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It's never a good idea to just replace parts to attempt a repair. First find out WHY the engine will not start. By replacing parts you have introduced other possibilities into the possible reasons for the engine not running. Always go back to the basics: Fuel, Spark and Compression. If you have the three in the proper timing, the engine should start. You did not mention if the engine "cranks" when you try to start it but since you claim that the starter is ok I'll assume that it cranks. Check to see if there is a spark. Pull a spark plug wire, either use a tester or connect a spare spark plug to the wire and set it on the engine block while you attempt to start the engine. If you get no spark, trace everything back to see if voltage is getting to the coil before replacing the coil. Same thing with fuel. See if there is fuel pressure to the injectors or if there is fuel at the carb if it isn't injected. Get a compression tester to see if something bad has happened internally. If the timing chain/belt has slipped and you have no compression the engine will never start. It's always a matter of going back to the basics.

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Q: Wont start- starter ok -battery ok -fuses ok- replaced a coil to see if that was bad but seems like coils are no problem- changed spark plugs- how can you start your car please?
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