natvek

Ive got a problem with my 2 mth old C. Its never happened before, but just today when i got home and left it in Park, the engine decides to start revving, and it revs like how you would stomp on the pedal and let it go, stomp on it and let it go....as if it is getting ready to sprint off from start at a drag race.

Anyone had this problem?? and do you know why?? im going to bring it to the dealer but just wanted to know if anyone had this problem...

AkaSigFreak

Make sure your floor mat is not wedged against the gas pedal . Sounds stupid and might not be your solution but it happened to me once. Good luck

natvek

Thanks but nope, its not my floor mat, its fine in drive, but whenever i slip it into park, it goes into rev mode......

Savage c-300

its the beast inside your car and it wants to go fast! jk. you seriously need to take it to a dealer and have them replace some parts. This is the first i've heard of a car reving on its own in park.

racetested

I never understand why people with a new car and service issues ask for help when they have help from their warranties. Take the car to the dealer and let them figure out the problem while you cruise around in a rental and go about your day.

angeloxnet

not sure where ur located but if its really cold, engines tend to do that to try and warm up the engine faster

delirium

Because lots of dealers are full of BS & will try to do anything to get out of a repair. So loading up with ammo from this forum is a way to go to the dealer with an educated guess to provide support when they say they dont see the problem or that they can not reproduce the problem.

racetested

But do you really think something like this can be diagnosed over the internet especially when little information is known except "the car revs". I've been involved with cars for a long time and that tells me nothing except time to get the diagnostic tools out that I'm sure most people don't have.

I'm not a fan of dealers either but they aren't so bad as not wanting to fix anything.

aprince2die4

i noticed one day while walking bak to the car...which was still on....i could hear it idling from like two car rows away...at first didnt know wut the noise was till i got closer to my car...it sounded like someone in the car was revving it up but that was not the case...is this sorta wut you heard? if different is this a problem should i have it checked out....it doesnt do it all the time...note it was over 100 degrees that day....maybe cause the ac was on full...dont know but it was loud!!

delirium

Im not necessarily talking about us diagnosing the problem, but sharing experiences. Thats what forums are for right?

If someone else has had this problem before & found out how to fix it, that is good information to take to the dealer to say "I have heard that people with this problem have had it fixed by replacing the _______".

jrct9454

Sounds like the idle control circuit, which is a combination of software and injection hardware, is amiss. Not common, but not unheard of, either.

Off to the dealer for a good diagnosis.

methodz

you bought herbie's euro cousin

Krytech

Agreed.

Red_Demon08

It sounds like and airmass sensor..not sure but i had the same problem but with a different car..does it revv up 3k and goes down and repeats over and ..over again if so sounds like air mass sensor but i could be wrong..take it to da dealer..

natvek

Thanks a bunch guys for the replies. No offence to anyone but yeah i was hoping it was a known problem so i'd know i wont be jerked arnd by the dealers. Got it down to the dealers today so i hope i wont be stuck without it for toooooo long....

Krytech

Right on, make sure you let us know what they find out. Hope it's no big deal whatever it is.

RickP330

Hey Maybe you were in "race start" mode? LOL, sorry couldn't resist. Please let us know what you find.
RickP

natvek

Yeah i must have missed the "R" after the "S" mode... Anyways got my ride back today....spot one "Red Demon08".....it was the airmass sensor that was causing the revs.....got that switch out to a new one and it seems fine now....The guy at the dealers didnt really know how to explain the reason for the perculiar behavior but he said that it was the massair sensor that messed up the throttle....so as long as everythings fine, im happy now....

Krytech

Glad to hear it was something simple to diagnose and resolve! Thanks for the update.