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My jeep at a high speed jerks. 03 it only has done it 3

Customer Question
My jeep at a...

My jeep at a high speed jerks

Mechanic's Assistant: What is the model/year of your Jeep?

03 it only has done it 3 times and it's at about 75

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

4.0

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Nothing yet and yes

Submitted: 8 months ago.Category: Jeep
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Customer reply replied 8 months ago
Jeep has 188, miles well maintained vehicle
Answered in 15 minutes by:
11/19/2017
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago
David Craig
David Craig, Auto Mechanic
Category: Jeep
Satisfied Customers: 5,809
Experience: Owner/Mechanic at 3D Automotive
Verified

Hi my name is ***** ***** I'll be more than happy to assist you, what model please?

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Customer reply replied 8 months ago
03
Customer reply replied 8 months ago
It started bucking at high speeds has done it 3 times in 2 days no check engine light or anything
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

never heard of an 03 jeep 03..........now please tell me what model and engine size.

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Customer reply replied 8 months ago
03 jeep grand Cherokee Laredo 4.0
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

thank you, ***** *****

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Customer reply replied 8 months ago
Ok
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

This condition at higher speeds may be the result of carbon build up on the exhaust valve and can be easilt cured by a decarbonizing procedure.

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Customer reply replied 8 months ago
It's like a hard jerk
Customer reply replied 8 months ago
It's not a constant buck usly just one time
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

usually, also, when its in overdrive and kicking like that its the torque converter clutch

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Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

check the tranny fluid. make sure its reddish, full and doesn't smell burnt

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Customer reply replied 8 months ago
That's when out l it does it what would need to be done
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

could you rephrase that please?

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Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

never mind, i got it

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Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

have you checked your fluid?

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Customer reply replied 8 months ago
I even took to a transmission shop and he came out and check it and said other then it being a Lil darker then new it was fine
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

what else did they check? did they run a diagnostics for transmission codes?

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Customer reply replied 8 months ago
Just ran code camshaft sensor and cranks shaft came up on codes
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

do you remember the code numbers?

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Customer reply replied 8 months ago
No I can re run them
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

ok, please do

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Customer reply replied 8 months ago
I cleared them out when I first checked and have been trying to get it to do it again no codes yet think it might be a crankshaft sensor going out
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

usually when crankshaft sensors are going out, it will cause a hard start or if you take a trip to the store and come back out and it wont start until you wait for a few minutes is another sign

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Customer reply replied 8 months ago
It does that in the morning have to crank it for a bit b4 it hits
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

then its very possible.

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Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

but please do not forget about the decarbonization process. carbon build up causes all types of issues.

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Customer reply replied 8 months ago
How do i do that
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

here

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Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

hows it going?

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Customer reply replied 8 months ago
Haven't been able to get it to do it again
Jeep Mechanic: David Craig, Auto Mechanic replied 8 months ago

ok, well that could be a good thing.

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Jeep Mechanic: David Craig, Auto Mechanic replied 7 months ago

still ok?

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