What Causes a 170 Gasoline Engine to Start and Then Stall Immediately?

[Judah]

170 gasoline engine starts and then stalls immediately for the following reasons: 1. Spark plug: The spark plug loses its ignition capability. 2. Throttle: The throttle malfunctions. 3. Carbon deposits: Carbon deposits cause incomplete combustion of gasoline, leading to engine shaking. Engine carbon deposits have a significant impact on the car. First, they reduce engine power, resulting in uneven power output and gradual attenuation—in other words, the engine becomes increasingly weak. Second, they increase fuel consumption, adding to your financial burden. Third, they make cold starts difficult, meaning the engine is hard to ignite. Severe carbon deposits in the combustion chamber can even cause cylinder knocking, producing noises during low-speed acceleration and damaging the pistons and crankshaft. This leads to engine overheating, severely compromising vehicle safety. Additionally, carbon deposits cause excessive emissions, not only failing annual inspections but also worsening environmental pollution. 4. Transmission load: Overloading the transmission degrades the quality and friction characteristics of the transmission fluid, increasing friction and wear. This results in transmission noise, and sludge (impurities or dirt) can form inside the transmission (e.g., in the valve body), causing issues like jerking, gear disengagement, impact, slipping, stalling, abnormal noises, delays, overheating, and oil leaks.

[StKathryn]

I have also encountered the issue of my 170 gasoline engine stalling immediately after starting. This problem usually stems from abnormalities in the fuel system or ignition system. When the fuel pump fails to supply fuel properly, the engine may stop abruptly due to lack of fuel, which is commonly seen with an aging fuel pump or a clogged filter. Severe carbon buildup on the spark plugs can cause unstable ignition, leading to stalling—especially if the spark plugs haven't been replaced for a long time. A clogged air filter restricts airflow, resulting in an overly rich air-fuel mixture and causing the engine to stall. It's recommended to first check whether the fuel level is sufficient, the spark plugs are clean, and the air filter has dust buildup. Don't forget to test the battery voltage—if it's too low, the system may fail. These simple checks can help you identify the issue, but if the problem persists, it's safer to consult a professional mechanic to prevent minor issues from escalating into major faults and affecting usability.

[DelGrant]

As someone who frequently tinkers with small engines, I believe that a 170 gasoline engine stalling after starting is mostly a fuel issue. I've encountered clogged fuel lines, and cleaning the filter and nozzles usually fixes it. Ignition coil failure is also possible—check the spark plug color to determine if it's damaged. Additionally, air leaks in the intake manifold can cause uneven air-fuel mixture, leading to stalling. Compression issues like worn piston rings shouldn't be ruled out either, as they reduce cylinder pressure. Maintenance advice includes regularly cleaning the fuel tank and using high-quality gasoline to avoid impurity buildup. Preheating for a few extra seconds before starting can also help with better ignition. These tips come from years of hands-on experience and can save a lot of time, effort, and repair costs. I hope sharing them proves useful to you.

[SanGrant]

Starting the 170 gasoline engine only to have it immediately stall is a headache, with potential root causes in several areas. A faulty fuel pump failing to supply fuel, worn-out spark plugs unable to ignite, or a clogged air filter restricting airflow could be the culprits. Sometimes it's as simple as a dead battery causing system instability. During troubleshooting, first check the fuel level, then try replacing the spark plugs. If the issue persists, test electrical components like relays. Address the problem early to avoid engine damage.