Hi everyone, i have this problem on a 2004 dodge stratus with a 2.4L. The old engine bent a valve and since it had 199,xxx miles i decided to replace the engine. i replaced it with a motor from Autozone and now i am getting a cylinder 3 misfire. i changed the plugs, swapped coils, and injectors and i still get a cylinder 3 misfire. can anyone that has had this problem help me out on what else i might need to check? Any help would be greatly appreciated.

 

do you know if its an SBEC or NGC engine controller ,check wiring make sure connections are tight,you could try switching the ASD relay in power distribution box under the hood

 

I'm not familiar with the 2.4 specifically, but here's my 2-cents...

1. Pull the #3 plug wire, put in an extra plug (or the #3 plug), ground the the threaded part of the plug to a GOOD ground and have someone crank the motor to see if you get a spark. BE CAREFUL AND DON'T TOUCH THE CAR YOURSELF. Newer coils have a lot of voltage.... an old school spark plug tester or maybe a timing light are safer ways to see if you have spark coming down the plug wire.

2. check resistance on wire #3 and inspect terminal ends (both sides) OR just swap in a different #3 plug wire.

3. replace distributor cap (IF a 2.4 has a distributor)

Basically, trace the spark's path to cylinder #3. If the other cylinders fire, then distributor (if applicable) and coil/coil packs are good (or coil-on-plug if applicable is good since you said you changed coils). If a 2.4 is a coil-on-plug & switching coils didn't work, check the power feed wires to the #3 coil.

Sorry this is so vague since I'm no 2.4 expert..... you are approaching the problem the same way I would.... just keep going.

GOOD LUCK!