Misfire p0300 code , very rough idle

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My Name: Neilcmusic1

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Posts: 57
Joined: Sun Feb 02, 2020 7:16 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.6
Fuel Type: Petrol
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
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On a short journey today the c3 started to shudder as I pulled away from a junction , as if I was in the wrong gear . Car now shudders on a stand still and pulls away very slowly , code reads something like "random/multiple misfires " engine code flashes and goes off , however problem continues . When I start the car it idles rough and then there's a click as if something happens , it then runs slightly better for about 10 seconds , then rough again and clicks again and continues doing the same in a continuous loop . I know there are a number of possibles , coils , plugs etc , however does the click indicate anything ? , Any help would be appreciated .

Just a thought , last week I broke down , appeared to me that although car read 1/4 tank the symptoms were pointing to no fuel , got a fuel can , put £5.00 worth in it to get me to a petrol station and it was fine , just thought it was interesting as never had the gauge read incorrectly in the past
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My Name: C3CAR

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Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Neilcmusic1 wrote: Tue Feb 25, 2020 4:28 pm On a short journey today the c3 started to shudder as I pulled away from a junction , as if I was in the wrong gear . Car now shudders on a stand still and pulls away very slowly , code reads something like "random/multiple misfires " engine code flashes and goes off , however problem continues . When I start the car it idles rough and then there's a click as if something happens , it then runs slightly better for about 10 seconds , then rough again and clicks again and continues doing the same in a continuous loop . I know there are a number of possibles , coils , plugs etc , however does the click indicate anything ? , Any help would be appreciated .

Just a thought , last week I broke down , appeared to me that although car read 1/4 tank the symptoms were pointing to no fuel , got a fuel can , put £5.00 worth in it to get me to a petrol station and it was fine , just thought it was interesting as never had the gauge read incorrectly in the past
P300, multiple misfire (on more than one injector.)

Maybe running the tank out of fuel has allowed the filter to clog? (Is you fuel filter in the tank?)

Could be a fuel starvation that causes misfire, due to the filter or a blockage?
My Name: Neilcmusic1

Experienced Member
Posts: 57
Joined: Sun Feb 02, 2020 7:16 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.6
Fuel Type: Petrol
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Has thanked: 1 time
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I did think about that , however it has been running fine for 2 days since , I also wondered whether the fuel pump had died 2 days ago , however as I stated putting £5 worth of fuel got it going , if it is a filter issue would going for a blast down the motorway sort it ?
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My Name: C3CAR

Guru
Posts: 2634
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 154 times
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I think if the fuel filter or system is partially blocked then a blast won't do it any good, but it has been known to clear some faults. It has to be worth a try though.
My Name: Neilcmusic1

Experienced Member
Posts: 57
Joined: Sun Feb 02, 2020 7:16 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.6
Fuel Type: Petrol
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Has thanked: 1 time
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I've tried it , it didn't work and I didn't want to push it too hard as is probably only firing on 3 cylinders , tomorrow , I'll try plugs and coil pack , coil pack is £75 at eurocarparts , could be worse , I'll let you know , it's shaking like a fairground ride at the moment !
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My Name: Ozvtr

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Posts: 957
Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Misfire is typically related to plugs/coil pack. Clicking might be spark discharge.
Pull coil pack and plugs out. Check ceramic insulator on plug for oil or moisture. Check plug gap for build up or excessive ware/gap. Check rubber boots on coil pack. Should be flexible not carbonized.
Run the car at night in the dark. Look for eronius spark or corona discharge on outside of coil pack.
My Name: Neilcmusic1

Experienced Member
Posts: 57
Joined: Sun Feb 02, 2020 7:16 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.6
Fuel Type: Petrol
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Has thanked: 1 time
Been thanked: 6 times

Post

All sorted it was the coil pack , new one cost £75 and literally took 15 minutes to change , bought it from Eurocarparts , now runs great and mpg seems a lot better ,thanks for all of your help
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