2002 mitsubishi galant 1 and 4 spark plugs no spark ....i need help . . i change the coil and plugs already still no spark..

you have to check spark from the plug....step1 pull out one of the plug wire step2 put one spark plug into the plug wire. step3- clip the plug body with jumper cable and the other to the negative(-)terminal step4 start the car and see if there is strong spark on the tip of the plug

Its common for this to happen if you have high millage, change the coil packs that should fix the problem

ignition controller (computer) - easy to check. hook up one or two of the old coils with old spark plugs. make sure plugs are touching metal on the motor (for grounding), have someone crank starter while you CAREFULLY observe plugs, you should see spark at plugs. if spart, i'd check for timing sensor problems, if no spark then problem is in ignition computer.

Sounds like ignition module may have gone out. No test for this.

Did you check the main electronic component, the ECU, to see if it's functioning as it should?

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable).

Otherwise, check the coils (coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Try it and keep us updated.

There is no simple answer, there are to many variables. If you have access to a scan tool, pulling the codes should help. Without them its back to old school hunt and peck method. At this point we need to narrow down the problem. You need to test for spark.

1. Tag and disconnect the spark plug wires from the spark plugs.
   
2. Remove the spark plugs and install the spark plug wires to each spark plug.
   
3. Ground (do not hold spark plug) the spark plug; check if spark occurs while engine is being cranked.
   

Crank the engine for no more than 2 seconds at a time to prevent flooding the engine with gasoline.
If you have spark, You will want to make sure you have fuel injector pulse, along with fuel pressure. If you have spark ..simply spray some starting fluid in through the air filter and hold the gas pedal to the floor and crank it over while spraying. If it fires up, you know it is fuel related( fuel pump, regulator, or ECM if no injector pulse) . If you have no spark then look at ignition coil connection and trace through to the distributor( if equipped ). The crank shaft sensor has a tendency to fail on these as well. This should give you a few things to test and check to start you on your way to narrowing it down. If you have no spark then look at ignition coil connection for power and trace through to the distributor( if equipped ). If it is DIS( no distributor). It may be the Crank sensor or the ECU. The crank shaft sensor has a tendency to fail on these as well.
The ECU uses the signal sent from the Crank sensor to trigger the spark and fuel injectors. ( make certain you have checked all fuses)

YOUR CAR ONLY HAS COIL PACKS. CHECK VOLTAGE AT HARNNESS, IF OK REMOVE COIL PACK FROM SPARK PLUG REMOVE BOOT CHECK FOR VOLTAGE THERE, IF NONE POSS. COIL PACK.

most new cars will go a long way without change.. on that car 60K miles and you need to change

may be it is the engine that good condition...