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Unread 05-18-2014, 03:18 PM   #1
Feraldo
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2014 WK 
 
Join Date: Aug 2013
Location: Argentina
Posts: 11
Hard and short noise after start the engine

Hello everyone...
I do not write so much because my english is very poor, but now I am very concerned about a hard noise and maybe you could tell me what is happening... I am really worried.
I have a Grand Cherokee Limited V6 Pentastar 8 speed, year 2014, with 9.000 mi (15.000Km).
The last days, when I started the engine in the morning, AFTER ONE or TWO seconds, it make a hard and short noise like a clunk, and the vehicle makes a short push forwards, like a jerk forwards... Some days this effect is smooth, but sometimes this noise is very hard and freeze my blood...
This only happen in the morning, after the engine was stopped all night.
Thanks in advance for your comments...

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Unread 05-18-2014, 04:46 PM   #2
Gunny7
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2014 WK 
 
Join Date: Nov 2013
Location: Houston, Tx
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If you start it and never move the Transmission Selector and the vehicle moves, seems to me, to be in the Computer. Or a solenoid controlling the transmission.

Dealer needs to fix.
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Unread 05-18-2014, 08:10 PM   #3
Feraldo
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Quote:
Originally Posted by Gunny7 View Post
If you start it and never move the Transmission Selector and the vehicle moves, seems to me, to be in the Computer. Or a solenoid controlling the transmission.

Dealer needs to fix.
No, I never move the transmission selector. I start it in Park (P), and two seconds later, bang, makes the clunk noise and a jerk forwards...
Thank you!
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Unread 05-19-2014, 05:30 AM   #4
97HMCS
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http://www.jeepforum.com/forum/f309/...start-1332640/
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Unread 05-19-2014, 06:59 AM   #5
canistel
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2012 WK 
 
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Location: Hamilton, Ontario
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Do you use the parking brake? What happens when you set the parking break (correctly) before turning the jeep off, then starting it the next time, does the jerk still occur?
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Unread 05-19-2014, 07:07 AM   #6
redddog
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Wow. Now that's crazy.
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Unread 05-19-2014, 12:09 PM   #7
Feraldo
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Join Date: Aug 2013
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Quote:
Originally Posted by 97HMCS View Post
Mmmm... normal?
Mine makes a very hard noise, like a strong knock... I think that cannot be normal...

Thank you very much for your answer!
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Unread 05-19-2014, 12:24 PM   #8
97HMCS
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Quote:
Originally Posted by Feraldo View Post
Mmmm... normal?
Mine makes a very hard noise, like a strong knock... I think that cannot be normal...

Thank you very much for your answer!
A strong knock doesn't sound normal to me.
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Unread 05-19-2014, 06:48 PM   #9
Gunny7
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Reason I said Solenoid, is the transmission is shifted by the computer. There has to be a signal from the
Computer to the Transmission, telling it what to do. Somewhere, somehow.
Without having any other idea about this I would, at least, have this checked out.
Could be just a bad wire or connection.
Solenoid is a electric switch or activator.
Modern autos are full of these kind of things.
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Unread 05-19-2014, 08:18 PM   #10
13ovsummit
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Quote:
Originally Posted by Feraldo View Post
Mmmm... normal?
Mine makes a very hard noise, like a strong knock... I think that cannot be normal...
I don't think it sounds normal to me, and I have not read about a problem like this before. If I were you, I would take it to your dealer and demonstrate the problem to them. I assume you have a warranty on your jeep. Have the dealer fix it if they can.
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Unread 05-24-2014, 08:24 PM   #11
Feraldo
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Sorry, duplicated...
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Unread 05-24-2014, 08:32 PM   #12
Feraldo
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Join Date: Aug 2013
Location: Argentina
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Belive it or not... Last days I engage the reverse (R) for 3 or 4 seconds before stop the engine... No more clunks at start the engine. Why? I dont know... I will remain testing this to see what happen...
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