I have a problem with my Renault Laguna 2.2D (1997) - when doing a constant speed the engine jerks violently. If I accelerate, it's fine. If I let go of the accelerator it's fine. It's also fine when idling. It's just when I'm doing a steady, constant speed, no matter what that speed is. I'm thinking it may be the fuel filter but I'd just like to be sure I'm not barking up the wrong tree before I change it as it doesn't look like the easiest of jobs and I don't want to pay a garage all the money I haven't got if that's not going to solve the problem. Thanks in advance to anyone who can advise me.
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Most likely it is the Throttle Position Sensor (TPS). Since 55 mph is a relatively constant speed for many drivers, the TPS get a work spot at that location and causes signal drop out to the ECM, resulting in a jerking feeling almost like a high speed intermittent engine misfire.
Determine whether the jerking is engine or transmission related. One way to determine if it is the transmission lock up converter is acting erratically is to down shift out of OD. And see if jerking persist. If it goes away suspect transmission to have problems with torque converter or TCC solenoid . If it doesn't go away determine whether or not the engine sounds to be misfiring. If so vehicle may require a tune up. Many vehicles can be diagnosed for free at your local Auto Zone.
I had a turbo renault , I cranked the wastegate down to increase boost and had same problem.
There was a sensor that cut the ignition if the turbo was over pressuring. Was a pretty violent jerking, felt like it was tearing the engine mounts out.
I had the exact same problem, The rear wheels have bushings that go out, they are only a few dollars. I changed that and it solved the problem. In addition I did change the throw out bearing and pilot bearing at the same time. Problem is now fixed