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Old 11-09-2013, 06:45 PM
klruff1 klruff1 is offline
Dodge Ram Forum Newcomer
Join Date: Nov 2013
Location: LBI NJ
Posts: 1
Gender: Male
Vehicle: 2005
Trim Level: Daytona
Color: silver
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
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Default Multi-Misfire

Have owned my 2005 Ram 1500 Daytona Quad Cab for 3.5 years now. Love the looks and ride of the truck but it has been nothing but trouble since the drive home from the dealership. Current issue I am in dire need of help with is a multi-misfire (P0300). Engine misfires from abiout 1000-2000 rpm's and runs perfect above that. The misfire has fouled my bank 1 sensor 1 O2 sensor twice already, just installed another new one today. Strange thing is out scanner is showing misfires on the passenger side of the engine only (cylinder 1/3/5/7). If we disconnect the battery for awhile to reset the computer, the truck runs perfect for about 20-30 miles, then is starts the misfire again. My mechanic friend and I are just about out of ideas, here is what we have done thus far:

1. Wires replaced. No change.
2. Coil packs replaced. No change.
3. Plugs inspected, look perfect.
4. Fuel pressure on rail checked. Perfect.
5. O2 sensor 1/1 replaced due to fault code 3 times. Code gone each time but still have a misfire on 1/3/5/7 cylinder.
6. All harness inspected, wiggled while truck was running. No change.
7. Throttle body inspected, was clean. No change, harness also checked good.
7. Several ground wires were changed or cleaned. Both grounds running from the valve covers to the block were either not connected or loose with bad corrosion. Those grounds were replaced with heavier wire and grounded to alternator stud. 4 other ground wires were cleaned and reconnected. Better at idle but still has a misfire when performing a power braking test, misfire from 1100-1800 rpms or so, above that it's fine, below that it's fine. We also installed a ground wire to the throttle body, still no change.
8. Replaced cam sensor, no change.
9. Replaced crank sensor, no change.
10. Replaced EGR, no change

I had a misfire issue once before, had to replace a coil pack, replaced all plugs with Champion Copper OEM plugs (still good), an injector, and the gas pedal (sensor is known to go bad). I just ordered 2 more parts today, they should be in Tuesday:

1. Gas Pedal (again! This will be the 3rd on the truck)
2. Throttle Body

Only other thing we can think of if these 2 parts don't fix it is the PCM. Don't know why the truck runs perfect after a reset then starts misfiring again after 20 miles. Any ideas?

Thanks for any advice!

Keith in NJ
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Old 11-10-2013, 12:44 AM
dalboa dalboa is offline
Dodge Ram Forum Senior Member
Join Date: Nov 2013
Location: Kansas
Age: 54
Posts: 75
Gender: Male
Vehicle: 2003 Ram 1500 4x4
Trim Level: SLT
Color: Black
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
dalboa is on a distinguished road

I've discovered there is some potential for this kind of condition when moisture is getting into the cylinder. Don't know off hand if yours has the plastic intake but if it does I would suspect a leak somewhere into the cylinder if there is water getting into the engine compartment. If it is plastic, the misfires probably aren't good for it either. It's actually not too hard to remove. The head gasket of course is also an easy way for moisture to get in if it is going bad. Are you seeing any white steamy exhaust? Smell the exhaust to see if there is any aroma of anti-freeze.
If it aint broke, find out why!

Last edited by dalboa; 11-10-2013 at 12:52 AM.
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