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Old 04-24-2011, 03:28 PM   #1
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2003 ram 2500 with only 112,000 . When out to start morning around 10 am and it started find but made a large loud noise. like the motor was pinging real loud. i then shut it of and hook up my superchips 3715 and it read code PO300 and yes i clear it and waited about 30 minutes and started it back up and same noise. and the check like was on again same code , but this time i did not clear it.

Any help out I would apprecieted , I hope this ain't no piston problem or crack rings? I am out of work for over 1 year and riding my motorcycle here in GA. I had the plugs change at 60,000 miles and the truck was in the shop for trottle body cleaning and of course they re program the computor with up dates back in oct 2010. before this happen the truck was running like a kittin with no problems and yes I have a CAI . Please someone can shine in here with some advice.

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Old 04-24-2011, 03:28 PM   #2
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2003 ram 2500 with only 112,000 . When out to start morning around 10 am and it started find but made a large loud noise. like the motor was pinging real loud. i then shut it of and hook up my superchips 3715 and it read code PO300 and yes i clear it and waited about 30 minutes and started it back up and same noise. and the check like was on again same code , but this time i did not clear it.

Any help out I would apprecieted , I hope this ain't no piston problem or crack rings? I am out of work for over 1 year and riding my motorcycle here in GA. I had the plugs change at 60,000 miles and the truck was in the shop for trottle body cleaning and of course they re program the computor with up dates back in oct 2010. before this happen the truck was running like a kittin with no problems and yes I have a CAI . Please someone can shine in here with some advice.
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Old 04-24-2011, 03:39 PM   #3
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P0300 - Random/Multiple Cylinder Misfire Detected. Don't know if there is a cheap/easy fix... hopefully someone will be along shortly to help you further on this.
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Old 04-24-2011, 03:44 PM   #4
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Here's some info that may help some. According to the manual:

Quote:
P0300-MULTIPLE CYLINDER MISFIRE
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
When Monitored:
Any time the engine is running, and the adaptive numerator has been successfully updated.
Set Condition:
When more than a 2% (2.5% LEV) misfire rate is measured during two trips. Above 3000 RPM 1 trip less than
3000 RPM 2 trip. Three good trips to turn off the MIL.
Possible Causes
(K342) ASD RELAY OUTPUT CIRCUIT
INJECTOR CONTROL CIRCUIT
COIL CONTROL CIRCUIT
IGNITION WIRE
SPARK PLUG
IGNITION COIL
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR
ENGINE MECHANICAL
PCM
Quote:
VISUAL INSPECTION
NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC.
NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector
Control circuit.
- Visually inspect the engine for any of the following conditions.
- Worn serpentine belt
- Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump.
- Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys
- Corroded PCM power and ground circuits.
- Improper CKP, CMP, MAP, and TP Sensor mounting
- Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ign coil, etc.
- Vacuum leaks
- Restricted Air Induction system or Exhaust system.
- Internal engine component failures.
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Old 04-24-2011, 04:32 PM   #5
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Obviously, there are a lot of possibilities. My first pick would be a broken valve spring. Run a compression test!
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Old 04-24-2011, 04:52 PM   #6
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Pull the valve covers first to see if it is a broken spring before doing a compression test.
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Old 04-25-2011, 06:50 AM   #7
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Quote:
Pull the valve covers first to see if it is a broken spring before doing a compression test.
I got to disagree, with that.
Pulling 8 plugs, will be a lot quicker, and easier for a novice.
1. There will be much less chance of making a mistake.
2. If u pull the covers, and the affected spring is in the down position, it may be missed.
3. If you pull a plug where the gap is closed, you'll know the affected cylinder.
4. If a piece of piston has broken off, that cylinder will most likely have lower compression.
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Old 04-25-2011, 08:47 AM   #8
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Yes, pull the spark plugs and inspect. Rotate the engine over by hand to inspect the valve springs and make sure the engine doesn't bind up on you while checking the valve spring operation. It's not a good idea to do a compression check if the engine is binding up. That will cause more damage. That could be the difference between a valve job or a new engine.

You could always have it towed to Jays shop. He does have a nice 6.1 Hemi engine that he could install for you.
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Old 04-25-2011, 02:53 PM   #9
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Quote:
It's not a good idea to do a compression check if the engine is binding up.
Thank you Captain Obvious.
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Old 04-25-2011, 03:33 PM   #10
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Quote:
Originally posted by Superjay:
Thank you Captain Obvious.
Thank you wise sir. That's a real complement coming from you Superjay.

A wise man said:

"What might be obvious to one man. It might not be so obvious to the other man."
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