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HomeRepair HelpMTD RepairMTD Pressure washer won't start Repair
MTD Pressure washer won't start
If your MTD gas pressure washer won't start, begin with the spark plug, the most likely cause. Inspect it for a cracked insulator, burned electrode, or heavy carbon buildup, then use a spark plug tester to check for a strong spark while the engine cranks. A clogged carburetor is another common reason a pressure washer is not starting. Stale or ethanol-blended fuel left in the carburetor during seasonal storage can evaporate and leave sticky residue that blocks fuel flow. Clean the carburetor with carburetor cleaner, or replace it if cleaning does not restore operation. If the spark plug works, test the ignition coil, which supplies voltage to the plug. A sheared flywheel key can also prevent the engine from starting, especially after the pressure washer stops suddenly or hits a hard object. These checks address why your power washer won't start before you replace more expensive parts. Enter your model number to find the exact MTD spark plug, carburetor, ignition coil, or flywheel key for your pressure washer.
01 - MTD Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
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02 - MTD Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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03 - MTD Ignition Coil
The ignition coil sends voltage to the spark plug while the engine is running. If the ignition coil is defective, the engine may not start. Before replacing the ignition coil, ensure that the spark plug is working properly. If you have confirmed that the spark plug is working properly, test the ignition coil with an ignition coil tester. If the ignition coil is defective, replace it.
Common
04 - MTD Flywheel Key
the flywheel key might have sheared in half. The flywheel key is a small metal piece which fits into the crankshaft and engages with the flywheel. If the engine stops suddenly due to the pressure washer hitting a hard object, the flywheel key breaks in half to prevent damage to the engine. To determine if the flywheel key is broken, remove the flywheel from the engine and inspect the flywheel key. If the flywheel key is broken, replace it.
Common
Frequently Asked Questions
Why won't my MTD pressure washer start?
How do I test the spark plug and ignition coil when my pressure washer won't start?
Why won't my MTD pressure washer start after the engine stopped suddenly?
What should I check if my pressure washer starts but won't stay running?
How do I find the correct MTD pressure washer spark plug, carburetor, or ignition coil?
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