is a clunking noise normal on acceleration
Thread Starter
JK Junkie
Joined: Feb 2011
Posts: 2,318
Likes: 12
From: New Hampshire
, once your under load on straitaway like highway or long stretches dosent seem apparent , but when driving in low speeds like in first and second when your almost at a roll
Last edited by jeepmojo; Aug 28, 2011 at 01:20 PM.
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
after you shift ? when you let off accelerator lets say and then go to give it a little gas there seems to be a clunk in what id assume to be transfercase at low speeds, my jeep only has 2,500 miles on it and its done it since i got it , its a 2011 sport
6 speed 3.21 gearing , once your under load on straitaway like highway or long stretches dosent seem apparent , but when driving in low speeds like in first and second when your almost at a roll ! i can actually make it keep clunking just tapping the accelerator pedal and quickly letting off the pedal as well , seems like play inthe gearbox of some type ! maybe all jeeps do this ! im not sure its not u joints but all most feels like the play yould get when one is going on your drive shaft ! yet my jeep hasnt seen a dirt road yet ! i notice it when my clutch is in lets say when your coasting on a steep incline then when you let out clutch and go to accelerate again theres a meshing clunk before it actually starts to pull
any others have this ???? thanks in advance
6 speed 3.21 gearing , once your under load on straitaway like highway or long stretches dosent seem apparent , but when driving in low speeds like in first and second when your almost at a roll ! i can actually make it keep clunking just tapping the accelerator pedal and quickly letting off the pedal as well , seems like play inthe gearbox of some type ! maybe all jeeps do this ! im not sure its not u joints but all most feels like the play yould get when one is going on your drive shaft ! yet my jeep hasnt seen a dirt road yet ! i notice it when my clutch is in lets say when your coasting on a steep incline then when you let out clutch and go to accelerate again theres a meshing clunk before it actually starts to pull
any others have this ???? thanks in advance
Doctor: So, don't do that.
I have found that to happen on just about all of the sticks I have driven, when the throttle is pushed, and let go.
If it happens when you shift, you may not be coordinating the clutch and throttle quite well enough.
All drive trains have some backlash.
Try it in 4lo. It will be even more apparent.
Last edited by ronjenx; Jun 10, 2011 at 08:40 PM.
JK Freak
Joined: Jul 2009
Posts: 590
Likes: 1
From: State College, PA
Mine has been doing it since day one, perfectly normal. Also I have the same set-up (3.21 gears and a 6-speed). I currently have over 20,000 miles, no problems at all to date (knock on wood). 
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
Well, the guy who said "no clunks here" is probably not doing what you described with the throttle pedal.
Regarding the clunk while shifting, you can eliminate that with a little different clutch pedal/gas pedal coordination.
Regarding the clunk while shifting, you can eliminate that with a little different clutch pedal/gas pedal coordination.
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
when backing up in reverse it went into a complete stutter ( and was stalling)
shaking im like wtf, i thought maybe the button that has somthing to do with extra slip traction does that it was on but i turned it off and then light came on saying off on dash ! im thinkin nooo maybe i better leave it on lol, either way it stalled out ( first time for that kinda felt scary ) that shake felt strong enough to rattle motor mounts almost , good thing it stalled ! yet im thinkin are these new jeeps worth the cash shelled out ! this thing is brand new and i have bunches of things happening i dont actually care for ! i love to look and the interior but it certainly has its cons too !
shaking im like wtf, i thought maybe the button that has somthing to do with extra slip traction does that it was on but i turned it off and then light came on saying off on dash ! im thinkin nooo maybe i better leave it on lol, either way it stalled out ( first time for that kinda felt scary ) that shake felt strong enough to rattle motor mounts almost , good thing it stalled ! yet im thinkin are these new jeeps worth the cash shelled out ! this thing is brand new and i have bunches of things happening i dont actually care for ! i love to look and the interior but it certainly has its cons too !
Were you backing up on an incline? Maybe the Hill Start Assist was kicking in. It can cause a stall if you are not used to it.
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
Yes, the Miata would be a lot more smooth on the shift. The ratios are closer, and the throw is a lot shorter. Even with that, though, I bet you could make it clunk by pushing and letting up on the gas pedal in the lower gears.
The HSA can be shut off.
HSA Off
If you wish to turn off the HSA system, follow this
procedure:
1. Start with the engine off and vehicle in PARK (automatic
transmission) or NEUTRAL with clutch out
(manual transmission) with wheels straight. Apply parking
brake on manual transmission vehicle.
2. Start the engine.
3. With the engine running, the brake applied, and the
clutch out, rotate the steering wheel 180° counterclockwise
from center.
4. Press the ESC OFF switch four times within twenty
seconds.
5. Rotate the steering wheel 360° clockwise (180° clockwise
from center).
6. Cycle ignition switch OFF then ON.
7. If the sequence was completed properly, the “ESC
Activation/Malfunction Indicator Light” will blink several
times to confirm HSA is off.
Steps 1-7 must be completed within 90 seconds to turn off
HSA. Repeat steps 1-7 to re-enable HSA functionality.
The HSA can be shut off.
HSA Off
If you wish to turn off the HSA system, follow this
procedure:
1. Start with the engine off and vehicle in PARK (automatic
transmission) or NEUTRAL with clutch out
(manual transmission) with wheels straight. Apply parking
brake on manual transmission vehicle.
2. Start the engine.
3. With the engine running, the brake applied, and the
clutch out, rotate the steering wheel 180° counterclockwise
from center.
4. Press the ESC OFF switch four times within twenty
seconds.
5. Rotate the steering wheel 360° clockwise (180° clockwise
from center).
6. Cycle ignition switch OFF then ON.
7. If the sequence was completed properly, the “ESC
Activation/Malfunction Indicator Light” will blink several
times to confirm HSA is off.
Steps 1-7 must be completed within 90 seconds to turn off
HSA. Repeat steps 1-7 to re-enable HSA functionality.
Last edited by ronjenx; Jun 10, 2011 at 09:14 PM.
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JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
your right i think u can do it with most ! infact i usually try this method if i think a ujoint is going on my truck kinda hit the pedal and let of and hit it again
but with my jeep it just kinda does it naturally but has a clunky clunk noise
before it actually starts to pull under load , if that makes sence ?
but with my jeep it just kinda does it naturally but has a clunky clunk noise
before it actually starts to pull under load , if that makes sence ?
JK Newbie
Joined: May 2011
Posts: 7
Likes: 0
From: cold lake
have the same problem
this is the actual service invoice
request/complaint/corrections:
1- ME- customer concern engine overheating,Fan not Cutting in
1-service dept.- COOLING NO TROUBLE FOUND DIAGNOSTIC
CAUSE: TRIED TO VERIFY CUSTOMER COMPLAINT. RAN VEHICLE LONG ENOUGH FOR FAN TO CUT IN. TEMP GAUGE WAS 1/2 WHEN FAN TURNED ON. NO FAULT FOUND
2- ME-customer concern when gearing up from 1st to second getting clunk
2-service dept.- TRANSMISSION NTF NO TROUBLE FOUND DIAGNOSTIC LOP- NO REPAIR/TROUBLE NOT FOUND NO REPAIR/ TNF UNUSUAL TRANS/DRIVELINE NOISE(B)
CAUSE:VERIFY CUSTOMER COMPLAINT BY TEST DRIVING. HEARD NOISE WHEN UP SHIFTING . TYPICAL STANDARD TRANS GEAR CLASH WORKING AS DESIGNED FC YN NOISY
request/complaint/corrections:
1- ME- customer concern engine overheating,Fan not Cutting in
1-service dept.- COOLING NO TROUBLE FOUND DIAGNOSTIC
CAUSE: TRIED TO VERIFY CUSTOMER COMPLAINT. RAN VEHICLE LONG ENOUGH FOR FAN TO CUT IN. TEMP GAUGE WAS 1/2 WHEN FAN TURNED ON. NO FAULT FOUND
2- ME-customer concern when gearing up from 1st to second getting clunk
2-service dept.- TRANSMISSION NTF NO TROUBLE FOUND DIAGNOSTIC LOP- NO REPAIR/TROUBLE NOT FOUND NO REPAIR/ TNF UNUSUAL TRANS/DRIVELINE NOISE(B)
CAUSE:VERIFY CUSTOMER COMPLAINT BY TEST DRIVING. HEARD NOISE WHEN UP SHIFTING . TYPICAL STANDARD TRANS GEAR CLASH WORKING AS DESIGNED FC YN NOISY
Last edited by gimmer; Jun 11, 2011 at 10:05 AM.