[bigwise1]

my car has intermittent spots of rough idle so when i took it in for an oil change i had the dealer flash with the tsb(02/22/05 … 2005 .. #18-011-05 …. Flash - Engine Roughness or Idle Fluctuation)
i found listed on here for rough idle but it's still doing it. do any of you experience this?

 

[MrHappy]

I've noticed this as well. I'll have em add that to my list for 1st appointments and see if makes any difference with mine and check back.

 

[Northwest300C]

my car has intermittent spots of rough idle so when i took it in for an oil change i had the dealer flash with the tsb(02/22/05 … 2005 .. #18-011-05 …. Flash - Engine Roughness or Idle Fluctuation)
i found listed on here for rough idle but it's still doing it. do any of you experience this?

same here....dealer found no faults....

 

[LWOOD]

My car actually has developed this recently and stalled at an intersection the other day. It started right back up and has gone well ever since. I'll havw the dealer check it next time to see if the stall left a code.

 

[4herb2tas0tik]

mine to..iam thinking thats just the way the hemi idles

 

[bigwise1]

mine to..iam thinking thats just the way the hemi idles

yeah, i was thinking that. i've never sat in another 300C so i have nothing to compare it to.

 

[bellster300c]

My 300C has the same problem. Three times now, the hemi has quit while either stopped or barely moving. The dealer has flashed tsb 18-011-05, but I still have an occasional rough idle. My RPM's set about 700, but every once in a while they will drop to 500, the engine starting running very rough and it I do not give it some gas, then it dies.

Not often and never repeatable. Dealer says nothing is wrong and no error codes are generated.

Any more thoughts on this?

Cheers

 

[HEMMISSEY]

wassup with all the TSB's... lol

When i had my PCM re-flashed, I also told them about the rough idle problem as well, they told me that it was normal for all the HEMI motors.. They even started a new car up for me and let me hear it idle, sat in it too, and you know what.. same shi*! I dunno.. :hit's head on desk:

 

[CJ7VFR]

Mine does it too. Kind of a lope to the idle like older cars with big cams or
something.

I just figured it was the way the Hemi idled too. I kind of like it! It makes
people who sit in my car ask about the engine. I tell them thats how a car
with alot of power is supposed to idle, and they all nod their heads and say
"cool".

Jim

 

[HaTaX]

Yeah, Big V8s with hot cams do have a lope in their idle because the cams are so "lumpy" (Large distances between valves closed and open) that they cause the car to idle rough at lower RPMs... An easy electronic way to fix it with a car this modern would be to up the idle RPMs by a hundred or so RPMs.....

Never bothered me, after the car is warmed up and in drive, it doesn't shake for me.. But while in park... You would swear that it's idling in 4cyl mode vs V8....

 

[dynodon]

HaTaX,

The 300C hardly has a big cam, or lumpy idle. Mine too has the occasional shudder or shake, and then for a few seconds it is super smooth. This is NOT the symptom of a hot cam, if that was the case it would idle that way all the time.

This is a symptom of the engine control (ignition) or maybe emissions system. I am not happy about it. But I am learning to live with it. The V8 in my 1996 SHO idles perfectly smooth at 110,000 miles (and has since new) and it has about as hot a cam as most modern V8's, and pulls well to 6500 or so rpm.

Anyone know exactly what the TSB about idle quality really says? (18-011-05). Is there someplace to read the entire TSB?

 

[CJ7VFR]

This is NOT the symptom of a hot cam, if that was the case it would idle that way all the time.

We aren't saying its a hot cam. We were just comparing the sensation with a car
that might have a hot cam in it just so people can relate the feeling to something
they might have seen, heard or felt before.

Its just a comparison, and no one actually said it was a cam problem.

Jim

 

[dynodon]

Jim,

I didn't say it was a "cam" problem either, but the sensation was equated with a typical hot or race cam in other words, and I just pointed out that it would do it all the time if that was the case.

If I didn't get the previous meaning exactly, then chalk it up to forum "communication".

And yes, if it was too big of a cam, then upping the idle as was mentioned would help, but I sure don't want a new car with a 1000 rpm idle!

I put new cams in my '89 SHO race car and now THAT is a hot cam idle. If a V6 can have attitude, then this car has it. And pulls strong beyond 7500 rpm. And it will have to have an idle speed close to 1000 rpm.

The idle stutter in the 300C Hemi seems to be ignition or fuel related though.

I used to own a Chassis dyno shop (was called "Dyno" Don long before that though) and when looking at a dyno chart, the smoother the chart, the better the ignition/combustion control. The best cars for this type of control? Ford. The EEC computer ignition system by far does the best job of controlling full throttle combustion. BMW, Mercedes, GM, Mopar all showed the typical spikes and valleys of inconsistent power application (combustion). It is hard to feel in the seat of the pants, but the dyno sees all, or most of all!

Still wonder if there is someplace where we can read the content of the TSB's without subscribing to something. I would like to learn more about what DC says is causing the erratic idle. It is unseemly in a modern car.

 

[CJ7VFR]

The idle stutter in the 300C Hemi seems to be ignition or fuel related though.

This is my personal thought too. I think it might have something to do with the MDS
system being in place, and the fact that its electronically controlled along with the
fuel injectors.

Jim

 

[MrHappy]

For what it's worth, I had several software updates applied to my car (just picked it up today) and thus far, it seems to idle a bit smoother. Now, it's only been maybe an hour's worth of driving, but I'll keep anyone updated if they are interested.

 

[dynodon]

Thanks for the update MrHappy, let us know how it goes after more miles.

 

[HaTaX]

Alright.... Took to the dealer today and got it's 9K oil change, a new sunroof install as pertaining to rattles and also asked them about the rough idle...

Drove the car home after work and it has had TSB 18-31-04 performed on it and it seemed to be running great on the drive home...

Got it home and washed it and took it out to take some pictures of it and when I took it out it seemed to mis-shift into 3rd gear, and then do the same again within 30 seconds..... When I pulled into the lot to take pictures the check engine light came on and the car drifted.... Engine had shut off..... So I restarted it and it hasn't acted up since......

I will call them tomorrow and inform them of this and see what I can get done.

 

[SilverHemi]

Mine too

I've owned mine for about a year and several times it has idled rough and or stalled. Never had it checked, seemed to get better as time went on. Most likely to happen when turning, low idle combined with PS pump = stall.

Silverhemi

 

[Darrenph1]

I felt this too and I'm in a V6!

 

[Tasha]

Same here, had mine in for rough idle and they said all was fine...well it is not.