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94 Chevy corsica V6 3.1 SFI start engine turns but turn over what could it be?

Here are several potential causes:

- Bad spark plugs**: Worn-out or fouled spark plugs can prevent the engine from getting the spark it needs to ignite the fuel, leading to trouble starting.

- Faulty ignition wires**: Damaged or disconnected ignition wires can disrupt the flow of electricity from the ignition coil to the spark plugs, also causing starting problems.

- Malfunctioning fuel pump**: If the fuel pump is not working properly, it cannot deliver enough fuel to the engine, causing it to turn over without starting.

- Dirty fuel filter**: A clogged fuel filter can restrict the flow of fuel to the engine, leading to the same issue.

- Bad timing belt or chain**: If the timing belt or chain is misaligned, it can affect the engine's ability to fire at the correct time, resulting in starting difficulties.

- Starter issues**: A worn-out starter motor or a faulty solenoid can prevent the engine from cranking properly, causing it to turn over but not start.

- Engine control module (ECM) problems**: The ECM is the computer that controls many functions in the engine, including fuel injection and ignition timing. If the ECM is not working correctly, it can cause starting problems.