my Honda Civic won't accelerate past 30 mph what's the problem

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Fixing Throttle Position Sensor

• Remove the electrical connector from the TPS.
• Use a multimeter to test the resistance of the TPS according to the manufacturer’s specifications.
• If faulty, replace the TPS with a new unit.
• Reconnect the electrical connector and ensure it is secured.

3. Inspecting and Cleaning Air Intake

• Remove the air filter and inspect for dirt or blockages; replace if necessary.
• Check the intake ducts for cracks or loose connections.
• Clean the throttle body using throttle body cleaner and a soft cloth to remove carbon deposits.

4. Fuel System Check

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to read the pressure.
• If pressure is low, inspect the fuel pump and filter; replace as needed.

5. Ignition System Service

• Remove the spark plugs and inspect for wear or carbon buildup.
• Replace any faulty spark plugs with OEM or high-quality equivalents.
• Test ignition coils with a multimeter and replace if they do not meet specifications.

6. Transmission Fluid Inspection

• Locate the transmission dipstick and check the fluid level.
• If low, add the recommended transmission fluid type.
• If fluid is dirty or burnt, perform a transmission fluid change.