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BigJimnyMeet (North) 2024 (12 Jan 2024)


BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

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Cylinder 2 misfire cold start

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20 Nov 2023 19:34 #252245 by Dimitris
Hello
I got a Jimny 2005 and I have an issue. When the weather is cold the car in the morning starts easily but its not sounds well. If i press the gas pedal between 1500 and 2000 rpm the engine light is blinking. If the car get warm then it works just fine. The scanner shows the error "misfire cylinder 2". Does anyone experienced something similar?
I must say that I have already replace spark plugs and coils.

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  • DrRobin
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20 Nov 2023 23:47 #252252 by DrRobin
What did the old plugs look like? Was the plug from cylinder 2 a different colour to the others?

2011 Blue Jimny SZ4 morphing in to a 2020 SZ5 in the next week or so.

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21 Nov 2023 12:57 #252265 by Dimitris
I am not sure about the colour. I thought about the injector on cylinder 2 but it works good when it's warm. What sensor finds the misfire on cylinder?

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21 Nov 2023 13:24 #252267 by DrRobin
Misfire is usually detected by the crank position sensor, it expects to see the 'kick' in rotational speed for each firing and if it doesn't it knows it was a misfire. It then uses the crank position vs the spark plug firing to know which cylinder didn't fire.

The reason for asking about colour was looking for cylinder head gasket, rings, or a sticking valve, but if it runs fine when warm you might not notice any difference in plug colour.

It could be a faulty injector, that works well enough when warm but is sluggish when cold.

I take it you battery is well charged?

Robin

2011 Blue Jimny SZ4 morphing in to a 2020 SZ5 in the next week or so.

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21 Nov 2023 13:52 #252271 by rogerzilla
The crank position sensors are a known point of failure, snd fairly cheap and easy to replace.
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21 Nov 2023 14:33 #252274 by Dimitris
The battery is new. I will start withe the injector and then the crank position sensors
Thanks a lot

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21 Nov 2023 19:44 #252279 by DrRobin
I doubt it’s the crank position sensor, a faulty one wouldn’t give a misfire on cylinder 2 only, it’s would be on different cylinders.

If it is only on cylinder 2 then it is going to be something specific to cylinder 2. You have changed plugs and coils, so an injector is the next thing, unless there is something more seriously wrong with cylinder 2.

2011 Blue Jimny SZ4 morphing in to a 2020 SZ5 in the next week or so.
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21 Nov 2023 20:22 #252281 by Phaeton
Swap the plug, injector & coilpack from No 2 with another cylinder & see if fault follows, if it does you're down to the 3 items, if it doesn't it could well be mechanical.

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21 Nov 2023 21:02 #252282 by facade
Do a compression test when cold and see if cylinder #2 is lower than the others.

A burnt exhaust valve will cause enough compression loss for a missfire at idle, but seem to get better when the engine is running at speed.

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)

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