High Revving Hemi...Help Required - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 20 (permalink) Old 09-10-2008, 04:36 AM Thread Starter
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High Revving Hemi...Help Required

Hi All,

Iíve had my 5.7 Hemi for a couple of months now with a total of 4,000 miles on the clock. However, when I turn the key to start her up (either cold, warm or Hot), the revís run high at about 1,500rpm and when I move from park to drive or reverse the revs drop to normal and I hear the sound of binding and popping from the transmission as she moves into the desired selection. This happens evey time I start her up!!!

Is this normal as my dealer says it isÖ.but I donít think soÖ.

SoÖwhat does the font of knowledge say???

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post #2 of 20 (permalink) Old 09-10-2008, 06:05 AM
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I have the same problem but only when I put in reverse and its been there since new.

The dealer said the same thing as yours, its normal. but I'm still not convinced !!! it doesn't look normal at all !!

I will change the transmission and transfer case oils today and see if that will make any change and I will check the old oil if it has alot of metal wear.


UKCommander, that should be good news for you as its not only you having such problem, not like the other CDR transmission which you replaced three times !!

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Last edited by Ahmed; 09-10-2008 at 06:08 AM.
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post #3 of 20 (permalink) Old 09-10-2008, 07:13 AM
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UK and Ahmed,
Based on your description I also would consider this normal.
On a cold start or warm restart the computer is in open loop mode.
This means, it is in base[ fixed ] program. It will not go into closed loop [ecm control] untill a series of parameters are met.
The ecm is looking for, Coolant temperature. There is a pre-determined temp before ecm control can occur.
It is also looking for O2 sensor info so it can determine if exaust temp requirement has been met.
The ecm has turned on a electric air pump to speed up EGT [O2] warmup.
It has RAISED the idle speed to achieve the previous parameters as rapidly as possible.
If you put the vehicle in gear at startup with no warm time, the ecm will start to drop the idle speed to reduce the engagement shock, but it cant do it fast enouph.
The momemtum of the rotating parts conspires against rapid rpm drop, so, you create shift shock[ clunk ], Which is the rapid takeup of every components free play in the entire driveline.
Moral of the story, Wait till rpm drops to about 1000 rpm before putting in gear.
It only takes 30 to 90 seconds.
I usually put my belt on after I start it to let idle start to slow down.
To prove my point, right foot on gas/ hold 1500 rpm.
Left foot firmly on brake [no park brake] put it in gear. You will reproduce the driveline shock every time.
There is nothing wrong with the vehicle if my interpetation of the question is correct.

............Rob


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post #4 of 20 (permalink) Old 09-10-2008, 07:20 AM
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Thanks robby, its not really a shock in the drive line, but rather ringing sound or as UKcommander said popping sound, I will try to record the sound and post here to hear it.

I know the shock is normal due to the high RPM, but that sound is different!

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post #5 of 20 (permalink) Old 09-10-2008, 07:33 AM
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Ahmed,
That sound is likely the audible ping that resonates through a hollow driveshaft on high rpm engagement shock.
I am fairly confident I've done it to myself when in a hurry.
Then I visualize all those components going, SMACK!
So, I don't rush it anymore.
.....Rob


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post #6 of 20 (permalink) Old 09-10-2008, 07:45 AM
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I don't think my idle ever is that high....
I don't remember this happening in mine. EVER. Even last winter with sub-zero temps.

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post #7 of 20 (permalink) Old 09-10-2008, 09:53 AM
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my 4.7 does the same thing. if you wait 30 seconds it will drop the rev's and then it won't slam the transmission.

i think its normal.

Quote:
Originally Posted by UK Commander View Post
Hi All,

Iíve had my 5.7 Hemi for a couple of months now with a total of 4,000 miles on the clock. However, when I turn the key to start her up (either cold, warm or Hot), the revís run high at about 1,500rpm and when I move from park to drive or reverse the revs drop to normal and I hear the sound of binding and popping from the transmission as she moves into the desired selection. This happens evey time I start her up!!!

Is this normal as my dealer says it isÖ.but I donít think soÖ.

SoÖwhat does the font of knowledge say???
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post #8 of 20 (permalink) Old 09-10-2008, 12:43 PM
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Join Date: Dec 2007
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I managed to record the sound, its in the attachment.

the sound occurs seconds after engine starts.

I used to neglect this as the dealer said its normal, I hope I didn't break something after 8 months and 20k miles.
Attached Files
File Type: zip Transmission sound.zip (44.2 KB, 59 views)

Second Jeep Commander, Current
2007 XH (International model), Green Metallic, Ltd, 5.7L HEMI, Quadra-Drive II
Spidertax 1.5" wheel spacer, K&N replacement filter
OME 2" Lift kit


First Jeep Commander,
2007 XH (International model), Light Graystone Pearl, Sport , 4.7L Quadra-Trac II.





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Last edited by Ahmed; 09-10-2008 at 12:48 PM.
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post #9 of 20 (permalink) Old 09-10-2008, 01:20 PM
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Mine does not do it.

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post #10 of 20 (permalink) Old 09-10-2008, 05:17 PM
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Join Date: Dec 2007
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UKCommander, is it the same you hear in yours?

Second Jeep Commander, Current
2007 XH (International model), Green Metallic, Ltd, 5.7L HEMI, Quadra-Drive II
Spidertax 1.5" wheel spacer, K&N replacement filter
OME 2" Lift kit


First Jeep Commander,
2007 XH (International model), Light Graystone Pearl, Sport , 4.7L Quadra-Trac II.





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Last edited by Ahmed; 09-11-2008 at 02:21 PM.
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