls into Hyundais tech line and finally were told its a "feature"

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AKGC

Discussion Starter · #15 · Jan 21, 2011

feature my ass lol

dennis_david

· #16 · Jan 21, 2011

Ok so... Did all of you who "suffered" this acceleration have stock wheels and tires? Are all cars also automatic?

ControlFreak

· #17 · Jan 21, 2011

AKGC said:
Latest OEM flash

How long ago was it flashed?

RandomDestructn

· #18 · Jan 21, 2011

I hope it isn't time to make a genesis version of the Toyota simulator.

+1 on ECU glitch, I cant see both APSs erroring in the same way at the same time. Are there redundant sensors on the TB as well? If not it could be the pot (or optical pickup, whatever it uses) on the tb.

Could be frightening stuff though. I'll be watching this space.

dennis_david

· #19 · Jan 21, 2011 (Edited)

the tps has two signals coming out.

one goes from 0-5v and the other one form 5-0v

EDIT:

wasn't there a guy that had this issue happen with a taller than stock rear tire?
I'm thinking about the TCS logic...

AKGC

Discussion Starter · #20 · Jan 21, 2011

Flashed September.

winter wheels, but sized correctly and with OEM sensors.

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