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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.
The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.
P0301-P0308....2T catalyst........2004-05 Ram...Cylinder 1-8 Misfire Detected Conditions: Any time engine is running and the adaptive numerator has been successfully updated. When more than 1.5% (300M, Magnum), 2% (Durango, Ram), 2.5% (Durango LEV, Ram LEV), misfire rate is measured during 2 trips, or with 10-30% misfire during 1 trip. 3 good trips required to turn off MIL. Possible Causes: ASD relay output 2 circuit fault Injector control 1 circuit fault Coil control 1 circuit fault Ignition wiring, spark plug, or ignition coil fault Fuel pump inlet strainer plugged Restricted fuel supply line Fuel pump module fault Fuel pressure leakdown fault Fuel injector is damaged or has failed Engine mechanical problems exist PCM has failed. Hope this helps you. Thank You for using fixya.If you like this solution please rate it....Thank You, iluv2fish....Ray
TO DO A TUNE UP.YOU REPLACE AIR FILTER - SPARK PLUGS + WIRES.CHECK IGNITION SYSTEM.CHECK CHARGING SYSTEM.CHECK ALL ENGINE FLUIDS.CHECK ALL COOLANT HOSES AND VACUUM HOSES.CHECK THE COOLING SYSTEM.REPLACE FUEL FILTER.INSPECT BATTERY CABLES + BATTERY.IF YOU HAVE TO CLEAN BATTERY CABLES.TURN OFF RADIO FIRST SO YOU WONT LOSE RADIO CODE.CHECK CONDITION OF THE DRIVE BELT.IF LOOKS CRACKED OR MISSING RIBBS REPLACE IT.
is there a check engine light come on? you can go to the parts store and have them check the code for you. if there is a miss fire then it will show what cylinder it miss fire on.
more likely one of the coil is bad
there are indeed 16 plugs in the hemi engine. 8 of which are under the 8 ignition coils the other 8 are under the wires coming from the coils. You may have to remove some air filter tubing or engine covers to remove the coils, wires and plugs. good luck
Hey greenlee99, your best bet would be to grab one these manuals so that you have pictures and diagrams along with step by step instructions. It will tell you what tools and parts you need. Can't go wrong with having it.
This trouble code is Evap Purge System Performance fault. 1) Check for a loose or missing fuel cap. 2) Check for a damaged or missing fuel cap seal. Recheck for other trouble codes. This fault wont cause the stumblering problem. It turns on the MIL lamp to say there leak in the EVAP system.