Don't make sharp turns!
First of all, you need to add more detail. Jerking can be due to an engine misfire which should be detected by the Engine Computer. If it's bad enough, it will set a diagnostic fault code indicating which cylinder is responsible. The cause is likely to be related to a wiring problem. A failed component would not be affected by turning. The engine shifts and the suspension height changes on each side when turning, and that can tug on wiring harnesses. There can be a corroded terminal in a connector that makes intermittent contact when it's being tugged on. If the problem is with a wire going to a sensor, the Engine Computer will detect that.
Not all fault codes turn on the Check Engine light. There's over a thousand potential fault codes and only about half of them turn the light on. The place to start with a misfire is to have the fault codes read. Many auto parts stores will do that for you for free.
If there are no codes, you'll need a scanner to view live data while the problem is occurring. Most scanners have a record feature that allows a few seconds of data to be recorded during the event. Later it can be played back slowly to see what was changing.
Jerking when turning can also be caused by a binding universal joint or cv joint on the front axle. That is a mechanical issue and will not be detected by any computer. The clue is twice per wheel rotation the steering wheel will push back toward center. Even with a good cv joint, this can happen if the truck has been raised. This happens mostly in four-wheel-drive when there's torque on the joints, but it will happen also when not in four-wheel-drive because even though there's no load on the joint to cause it to bind, it is still turning since it's tied right to the wheel bearing. By the time it gets that bad you should have been hearing noises from the joint for quite a while.
Saturday, February 8th, 2014 AT 2:56 PM