Question about 2004 Dodge Ram 1500
Dodge 57 hemi misfired have a 2004 dam 1500 4x4 5.7 hemi obd code indicates a cylinder #3 misfire I replaced plugs, wires, and swapped coil with another cylinder and air filter cleaned throttle body and mass air flow sensor while I had it appart but still code came back with cylinder #3 misfire but truck does not feel like it has a miss drives great and idles great so what could this be??
Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
you can try changing the ignition coil, I own a 97 Dodge 1500 and mine did the same and thats what i had to do.
Posted on Oct 08, 2008
Based on your readings, the fuel trim of -33 shows that it is running rich on that bank. Disconnect the coil on number one cylinder. With a 12 volt test light connected to ground, probe one of the two wires (engine running). One wire should be hot all the time, then connect the test light to a positive source (battery B+) and probe the other wire. The other sould be flashing on and off while running. The PCM provides ground to the circuit to fire the coils. If you don't have a pulsing light then the PCM circuit is faulty, if no constant power than the coil power source is in question. Don't attempt to fire the coil for testing without a load attached (spark plug) this burns out the driver in the PCM. Check continuity of the driver wire from PCM to the coil, if it is good and the other wire has power then the driver in the PCM is bad and a new PCM is what it will need. I hope this helps.
Posted on Apr 27, 2009
SOURCE: Check engine light
A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
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 wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner.
Posted on Jul 02, 2009
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