Fault Code P0300 - MG-Rover.org Forums

Silver9 · 20-04-2011, 15:21

Hi All,

Wonder if anyone could help me please. My 04 MG ZS 120 on startup in the morning has been idiling high at about 1200+RPM with a fluctuating amount of revs. After a minute or two of driving the car has driven and revved as normal. Today I plugged in a fault reader and it is telling me I have error code P0300 which is random/multiple cylinder misfire detected. After searching these forums I've come upon a couple of previous threads in relation to this error code. I'm intending to change the spark plugs and coils to see if this solves the problem, is this the correct course of action and can advise what other possible problems it could be?

Best Regards

BLMC · 20-04-2011, 15:25

Yes, try those items first.

Silver9 · 26-04-2011, 15:39

I have now switched the spark plugs and both coils, still having the same issue though. I did how ever clear the fault code before I undertook the work, after taking the car on a 3 to 4 mile run the diagnostic machine says there are no fault codes currently. Just starting to wonder whether i'm worrying over nothing.

Thanks

xsduk · 26-04-2011, 15:52

Is it a throttle position sensor?

Silver9 · 26-04-2011, 16:12

Quote:

Originally Posted by xsduk

Is it a throttle position sensor?

If it was the throttle position sensor would it not be constantly faulty rather than just when the cars cold?

Silver9

Aries1604 · 26-04-2011, 21:08

Inlet Manifold Gasket failure?

zsdave · 27-04-2011, 05:58

I saw a Land rover freelander that was doing this.

blew the back box clean in two! it was the Distributer! not sure if the 120'5 have these but know it shares the same K series engine

20-04-2011, 15:21	#1
Silver9 Registered User Join Date: Oct 2010 Car: MG ZS Posts: 7	Fault Code P0300 Hi All, Wonder if anyone could help me please. My 04 MG ZS 120 on startup in the morning has been idiling high at about 1200+RPM with a fluctuating amount of revs. After a minute or two of driving the car has driven and revved as normal. Today I plugged in a fault reader and it is telling me I have error code P0300 which is random/multiple cylinder misfire detected. After searching these forums I've come upon a couple of previous threads in relation to this error code. I'm intending to change the spark plugs and coils to see if this solves the problem, is this the correct course of action and can advise what other possible problems it could be? Best Regards

26-04-2011, 21:08	#6
Aries1604 Registered User Join Date: May 2009 Car: Rover 45 KV6 Posts: 1,427	Inlet Manifold Gasket failure? Last edited by Aries1604; 26-04-2011 at 21:15.

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20-04-2011, 15:25	#2
BLMC Registered User Join Date: Mar 2002 Location: GBR Car: - Posts: 24,825	Yes, try those items first.

26-04-2011, 15:39	#3
Silver9 Registered User Join Date: Oct 2010 Car: MG ZS Posts: 7	I have now switched the spark plugs and both coils, still having the same issue though. I did how ever clear the fault code before I undertook the work, after taking the car on a 3 to 4 mile run the diagnostic machine says there are no fault codes currently. Just starting to wonder whether i'm worrying over nothing. Thanks

26-04-2011, 15:52	#4
xsduk Registered User Join Date: Oct 2007 Location: Baldock Car: MG ZS TROPHY BLUE 180 mk1 Posts: 1,170	Is it a throttle position sensor?

27-04-2011, 05:58	#7
zsdave Registered User Join Date: Nov 2010 Car: MG ZS Posts: 102	I saw a Land rover freelander that was doing this. blew the back box clean in two! it was the Distributer! not sure if the 120'5 have these but know it shares the same K series engine

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