300c 3.5 V6 P0300 code - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 30 (permalink) Old 10-18-2012, 12:52 PM Thread Starter
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300c 3.5 V6 P0300 code

Hi

Have had the dreaded P0300 code for a year and just have been driving the car like normal for the past 14k miles. Other than the irritating MIL light and slight rough idle when the car parked up and running - no issues.

All stated after LPG conversion 2 years ago. Still less than half price of petrol and getting round 50mpg on daily long runs.

Put Sea Foam in PCV Valve pipe but other than the white fog on street, not cleared!

Other then this....see rolls beautifully!

Any ideas?
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post #2 of 30 (permalink) Old 10-18-2012, 01:10 PM
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That code pretty much means its detected a misfire but cannot tell you what cylinder. Does it come straight back after clearing the code? Have you replaced the spark plugs since the code came up? I have found spark plugs don't last as long running on lpg as they do on petrol.

Regards

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post #3 of 30 (permalink) Old 10-19-2012, 02:02 AM
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Fault Code: P0300

EOBD / ISO Description
Random / Multiple Cylinder Misfire Detected

Component / System Description
A common method of detecting misfires is to monitor the signal from engine speed sensor to check crankshaft acceleration / speed during each power stroke; this provides an indication of the power / torque contribution provided by the cylinder (compared to the other cylinders). Any fault with the cylinder, including mechanical faults, fuelling, ignition (petrol engines) or other faults affecting combustion, will affect the power / torque produced by the cylinder. Misfires can also be detected by the oxygen / lambda sensor, due to high oxygen content (unburned oxygen) in the exhaust gas. Also note that there is reference to manufacturers monitoring the strength of exhaust pressure pulses (which will be weak if a misfire exists); a weak pressure pulse is then linked to an individual cylinder by using cylinder identification sensors (cam shaft sensor etc).

Meaningful description and quick check
The fault code is indicating that there is a random misfire but it is not identifiable to specific cylinders. It is likely that the fault is causing erratic fluctuations of the crankshaft speed (or exhaust pressure pulses) which are not consistent to any one cylinder or group of cylinders. The fault could be related to any aspect of the engine operation including: fuelling, ignition (petrol engines), air leaks, mechanical condition etc. Also check (as applicable) for faults with variable valve timing, EGR and other emission control systems. It is also possible that there could be an engine position / speed sensor related fault.

NOTE 1. Check for other fault codes that could provide additional information. NOTE 2. If a fault cannot be located with the applicable components or wiring, it may be necessary to check operation of the control unit (ECU). NOTE 3. Communication between control units / modules can pass through a CAN-Bus system; check for CAN-Bus related faults and fault codes.


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post #4 of 30 (permalink) Old 10-19-2012, 02:58 AM Thread Starter
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Quote:
Originally Posted by Simon@thecustom300cshop View Post
That code pretty much means its detected a misfire but cannot tell you what cylinder. Does it come straight back after clearing the code? Have you replaced the spark plugs since the code came up? I have found spark plugs don't last as long running on lpg as they do on petrol.

Once cleared, it only happens when I am stationary eg at lights.

Other observations:-

1. Happens more regularly if petrol tank is above the red.
2. Top up ever 6 weeks or so with oil from min to max.

Will ask for the spark plugs to be changed on next service but they were changed 25k ago (NGK platinums)
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post #5 of 30 (permalink) Old 10-19-2012, 03:28 AM
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Does it do it if you clear it and run it on petrol only? Just wondering if its detecting a misfire when it switches from petrol to gas.
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post #6 of 30 (permalink) Old 10-20-2012, 01:11 AM
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I'm sorry as I know this is off topic but do you really get 50mpg?

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post #7 of 30 (permalink) Old 10-21-2012, 04:02 AM Thread Starter
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Quote:
Originally Posted by Simon@thecustom300cshop View Post
Does it do it if you clear it and run it on petrol only? Just wondering if its detecting a misfire when it switches from petrol to gas.
Hi tried this - no code comes on both so a fault pre LPG
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post #8 of 30 (permalink) Old 10-21-2012, 04:08 AM Thread Starter
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Quote:
Originally Posted by DATMAN View Post
Hi tried this - no code comes on both so a fault pre LPG
Hi pay 60p a litre for lpg (pre paid in advance in summer when LPG is cheaper). Petrol is 1.40 i.e 80p difference !!

Put 55l and get around 265 miles on a tank for long runs into work weekly

Would be a lot less say 220 miles for tank if stop/start journey.

Got latest BRC lpg system which was 1800 ish 2 years ago but this has been more than paid for in petrol savings since!!
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post #9 of 30 (permalink) Old 10-21-2012, 03:17 PM
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Quote:
Originally Posted by DATMAN View Post
Once cleared, it only happens when I am stationary eg at lights.

Other observations:-

1. Happens more regularly if petrol tank is above the red.
2. Top up ever 6 weeks or so with oil from min to max.

Will ask for the spark plugs to be changed on next service but they were changed 25k ago (NGK platinums)
How many miles do you do in 6 weeks?

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post #10 of 30 (permalink) Old 10-22-2012, 09:59 AM Thread Starter
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Quote:
Originally Posted by chrisp View Post
How many miles do you do in 6 weeks?
about 1700 miles.

But checked yesterday and not used any in last 4 weeks!
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