Misfiring code on 4 of my cylinders.I just got my plugs,wires,coils, rotor&cap,catalatic replaced.The cause?

Question

Help! I am desparate. My car is a nightmare! It's in the shop every month! The check engine light is always one. There is new codes every month. But the code that is always on is the spark plugs. What could be the cause of it running so rich?

Answer 1

Well.. putting down the year/make/model would have been nice.
The cause for a cylinder misfire is kinda a can of worms, but here's a few suggestions.
Buy a concentrated fuel injection cleaner, not something cheap, some potent, like Lucas brand, or Seafoam, or Regane.
Make sure the plugs you put in are correct for your car, stay away from the hype plugs (i.e. bosch +2 and +4). make sure they are gapped correctly.
the fuel injector cleaner should help with a possibly plugged injector. the correct gap will allow for a correct fire & burn.

The other thing to do is to get some carb spray, spray around the spark plugs, if the idle changes or you now hear a sucking sound, you found an air gap. Also spray around cylinder head. If the idle changes, and/or you hear a liquid sound being sucked in, guess what.. your cylinder head isn't torqued down correctlly.
It means that air is entering into a cylinder bank. This is unmetered air that the car computer is not aware of and can not compensate for, therefore, you get a misfire.

Answer 2

If the misfire code became interior the PCm earlier you replaced the plugs and wires, it is going to proceed to be interior the PCm until you sparkling it. Unhook the battery for a jiffy and see if it comes decrease back. If the engine continues to be lacking on cylinder #4, it may desire to be a defective gasoline injector. If the motor vehicle has been run a protracted time with a bad spark plug or cord on cylinder #4 it became dumping uncooked gasoline down the exhaust, which will smash the catalytic converters. A clogged catalyst from working the engine with a misfire will reason a complicated initiate, undesirable idle and shortage of potential on an identical time as using, basically like plugging up the exhaust pipe. in case you think a plugged catalyst, you could eliminate the oxygen sensors from the exhaust and see if the potential improves.

Answer 3

The first thing I would do is a running compression check. Most engines run around 60-70 psi . If the misfiring cylinders are low, you likely have valve or valve train problems. If all cylinders are relatively close, I would try swapping an injector from a known good cylinder and see if the misfire follows the injector. If it does, the injector(s) are likely plugged with debris. They should be cleaned or replaced. HTH! Good Luck!!