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Misfire at constant rpm

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Hi guys, my car has developed a misfire over the last few days, first started doing it in 3rd/4th going around 25-30 but it now does it in all gears where my revs have been sat at a certain for a length of time.

I'm gonna pull the plugs to check those out and I've got a old spare set I can put in to see if it changes anything. Next thing would be coilpacks right?

What's the best aftermarket coils I can get without spending big money?

Thanks, Leo


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Could be a range of different things, Try the paperclip trick to read for codes.

I've got a set of OEM coils off my car that are fine, I upgraded to Splitfire when I had a misfire issue, turns out my packs were fine and it was a spark plug issue.

If you think its your plug and you'd like them drop me a message, Coils are a common failure on these cars.
 
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Check the plugs, I had a loose one which gave an intermittent miss until it fired the plug out of the head through my airbrushed cover :(

coilpacks normally miss miss as soon as the boost kicks in at about 3k rpm and make the car sound like an Impreza
 
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Check the plugs, I had a loose one which gave an intermittent miss until it fired the plug out of the head through my airbrushed cover :(

coilpacks normally miss miss as soon as the boost kicks in at about 3k rpm and make the car sound like an Impreza
 
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Yeah I'll check the plugs when I get in.

Are there any risks in doing the paper clip trick for codes? I don't wanna ruin my ecu


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No its fine! just make sure you bridge the correct 2! I had to do it a couple of weeks ago, Its fairly easy.

Because of the shape on the OBD port you can't really get it wrong.

:) but definitely check plugs as its likely either that or coils.
 
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I did the paper clip trick earlier and got fault code #55 which is 'no fault'

Soon as I get time I'll pull the plugs out but could the fact there's no fault code point towards bad fuel? I use tesco 99 and never had any issues


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S15_SAM

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I had a very light misfire on partial throttle, cruising along at a constant speed. It was my air flow meter.

A faulty Coil pack are normally shown at full throttle, coming onto boost.
 
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Spent some time on it yesterday:

Checked plug condition and gaps, checked for crap on maf sensor, changed fuel filter and put shell nitro + in instead of tesco 99. The problem seams to have gone so I'm assuming it's the fuel.

It's already got splitfire coils so good job I didn't order a set


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