You’ll need to replace the catalytic converter if it is clogged. This leads to a back pressure increase, which chokes the engine from the exhaust side. As it revs up, more exhaust is created at one time. When the engine is idling, it may not sputter at all. If the catalytic converter has gone bad, it will show itself the most when you need power. The two most obvious signs that one has gone bad will be engine sputtering and a rotten egg smell. When a converter goes your vehicle is effectively choked. It scrubs the exhaust to remove pollutants. If it is leaking, consider it a fire hazard and don’t run the engine again until the injector has been replaced.Ī bad catalytic converter will cause your Silverado’s engine to sputter. That’s a strong indication that a fuel injector is leaking. Smell for gas right after running the engine. If the pressure looks good, you’ll need to determine if the injectors are clogged or leaking. Otherwise, you’ll more than likely have to drop the tank and replace the fuel pump.īefore going through all of that though, make sure to inspect the fuel lines for any crimping or damage. It’s easier to get to than the fuel pump. If the fuel pressure reading is below where it needs to be, checking and replacing the fuel filter would be the first thing to check. You’ll have to look up where it is for your particular model year and engine combo. Most vehicles have a port to manually check the fuel pressure. If there is not the engine will sputter like crazy, as it will be starved for fuel. There needs to be enough fuel pressure for the fuel to properly atomize at the injectors. It sends fuel through the fuel lines and filter to your its fuel injectors. The fuel system starts with the Silverado’s fuel pump, which will be in the gas tank. The next item on the list would be the fuel system. Here’s a great video to help you with that. If the plug wires check out, you’ll need to test the coil packs themselves. If you see spark coming from the wires, replace them and hopefully that will solve the problem. Wait until it is dark, turn off the headlights and check under the hood. An old trick that you can do to check them is to make sure that they are not bleeding spark. If the plugs look fine, check the spark plug wires (if so equipped), make sure that they look good (not dry rotted, not melted). The spark plug to the left was bad enough to cause a bad backfire and threw the P0301 trouble code, which indicated cylinder 1 had the misfire Here’s a more in depth guide on bad spark plugs. They can tell you a lot about what is going on with the engine. If there is reason to believe that the ignition system has gone bad, take a look at the spark plugs first. #See spark in the dark from coil pack on 99 silverado codeIf you do have a problem with the ignition system, you’ll more than likely get a diagnostic trouble code that indicates that there is a problem with the ignition system, such as P0300 (Random Multiple Misfire) or P030X where X represents the exact cylinder that is misfiring. Although with a modern vehicle, it should be able to go near – 100,000 miles without the plugs showing much damage. The spark plugs themselves can go bad over time. The coil or coil packs need to be strong. It relies on data from the crank and cam sensors to time the spark properly. Your ignition system is more than just the spark plugs. Here are the most likely causes of sputtering: This can radically reduce the time it takes you to diagnose the problem.Īny failure in the process listed above can lead to a sputtering engine. It is then expelled through the exhaust, where it is then scrubbed by the catalytic converter before being sent through the exhaust pipe.īefore diving into our list of the most common reasons that a Silverado’s engine sputters, make sure to check for trouble codes if you have a check engine light on. Once compressed, the mixture it is ignited by the spark plugs. The air is then guided into the cylinder where fuel is added and compressed. It pulls in air (where it is measured by the mass airflow sensor). If your Chevy Silverado has a sputter, it is most likely going to be caused by bad fuel system, ignition system, MAF sensor, or bad catalytic converter. A sputtering engine can indicate a number of problems.
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