new hemi hesitation?
#1197246
03/14/12 11:27 PM
03/14/12 11:27 PM
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Joined: Oct 2003
Posts: 4,006
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,006
South Park, Pa.
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My new truck has a 5.7 Hemi. Great truck with only 2700 miles on it. The only issue I have is an off idle flat spot or hesitation. It's very noticable when leaving from a dead stop and "nailing it". The engine will just sit there for what seems like a full second or two then take off. Is this normal, or is there some "fix" for it?
Thanks for any help.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: new hemi hesitation?
[Re: 72swgnr]
#1197248
03/15/12 01:28 AM
03/15/12 01:28 AM
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Joined: Jan 2007
Posts: 10,124
A Red State
SNK-EYZ
I Live Here
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I Live Here
Joined: Jan 2007
Posts: 10,124
A Red State
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I can't say if it applies to your truck (you didn't post the year) but it may help. From www.chargerforums.com http://www.chargerforums.com/forums/showthread.php?t=8118 2006 Dodge Charger Reset & Calibration Procedures Throttle Calibration Throttle calibration can substantially improve throttle responsiveness over "factory standard." Many people notice what appears to be sluggish throttle response or a "dead area" at initial accelerator depression. Throttle calibration can take care of these. 1) Insert ignition key and turn to "ON" (not start). 2) Wait for all idiot lights to go out. Check Engine Light may remain on. 3) Slowly depress the accelerator pedal all the way to the floor. 4) Slowly release the accelerator pedal until it's all the way back up. 5) Turn the ignition key to "OFF". 6) Start the engine. Most drivers notice an immediate change in throttle response, but depending on your driving style, you may need to repeat this procedure periodically due to the computer's adaptive programming. You likely need to repeat this procedure any time the battery is disconnected.
Kayse can't keep up at all now. lol
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Re: new hemi hesitation?
[Re: 68LAR]
#1197250
03/15/12 11:40 AM
03/15/12 11:40 AM
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Joined: Jan 2003
Posts: 17,836
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,836
S.E. Michigan
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Quote:
1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.
7) Congradulations, you have successfully reset your
oil change reminder light
I'm sorry to be an internet mythbuster but there is no such thing as a do-it-yourself throttle calibration.
There is however such a thing as "throttle relearn", but it's only needed when the throttle body is swapped out and it requires dealership quality scan tools to perform. But it also has no effect at all on throttle response.
Here is how to reduce electronic throttle lag:
With no money invested-
1.Battery disconnect. 30-60 minutes is good, if you have the time.
2.Reconnect the battery, fire it up and drive it like an absolute maniac. Give it all the WOT you possibly can, as long as you possibly can.
(A dragstrip is probably best for obvious safety reasons)
Not only will the throttle response improve, but the trans shift quality will improve. This is due to the adaptive memory in modern vehicle pcms; If you drive it very easy for very long, the vehicle will learn your driving habits....the throttle will act slow and the trans will shift like oatmeal. If you drive like a maniac long enough, throttle response 'wakes up', the trans shifts harder, and it will feel better to a performance driver.
But, the effect is temporary. Drive it really slow and easy for 3 trips of 50 miles or more, adaptive memory will take over and it will go back to the way it was.
For a more long lasting improvement, put a 77070023 cold air intake on it. Throttle response gets better in all kinds of driving, and I have seen a 25HP gain at the rear wheels with just that one part change, above 5000rpm. I know alot of people say cold air intakes don't work, but that particular one is actually good.
Rich H.
Esse Quam Videri
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197251
03/15/12 12:24 PM
03/15/12 12:24 PM
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Joined: Aug 2010
Posts: 632
Casco, MI
Savoy1964
mopar
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mopar
Joined: Aug 2010
Posts: 632
Casco, MI
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I cured my hesitation on the challenger by upgrading the Throttle Body to the next bigger and cnc'ed one. After 10 minute install ran much better.
2003 Dodge 3500 Diesel
1964 Plymouth Savoy White 2dr sdn. 512 stroked, Dominator, New Best 9.75 @ 138.50mph
2019 Challenger Scat Pack 1320 White Knuckle-K&N Cold air filter, Billit Oil catch can, drag radials stock 11.911 @ 114mph
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197254
03/15/12 01:59 PM
03/15/12 01:59 PM
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Joined: Oct 2003
Posts: 4,006
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,006
South Park, Pa.
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Quote:
Quote:
--------------------------------------------------------------------------------
1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.
--------------------------------------------------------------------------------
7) Congradulations, you have successfully reset your
oil change reminder light
Thanks, that's too funny. 
If the computer is "self learning", wouldn't the same thing happen in reverse? I mean, instead of driving it normally, start beating on it. Should the throttle response and shifting improve???
I'm just asking, I'm too old to understand this new technology.
Thanks for the help. 
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: new hemi hesitation?
[Re: 68LAR]
#1197255
03/15/12 03:23 PM
03/15/12 03:23 PM
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Joined: Jan 2003
Posts: 17,836
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,836
S.E. Michigan
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Quote:
Thanks, that's too funny.
If the computer is "self learning", wouldn't the same thing happen in reverse? I mean, instead of driving it normally, start beating on it. Should the throttle response and shifting improve???
I'm just asking, I'm too old to understand this new technology.
Thanks for the help.
Glad you saw the humor in that 
Yes, if you just beat on it more while driving it, it should come around a certain amount...but it does take a little while for the pcm to learn your driving habits have suddenly changed.
I mentioned battery disconnect because that's the easiest way to clear some of the adaptive memory, and the results are much more immediate.
Rich H.
Esse Quam Videri
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Re: new hemi hesitation?
[Re: Jeff_383]
#1197257
03/15/12 07:48 PM
03/15/12 07:48 PM
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Joined: Jul 2006
Posts: 382
Roseville MN
72swgnr
enthusiast
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enthusiast
Joined: Jul 2006
Posts: 382
Roseville MN
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Quote:
Can you just get it tuned out like on GM vehicles?
Chrysler decided to use top secret computers on the 2011 and up vehicles. So far no one has been able to crack the codes in the aftermarket industry.  
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Re: new hemi hesitation?
[Re: 72swgnr]
#1197258
03/15/12 08:50 PM
03/15/12 08:50 PM
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Joined: Jul 2009
Posts: 33
Calgary, Alberta
Turbo392
member
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member
Joined: Jul 2009
Posts: 33
Calgary, Alberta
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I can punch it to the floor and release quickly without the throttle even cracking open, but with a scanner showing the pedal sensor working. It's a Dodge thing.
2003 Dodge Ram 1500
Turbo / Meth Injected 6.4L Hemi (392)
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197259
03/17/12 06:20 PM
03/17/12 06:20 PM
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Joined: Jan 2003
Posts: 403
southern Maryland
keefe
mopar
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mopar
Joined: Jan 2003
Posts: 403
southern Maryland
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For a more long lasting improvement, put a 77070023 cold air intake on it. Throttle response gets better in all kinds of driving, and I have seen a 25HP gain at the rear wheels with just that one part change, above 5000rpm. I know alot of people say cold air intakes don't work, but that particular one is actually good.
Zippy.. Does the 77070023 cold air intake work on a 2005 hemi ram also ? 
1971 duster twister 440, 3380#,509 M/P hyd,906's,full Exhaust,11.06@117.46 1/4,6.95@ 97.03 1/8,1.497 60ft.....
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Re: new hemi hesitation?
[Re: keefe]
#1197260
03/17/12 09:56 PM
03/17/12 09:56 PM
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Joined: Jan 2003
Posts: 17,836
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,836
S.E. Michigan
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Unfortunately no, that part number will only fit 2009 to '12. For 2003-2005 the engine and body/underhood sheetmetal are different, so there is a different cold air intake for that truck....it is 77060005AB. It does help the throttle response noticeably, but it does not have the HP gain the later model cai has. If I remember the old tests correctly it picked up about 12hp. However!! an '03-'08 has an option available that the newer truck does not have: an SRT-10 hood swap, an open hood scoop, and an air duct that attaches underneath the scoop to route the air to the cai box. I tried all that stuff on my 2003, and even with over 200,000 miles on the truck it did make a noticeable difference. Plus I think it looks cool LMK if that is of any interest, I'll round up all the PNs for ya if you need them.
Rich H.
Esse Quam Videri
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197261
03/17/12 09:57 PM
03/17/12 09:57 PM
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Joined: Jan 2003
Posts: 17,836
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,836
S.E. Michigan
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airbox/air duct/whatever the heck it is called
Rich H.
Esse Quam Videri
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197262
03/17/12 09:59 PM
03/17/12 09:59 PM
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Joined: Jan 2003
Posts: 17,836
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,836
S.E. Michigan
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The scoop (with a fancy insert, found it on ebay, the stocker is black plastic)
Rich H.
Esse Quam Videri
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Re: new hemi hesitation?
[Re: ZIPPY]
#1197263
03/19/12 08:08 PM
03/19/12 08:08 PM
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Joined: Jan 2003
Posts: 403
southern Maryland
keefe
mopar
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mopar
Joined: Jan 2003
Posts: 403
southern Maryland
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Thanks Zippy, That looks great on your truck. My truck is a 05 daytona so I think the hood is the same. When you get chance can you Pm me the part numbers, no rush this is a down the road project for me.. lol
Thanks Keefe
1971 duster twister 440, 3380#,509 M/P hyd,906's,full Exhaust,11.06@117.46 1/4,6.95@ 97.03 1/8,1.497 60ft.....
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Re: new hemi hesitation?
[Re: 68LAR]
#1197264
03/21/12 03:17 PM
03/21/12 03:17 PM
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Joined: Sep 2006
Posts: 411
Portersville, Pa
1badx
mopar
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mopar
Joined: Sep 2006
Posts: 411
Portersville, Pa
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Quote:
My new truck has a 5.7 Hemi. Great truck with only 2700 miles on it. The only issue I have is an off idle flat spot or hesitation. It's very noticable when leaving from a dead stop and "nailing it". The engine will just sit there for what seems like a full second or two then take off. Is this normal, or is there some "fix" for it?
Thanks for any help.
What year is the truck? You mention new and I'm assuming 2011 or newer but..... if it's a 2010 or older email me.
With the purchase of a tuner (Predator or Trinity) we can take care of that hesitation and get you some better mileage 
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Re: new hemi hesitation?
[Re: 1badx]
#1197265
03/22/12 12:29 PM
03/22/12 12:29 PM
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Joined: Oct 2003
Posts: 4,006
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,006
South Park, Pa.
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As I stated in my second response, it's a 2011. From all the info I have gathered, there doesn't seem to be a cure for the 2011 hesitation just yet.
It is supposed to be a self teaching computer. Any adjustment made to the computer will be short lived, supposedly..... I don't race the truck, so it's not that big a deal at this time. If I "lay" into the gas, it flat a.. hauls.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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