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Car applies gas and accelerates by itself, then stops

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Old 01-26-2017, 04:18 AM
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Zod
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CLS55 2006, CLS 63S 2015
Exclamation Car applies gas and accelerates by itself, then stops

As the title states, it first happened to me in traffic, I was hearing the engine/ drive line engaging, as if it would when you put your foot on the gas...but thing is, my foot wasn't.

So I was at a complete stop, traffic opened up a little and I let the car coast from a stand still and to my surprise it moved as if gas was applied up to just about over 1k rpm and then stops, then it would repeat its self again after a brief period.

Any one face this? its as if you are driving a manual car and it does it not to stall, but with out your intervention

Put car in drive and let it drive it's self and see how your RPM acts

In the vid right at the start top right corner, you see the van informant of me move, here I let off the brakes and rest is all the car..and no distroinc is no engaged

Replicated it on an empty road and happens as well


Went to get it checked at dealer, no codes stored and are baffled as to what is happening

Last edited by Zod; 01-26-2017 at 04:23 AM.
Old 01-26-2017, 09:30 AM
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"Creeping" is normal, the variation in speed/RPM is not. I wonder if you have a vacuum issue or something else that is causing rough idle, which, when the gear is engaged causes you to accelerate.
Old 01-26-2017, 09:36 AM
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2014 E63s 1993 mazda rx7 on Boost
Was your A/C on

Engine RPM with change with the A/C turning on/off.
Old 01-27-2017, 09:30 AM
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Zod
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Originally Posted by sunil517
Engine RPM with change with the A/C turning on/off.
It was on, but eco is off. So no turning off and on

''looney100''
I to thought it might be a leak, but car idles fine. Its just that if left to its self, as you state creep, it over creeps then backs off

Other then that car is more then fine

Last edited by Zod; 01-27-2017 at 09:35 AM.
Old 01-27-2017, 10:06 AM
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2014 E63s 1993 mazda rx7 on Boost
I thought ECO is offline if A/C and Defog were turned on

I remember when I first got me car ECO would not active due to A/C being on. This was in the summer and demand was great... Once I found the ECO to be working as it should.. I turn it off. Maybe a tune can turn ECO off for good. Try driving with ECO off if anything changes...
Old 01-29-2017, 03:13 AM
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Originally Posted by sunil517
I remember when I first got me car ECO would not active due to A/C being on. This was in the summer and demand was great... Once I found the ECO to be working as it should.. I turn it off. Maybe a tune can turn ECO off for good. Try driving with ECO off if anything changes...
My car is in the dealer so I can't try this , remember when in comfort mode the trans starts off in 2nd gear the computer might compensate this with rpm to move the car easier , try it in sport , sport plus , and in manual mode the rpms raise a little at idle , not sure what mode you where in when this happened, it's just another thought

I just checked the vid again you where in comfort I seen the 2 in the cluster

Last edited by 10speed; 01-29-2017 at 03:15 AM.

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