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Old 11-15-2009, 10:45 PM
4FishLimit 4FishLimit is offline
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Surging at idle in gear

I was wondering if any other '09 R/T owners have noticed this or not (or even other years for that matter). Sometimes while stopped at idle, the RPMs will surge and the car moves forward slightly, like you're pressing on the throttle and brake at the same time.

The car doesn't really move forward, but it is annoying when pulling into a parking stall or when stopped at a red light. I checked the list of TSB's out for '09 and haven't seen anything related to this yet.
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  #2  
Old 11-15-2009, 11:42 PM
Griff Griff is offline
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Yeah, I've noticed this happening with my '09 R/T as well. It doesn't happen very often, and it seems to be totally random, but it's kind of unsettling. Makes you feel like you need to step on the brake pedal harder to keep the car from moving forward. Almost like you're trying to do a brakestand.
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Old 11-16-2009, 12:30 AM
goincd3 goincd3 is offline
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I have an 09 RT and haven't noticed anything...if I do I'll be sure to post here.
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  #4  
Old 11-16-2009, 05:12 AM
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370 HEMI 370 HEMI is offline
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Quote:
Originally Posted by 4FishLimit View Post
I was wondering if any other '09 R/T owners have noticed this or not (or even other years for that matter). Sometimes while stopped at idle, the RPMs will surge and the car moves forward slightly, like you're pressing on the throttle and brake at the same time.

The car doesn't really move forward, but it is annoying when pulling into a parking stall or when stopped at a red light. I checked the list of TSB's out for '09 and haven't seen anything related to this yet.
This is simply an educated guess, but the 09s and up use Deceleration Fuel Cutoff. It is basically where the engine has deceleration fuel shut off and camshaft controlled charge trapping. It is designed to save fuel and also reduce NOx during deceleration and idle. It can only be used in an engine that has variable valve timing and electronic throttle control.

This is the case with the 09 and later Chargers.

It could at least be a clue here.

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Old 11-16-2009, 10:49 PM
4FishLimit 4FishLimit is offline
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Quote:
Originally Posted by 370 HEMI View Post
This is simply an educated guess, but the 09s and up use Deceleration Fuel Cutoff. It is basically where the engine has deceleration fuel shut off and camshaft controlled charge trapping. It is designed to save fuel and also reduce NOx during deceleration and idle. It can only be used in an engine that has variable valve timing and electronic throttle control.

This is the case with the 09 and later Chargers.

It could at least be a clue here.

Regards,
Brian
BND Automotive LLC
440-821-9040
That's a good place to start, but the only problem is that this happens at random, well after any deceleration has occured. I'd hope that this isn't just the nature of having such a feature, as it is quite noticeable and a little annoying.

I may drop it by the dealer if I get some spare time in the coming weeks. Otherwise I'll just keep checking out the list of TSB's for the LX's.
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Old 11-16-2009, 10:50 PM
4FishLimit 4FishLimit is offline
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Originally Posted by Griff View Post
Yeah, I've noticed this happening with my '09 R/T as well. It doesn't happen very often, and it seems to be totally random, but it's kind of unsettling. Makes you feel like you need to step on the brake pedal harder to keep the car from moving forward. Almost like you're trying to do a brakestand.
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Originally Posted by goincd3 View Post
I have an 09 RT and haven't noticed anything...if I do I'll be sure to post here.
Just a thought, what are the production dates for your vehicles?

Ours was manufactured in October 2008.
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  #7  
Old 11-16-2009, 11:01 PM
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i've got an 07 R/T n she does the same thing, from time to time...still catches me off guard,find myself pressin harder on the brake..lol thinkin i let off n im rollin into traffic...

Last edited by alberni_charger_R/T; 11-16-2009 at 11:03 PM.
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Old 11-16-2009, 11:08 PM
Griff Griff is offline
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Mine is a mid-Feb. '09 build date.
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Old 11-17-2009, 07:50 AM
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Are you running the A/C (even in auto)? Each time the compressor turns on I notice the idle jump up slightly. If my foot's not securely on the brake it can make the car roll forward.
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Old 11-17-2009, 08:01 AM
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Originally Posted by mnunes View Post
Are you running the A/C (even in auto)? Each time the compressor turns on I notice the idle jump up slightly. If my foot's not securely on the brake it can make the car roll forward.
I noticed it also. I have my idle turned down to 600rpm and i thought it was when the fans kicked on/off or the blower motor for the HVAC system was turning on for auto mode control. Of course I also think part of mine is my cam too.
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