Stihl 084 Problems And Solutions

Are you a proud owner of the Stihl 084 chainsaw? While this powerful tool is known for its durability and performance, it’s not immune to a few hiccups along the way. In this blog post, we will discuss some Stihl 084 Problems and provide you with practical solutions to get your chainsaw back in top shape.

Stihl 084 Problems: Potential Causes

Chainsaw Not start

Potential causes:

  • Empty fuel tank: Ensure that the fuel tank is filled with fresh fuel.
  • Clogged fuel filter: Check and clean or replace the fuel filter.
  • Spark plug issues: Inspect the spark plug for fouling or damage, and replace if necessary.
  • Ignition system problems: Verify the ignition coil, spark plug wire, and kill switch are functioning properly.
  • Carburetor issues: Check for clogs or malfunctioning components in the carburetor.

Oil pump problem

Potential causes:

  • Clogged oil filter or pickup tube: Clean or replace the oil filter and ensure the pickup tube is clear of debris.
  • Worn or damaged oil pump: Inspect the oil pump for wear or damage and replace if necessary.
  • Low oil level: Ensure there is sufficient bar and chain oil in the reservoir.
  • Faulty oil pump drive gear: Examine the drive gear for any faults and replace if needed.

Starter rope broken

Potential causes:

  • Wear and tear: Over time, the starter rope can fray or break due to regular use.
  • Improper handling: Pulling the starter rope forcefully or at an angle can cause it to break prematurely.
  • Mechanical failure: There may be a problem with the recoil starter mechanism, such as a broken spring or faulty pulley.

Loud noises

Potential causes:

  • Loose parts: Check for loose muffler bolts, clutch cover, or other components that could create noise when vibrating.
  • Damaged or worn-out parts: Inspect the cylinder, piston, crankshaft bearings, and other internal components for signs of damage or wear.
  • Exhaust system issues: Look for cracks, holes, or damage in the exhaust system that could cause excessive noise.

Saw chain rotates at idle speed

Potential causes:

  • Idle adjustment: The idle speed may be set too high, causing the chain to rotate even at idle. Adjust the idle screw to the correct specifications.
  • Carburetor problems: A malfunctioning carburetor can lead to improper fuel mixture, resulting in the chain rotating at idle. Clean or repair the carburetor as needed.

Chain receives no oil

Potential causes:

  • Clogged oil channels: Check the oil channels, oil pump, and oil filter for clogs or obstructions. Clean or replace them if necessary.
  • Low oil level: Ensure the bar and chain oil reservoir is adequately filled.
  • Faulty oil pump: Inspect the oil pump for any damage or wear. Replace if required.

No spark

Potential causes:

  • Faulty ignition coil: Test the ignition coil using a spark tester and replace it if no spark is detected.
  • Wiring issues: Check the spark plug wire and connections for any damage or loose connections. Repair or replace as needed.
  • Ignition switch or kill switch problems: Verify that the switches are functioning correctly and replace if faulty.

Poor acceleration

Potential causes:

  • Dirty air filter: Inspect and clean or replace the air filter to ensure proper airflow.
  • Fuel delivery issues: Check the fuel lines, fuel filter, and carburetor for clogs or blockages. Clean or replace these components as necessary.
  • Spark plug fouling: Examine the spark plug for fouling or wear and replace if needed.
  • Carburetor adjustment: Improper carburetor settings can affect acceleration. Adjust the carburetor to the manufacturer’s specifications.

Carburetor floods, engine stalls

Potential causes:

  • Float valve malfunction: The float valve may be sticking or not closing properly, causing the carburetor to flood. Clean or replace the float valve.
  • Incorrect float height: Check and adjust the float height according to the manufacturer’s specifications.
  • Clogged fuel passages: Clean the carburetor thoroughly, ensuring all fuel passages are clear of debris or varnish buildup.

Engine overheating

Potential causes:

  • Airflow obstruction: Inspect the cooling fins and air intake for dirt, debris, or blockages. Clean them to ensure proper airflow.
  • Lean fuel mixture: Verify that the carburetor is set to the correct fuel-air ratio. Adjust if necessary.
  • Cooling system problems: Check the fan, radiator, and coolant levels (if applicable) for any faults or deficiencies. Repair or replace as needed.
  • Worn piston rings or cylinder: Examine the piston rings and cylinder walls for wear or damage. Replace them if required.

Stihl 084 Troubleshooting Tips

Check fuel and spark plugs

  1. Ensure that the fuel tank is filled with fresh fuel, free from contaminants.
  2. Inspect the spark plug for fouling or damage. Clean or replace the spark plug if necessary.
  3. Confirm that the spark plug wire is securely connected to the spark plug.

Inspect and clean oil pump

  1. Examine the oil pump for any debris, clogs, or damage. Clean it thoroughly to ensure proper oil flow.
  2. Check the oil filter and clean or replace it if needed.
  3. Verify that the oil pickup tube is clear of obstructions.

Replace starter rope

  1. Remove the old, broken starter rope from the recoil starter assembly.
  2. Install a new starter rope, following the manufacturer’s instructions.
  3. Ensure that the new starter rope is properly wound onto the recoil starter pulley.

Check for loose parts or worn components

  1. Inspect the chainsaw for any loose bolts or screws, particularly in the muffler, clutch cover, and other vibrating parts. Tighten them as necessary.
  2. Examine the cylinder, piston, crankshaft bearings, and other internal components for signs of wear or damage. Replace any worn-out parts.

Clean or replace oil filter

  1. Locate the oil filter on the chainsaw and remove it.
  2. Clean the oil filter thoroughly using an appropriate solvent or replace it with a new one.
  3. Reinstall the clean or new oil filter securely.

Check ignition coil and spark plug

  1. Test the ignition coil using a spark tester to determine if it is producing spark.
  2. If no spark is detected, replace the faulty ignition coil.
  3. Verify that the spark plug wire is properly connected to both the ignition coil and spark plug.

Inspect carburetor and air filter

  1. Remove the air filter cover and inspect the air filter for dirt, debris, or damage.
  2. Clean the air filter if it is dirty or replace it with a new one if necessary.
  3. Examine the carburetor for any clogs or malfunctioning components. Clean or repair the carburetor as needed.

Adjust carburetor settings

  1. Refer to the chainsaw’s manual for the correct carburetor adjustment procedure.
  2. Use a tachometer to measure the engine speed while adjusting the idle and high-speed mixture screws to the recommended specifications.
  3. Fine-tune the carburetor settings until the chainsaw accelerates smoothly and operates correctly.

Check cooling system and ventilation

  1. Inspect the cooling fins on the cylinder and clean them of any dirt, debris, or blockages that restrict airflow.
  2. Ensure that the air intake vents are clear of obstructions.
  3. If the chainsaw has a cooling fan, check its operation and clean any accumulated debris.
  4. If applicable, verify the coolant level in the radiator and refill if necessary.

stihl 084 problems


Don’t let these common problems deter you from experiencing the full potential of your Stihl 084 chainsaw. By following these simple troubleshooting steps and implementing the suggested solutions, you’ll be able to overcome any hurdle that comes your way. Remember, regular maintenance and care are crucial for the longevity of your chainsaw, so don’t neglect them.