If you have spark and fuel but it wont start.....no combustion?

Answer 1

When the engine still does not start with spark and fuel, problem can be either a poor compression, timing problems, airflow hindrances, or improper sensors. Combustion can be inhibited by poor spark or low fuel pressure, even weaker ones. To identify the precise cause, a diagnostic check needs to be made properly.

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Answer 2

If you have spark and fuel but the engine won't start, it may be due to a lack of proper air intake or compression. Check for any blockages in the air filter or intake system that could restrict airflow. Additionally, ensure that the fuel is reaching the combustion chamber at the correct pressure and that the ignition timing is correct. If these components are functioning properly, there may be an issue with the engine's compression, possibly due to worn piston rings or a blown head gasket.

Answer 3

So, you have spark and fuel and still your engine refuses to amp up could mean a couple of serious things. A failure to get the correct compression is one of the most frequent causes indeed, the air and fuel being mixed inside the cylinders of the engine can only blow up, not explode, in case it is not properly compressed. This might be as a result of worn piston rings, blown head gasket and in some case timing. The other reason could be that the spark is occurring at the incorrect time due to the misadjusted ignition time. Also, ensure that indeed the fuel is getting into the combustion chamber and is not contaminated. A weak battery or a bad Crankshaft position sensor is one of those factors which in some cases will interrupt a combustion process. It can be easier to determine the cause by undergoing a compression test or diagnostic scan.