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Old Dude Wisdom:
- Spark at the plug - pull some plug(s), reconnect the lead, and check for spark at the electrode. Hot and Blue
- Fuel in the jug - Fuel injection or carb?
If plugs are wet, fuel but no spark
If plugs are dry, no fuel.
Make, Model, Engine, Year, Milage,?
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run the fault codes and fix the faulty sensor. use a code reader to reset the CPU from the battery change over.. Get a better mechanic because he should have known that if the engine cranks then the battery is good ( bought a battery for nothing) and the problem is else where ---like the immobiliser ---or key battery---- or cam/crank position sensor
spark plugs are deep in the head yet you should get all the the old fuel out first, stale fuel wont ignite and will also clogg fuel filter. you need a mix of atleast 70% new fuel even then its not good for the injecters. If its a manual gearbox a tow start is a quick fix although no go for auto's. cant be much wrong if car was fine when parked, plugs-fuel-filter and possibly fuel pump for sure. If that doesnt fix take plug out put in lead and crank engine to be sure you have spark even just put any plug you know works in lead leaving your plugs in engine just to check for spark y turning over engine looking for spark on plug good spark will be blue but any spark is good.
The spark at the plugs should be almost white hot or blue. An orange spark is very weak and may not be enough to ignite the fuel mixture when subjected to the pressures inside the compression chamber. It would not hurt to do a thorough tune up with new spark plugs, wires and ignition control module. If your engine has a distributor, replace the cap and rotor.
If it will turn over check to see if its fuel or fire. To check for fuel, spray quick start for a few seconds into intake. If it starts and stops. its fuel. Change fuel filter and check fuel pump. If it does not start its fire, Could be distributor cap, rotor, coil, spark plug wires or spark plugs. If it does not turn over it could be battery or starter. Check battrey connections, ground strap from motor to body and ground wire from battery to motor and body.
If you are getting spark to the plugs, (and assuming nothing has happened to screw up the timing of the spark), the only thing that would cause the car not to start is that you are not getting fuel into the cylinders. You can check this by squirting some ether into the air intake of the engine. You can get some start spray at an auto parts store.