What would cause an engine vibration on a 98 dodge neon the vibrating happens at all speeds idler even if is working in parking or neutral?

Engine vibration in a 1998 Dodge Neon at all speeds, even in neutral or park, strongly suggests a problem *outside* the engine's internal components. While a severely unbalanced engine *could* cause this, it's less likely given the consistent vibration regardless of engine load. Here's a breakdown of the most likely culprits:

* Motor Mounts: This is the most common cause. The motor mounts isolate the engine from the chassis. Worn or broken motor mounts allow excessive engine movement, leading to significant vibration felt throughout the car. Visually inspect the mounts for cracks, tears, or excessive sagging.

* Transmission Mounts (if applicable): Similar to motor mounts, worn transmission mounts can cause vibrations, especially if the transmission is a separate unit from the engine.

* Driveshaft/U-joints (if applicable): A worn driveshaft or failing U-joints (universal joints) can transmit vibrations throughout the car, even when in neutral if the problem is severe. This is less likely to cause vibration in neutral and park, but still possible if the damage is significant.

* Exhaust System: A loose or damaged exhaust system can cause vibrations, particularly if it's contacting the chassis or other components. Listen for rattling or unusual noises from the exhaust.

* Flywheel/Flexplate: While less common as the primary cause of vibration at all speeds and in neutral, a damaged flywheel (manual transmission) or flexplate (automatic transmission) can contribute. This is more likely to be felt as a pulsating vibration.

* Wheel Balance/Alignment: While unlikely to be the *sole* cause of the vibration in neutral, severely unbalanced wheels or misalignment *could* amplify existing vibrations. Check this if the other possibilities are ruled out.

Troubleshooting Steps:

1. Visual Inspection: Start by carefully inspecting all the motor mounts and transmission mounts (if applicable). Look for cracks, tears, or excessive deflection.

2. Listen for Unusual Noises: Pay attention to any rattling, grinding, or unusual sounds coming from the engine bay, exhaust, or drivetrain.

3. Check for Loose Components: Inspect the exhaust system, especially near connections and supports.

4. Test Drive (carefully): While driving, try to pinpoint the source of the vibration. Is it more pronounced in certain areas of the car? Does it change with speed or RPM?

5. Professional Inspection: If you're not comfortable performing a thorough inspection yourself, take your Neon to a qualified mechanic. They can diagnose the issue and recommend the necessary repairs.

It's crucial to address this vibration promptly. Continued operation with significant vibration can cause further damage to other vehicle components.