Troubleshooting Car Jerking After a New Transmission Installation

A new transmission should bring smooth, reliable driving, but sometimes, a car might start jerking after the installation. This can be frustrating, but it’s usually fixable. Here’s a guide to common causes and troubleshooting steps⁚

Possible Causes

1. Improper Transmission Fluid Level⁚ Too much or too little transmission fluid can disrupt the internal pressure and cause jerking.
2. Air in the Transmission Lines⁚ Air bubbles trapped in the transmission lines can interrupt fluid flow, leading to shifting problems.
3. Faulty Transmission Control Module (TCM)⁚ The TCM controls shifting, and a malfunction can cause jerky shifts or delayed engagement.
4. Damaged or Worn Transmission Parts⁚ Even if the transmission was new, it’s possible that parts like the torque converter, valve body, or solenoids were damaged during installation or were already worn.
5. Incorrect Transmission Programming⁚ Modern transmissions require specific programming for optimal performance. If the programming is not done correctly, it can lead to jerking.
6. Engine Issues⁚ Problems with the engine, like misfires or fuel delivery issues, can also contribute to jerky behavior.

Troubleshooting Steps

1. Check Transmission Fluid Level⁚ Make sure the transmission fluid is at the correct level and is clean. Consult your owner’s manual for the proper procedure.
2. Bleed Air from Transmission Lines⁚ A mechanic can help bleed air from the transmission lines; This involves running the engine and cycling through gears to remove air bubbles.
3. Have the TCM Diagnosed⁚ Use a scan tool to check for any error codes related to the transmission control module.
4. Inspect for Damaged Transmission Parts⁚ If the jerking persists, a mechanic should inspect the transmission for damaged or worn parts.
5. Reprogram the Transmission⁚ If the transmission needs specific programming, a qualified mechanic can use a scan tool to reprogram it correctly.
6. Check Engine Systems⁚ If engine problems are suspected, have the engine checked for misfires, fuel pressure issues, or other problems that might affect the transmission’s operation;

When to Seek Professional Help

If you are unable to diagnose and fix the problem yourself, it’s crucial to take your car to a reputable mechanic. A professional can accurately diagnose the issue and perform the necessary repairs.

Remember, a jerking car can be a safety hazard. Do not ignore the problem, and seek professional help if needed.