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'54 Plate Ford KA - Cylinder 2 Misfire

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Old Dec 29, 2014 | 09:10 PM
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Default '54 Plate Ford KA - Cylinder 2 Misfire

Hi guys,

So, I'm a new driver. I've been driving now for about 2 weeks. I found this car a while back, a lovely '54 plate Ford KA Luxury, with only 47000 miles on, that needed a bit of TLC. I can't argue for the price I paid. I spent a little bit of extra money on getting some new tires, new bulbs, fixing a little bit of natural KA rust, and getting a new bush for the offside suspension.

From when I got it, the car was running great. No problems what-so-ever. Until a couple of days ago, that is. My car started struggling, it was drinking fuel like it's the cheapest thing on the planet and the engine maintenance light came on, so I got my uncle to look at it for me. He got this little device thing, plugged it into some compartment I never knew was there, pushed some buttons and hey, what d'ya know, misfire on cylinder 2. He said that some new spark plugs and some new ignition leads should fix it, as they looked like they were the originals that came with the car. I went out and bought what he said and he fitted them for me and the car felt better instantly. Until about 10-15 minutes later when the car started struggling, the engine light came on again, etc.

So, now I was back to square one, £20 down, too. He then said that it MIGHT be the coil pack (He used a hell of a lot of emphasis on the might part) and I should get one and he'll fit it. But, I want to make sure it's definitely that this time, so I don't go out and spend more money on a part that won't fit the problem. Is it possible that it could be something else? A fuel tank problem, maybe? I don't know, I'm not a car expert.

TL;DR - My Ford KA is struggling and guzzling fuel. I found out it was a misfire in cylinder 2. I replaced the spark plugs and the ignition leads but it's not fixed the problem. I've been told a coil pack, but could it be something else?

Thanks guys

Ollie
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Old Dec 29, 2014 | 09:22 PM
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It may well be a coil pack as these are prone to failure on modern cars.

However, the fact it's misfiring on one cylinder would lead me to question this.

The coil is essentially a transformer, which is what generates the high voltage required to create the spark at the plugs, it's named so as it is two coils in one.

One for two cylinders, therefore in theory cylinder four should be misfiring as well.

It may be something mechanical on that cylinder that is causing the misfire, but you need tools to verify this.

Martin
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Old Dec 29, 2014 | 09:29 PM
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Originally Posted by martysmartie
It may well be a coil pack as these are prone to failure on modern cars.

However, the fact it's misfiring on one cylinder would lead me to question this.

The coil is essentially a transformer, which is what generates the high voltage required to create the spark at the plugs, it's named so as it is two coils in one.

One for two cylinders, therefore in theory cylinder four should be misfiring as well.

It may be something mechanical on that cylinder that is causing the misfire, but you need tools to verify this.

Martin
Do you think it would still be worth getting a new coil pack anyway as the car is 10 years old?
It saves taking apart the engine or whatever needs taking apart for now, too. The coil pack may fix it, right?

Last edited by OllieCockle; Dec 29, 2014 at 09:31 PM.
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Old Dec 29, 2014 | 09:39 PM
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It's up to you, I am not convinced if it is just that cylinder.

You wouldn't need to take the engine apart, but you would need tools to do mechanical diagnostics, i.e. compression.

Martin
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Old Dec 29, 2014 | 10:06 PM
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I'd rule out a fuel injector first by swapping it with say cylinder one and see if the misfire follows it, if it does then the injectors faulty, if it doesn't you know its ok. Then your down to coil pack or an engine issue, you can do a simple compression test by using the proper tools which should confirm a compression issue. How ever if I was you I would chuck a coil pack on it any way for 3 reasons. 1) they aren't that expensive so its not a lot of wasted money, 2) the coil pack sits right above the exhaust manifold which is why they are a common fault. 3) I have seen hundreds (probably an exaggeration)of cars with misfires on one cylinder caused by faulty packs.
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Old Dec 31, 2014 | 04:08 PM
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Common for them to just drop one cylinder when the coil pack fails. Also common for them to fault when they get hot. I'd say put one on and see if it fixes it....If it doesn't take it back. It won't get dirty being fitted.....so you can just say it didn't fit....or you didn't need it in the end or whatever.


Matt
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Old Dec 31, 2014 | 04:39 PM
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Originally Posted by martysmartie
It may well be a coil pack as these are prone to failure on modern cars.

However, the fact it's misfiring on one cylinder would lead me to question this.

The coil is essentially a transformer, which is what generates the high voltage required to create the spark at the plugs, it's named so as it is two coils in one.

One for two cylinders, therefore in theory cylinder four should be misfiring as well.

It may be something mechanical on that cylinder that is causing the misfire, but you need tools to verify this.

Martin
These regularly drop 1 cylinder on the coil pack, also 2 and 3 fire together not 2 and 4 as you suggest.
Cheers
Stu
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Old Jan 3, 2015 | 02:14 PM
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Default missfire

just fixed one of these[sportka]using the solus
missfire no 2[as well yes] moved the injector to no 1-cleared fault missfire was then no 1-so you then know its injector at fault[as described above]
i changed injector and all was fine-cleared codes etc

i have a few good injectors and injector harness for sportka here if you need such an item
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