why does my GMC Sierra T1XX (2019-Present) lose power when accelerating?

Learn how to diagnose and fix power loss during acceleration in GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostics, and solutions.

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, fuel pressure gauge, socket set, torque wrench, cleaning supplies.
• Ensure safety: Park the vehicle on a flat surface, engage the parking brake, and disconnect the battery.

2. Address Fuel Pressure Issues

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail.
• Sub-step 2: Start the engine and observe the fuel pressure reading.
• Sub-step 3: If pressure is low, check and replace the fuel filter if clogged, or the fuel pump if necessary.
• Tools Required: Fuel pressure gauge, socket set.

3. Clean the Throttle Body

• Sub-step 1: Remove the air intake duct connected to the throttle body.
• Sub-step 2: Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding area.
• Sub-step 3: Reassemble the air intake duct and reconnect it.
• Tools Required: Throttle body cleaner, soft cloth.

4. Replace Ignition Components

• Sub-step 1: Remove the engine cover to access the ignition coils.
• Sub-step 2: Disconnect the electrical connectors from the ignition coils.
• Sub-step 3: Remove the coils and inspect the spark plugs for wear; replace if necessary.
• Sub-step 4: Install new ignition coils and reconnect electrical connectors.
• Tools Required: Socket set, torque wrench.

5. Inspect and Clear Exhaust Restrictions

• Sub-step 1: Visually inspect the exhaust system from the manifold to the tailpipe for any visible damage or restrictions.
• Sub-step 2: If a clogged catalytic converter is suspected, perform a back pressure test.
• Sub-step 3: Replace any damaged components if necessary.
• Tools Required: Exhaust back pressure gauge, socket set.