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Unread 06-19-2013, 10:39 PM   #1
gnarlyxcharlie
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97 xj jerking under steady driving

Lately I've been having this problem where around anywhere from 45-75 mph, if I am holding steady on the pedal, the jeep will buck almost. I feel a clunk and its as though the entire jeep moves.

Sort of a jerking sensation. And it will happen several times in a row if I hold the pedal steady.

It's really hard to explain but my brother claimed his wife's xj did the same thing and he removed the front driveshaft to fix it. I'm hoping that is not the case. Also, I've had a worn out u-joint for quite awhile if that could have anything to do with it .

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Unread 06-20-2013, 11:25 AM   #2
CJ7-Tim
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Fix any known issues.

Is the Check Engine Light ON ?

Are all your tune-up parts fresh ? How old is your battery ?

Have you tested any of the usual suspects like the Crankshaft Position Sensor, Coolant Temperature Sensor, Throttle Position Sensor, Manifold Absolute Pressure sensor and inspected their wire plugs/wire harness ?
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Unread 06-20-2013, 03:45 PM   #3
gnarlyxcharlie
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Quote:
Originally Posted by CJ7-Tim View Post
Fix any known issues.

Is the Check Engine Light ON ?

Are all your tune-up parts fresh ? How old is your battery ?

Have you tested any of the usual suspects like the Crankshaft Position Sensor, Coolant Temperature Sensor, Throttle Position Sensor, Manifold Absolute Pressure sensor and inspected their wire plugs/wire harness ?
Ordered a throttle sensor and u-joint. No check engine light. Ignition wires looked pretty old I replaced those and all the harnesses seem okay.

Battery isn't old, isn't new. Doesn't seem to be a problem as far as I can tell.
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Unread 06-20-2013, 06:22 PM   #4
sluff28
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so go ahead and pull the front shaft and drive it if it stops then you replace the u joints 3 of them on the front shaft.
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Unread 07-09-2013, 05:07 PM   #5
gnarlyxcharlie
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Put in a new TPS. Didn't help. Ripped the front driveshaft. still jerks around. its incredibly annoying on the highway as it will happen five or six times in 10 second span
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Unread 07-09-2013, 05:13 PM   #6
xjpete
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Crack in the distributor? Put some fuel injection cleaner in also.
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Unread 07-10-2013, 05:01 AM   #7
CJ7-Tim
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Are ALL the tune-up parts fresh ? Have you tested any of the usual suspects like the Crankshaft Position Sensor, Coolant Temperature Sensor, Throttle Position Sensor, Manifold Absolute Pressure sensor and inspected their wire plugs/wire harness ? Have you cleaned and inspected all the battery wires ? Have you Load Tested the battery ?
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Unread 07-11-2013, 06:34 PM   #8
gnarlyxcharlie
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Quote:
Originally Posted by CJ7-Tim View Post
Are ALL the tune-up parts fresh ? Have you tested any of the usual suspects like the Crankshaft Position Sensor, Coolant Temperature Sensor, Throttle Position Sensor, Manifold Absolute Pressure sensor and inspected their wire plugs/wire harness ? Have you cleaned and inspected all the battery wires ? Have you Load Tested the battery ?
Crank sensor is new, throttle sensor is new. Cleaned battery terminals, wires seemed okay. Going to load test the battery and the alternator tomorrow.

What should I buy for a tune up. Plugs, wires, cap and rotor. Anything else? I'm new to this.


I'll see if my brother will bring me something to test the sensors with tomorrow. Both O2 sensors are also less than 2 months old. Catalytic convertor. It feels mechanical when it jerks, not like a sputter or anything.
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Unread 07-11-2013, 07:19 PM   #9
xjpete
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Air filter,check engine coolant when it is cool,all fluids should be checked.
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Unread 07-12-2013, 04:55 AM   #10
CJ7-Tim
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Champion Copper Top spark plugs, wires, cap and rotor, ignition coil. Throttle Body Cleaner, Air Filter.

You should also test the Coolant Temperature Sensor, and the MAP Sensor. Inspect the wire harnesses for any chafed/melted insulation, broken wires, and/or corroded wire plugs.
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According to the National Shooting Sports Foundation, AR-15 sporting rifles account for nearly 20% of all U.S. firearms sales.

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