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Help, Rb26 Sounds Like A Wrx

autechwgn

By autechwgn,
in Engines & Forced Induction

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autechwgn Apprentice

autechwgn

Posted
Posted

Hi guys and girls, anyone have any ideas what could be causing my stagea to run rough? Sounds like it's running on 5 but tacho says it idles steady, it still makes boost but slowly, feels like it goes good once the boost kicks in. Just changed the plugs and coilpacks and all the plugs look the same, no fouling etc. Wondering if it could be fuel filter or boost leak or afms, or fpr? Just had fuel pump done too. Also has a bit of backfire on gear changes

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Ben C34 Grand Master

Ben C34

Posted
Posted

Just because the tacho is stable doesn't rule out a cylinder missing. With car running disconnect one coil pack at a time, in no time you will know which pack/plug/part of loom is dodgy

  • 1 month later...
autechwgn Apprentice

autechwgn

Posted
  • Author
Posted

Ok guys, replaced the plugs, replaced the packs with splitfires and just put in a new coilpack loom, still sounds like it's missing and smells rich plus is very laggy and won't make full boost, could it be an injector?

Ben C34 Grand Master

Ben C34

Posted
Posted

Just because the tacho is stable doesn't rule out a cylinder missing. With car running disconnect one coil pack at a time, in no time you will know which pack/plug/part of loom is dodgy

Did you do this? Or just replaced stuff for fun? Narrowing it down to a cylinder would have helped you determine if it was a coil pretty easily.
autechwgn Apprentice

autechwgn

Posted
  • Author
Posted

I replaced things that seem to cause common problems so I don't have to worry about it again for a while. It used to come and go so I had ruled out mechanical problems as I would think damaged piston or cylinder would be more permanent.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

If it is intermittent there is a good chance one or both of the AFM's needs re-soldering, there is a 'how to' around on fixing them if you do a search.

It could be an injector too, would be a good idea to get them cleaned and flow tested just to rule them out.

Ben C34 Grand Master

Ben C34

Posted
Posted

I was just pointing out that trying to diagnose such problems over the net is near futile. It always turns out to be something either very obvious or nothing that anyone thought of.

So tempted to put that in my signature.
  • Like 1
autechwgn Apprentice

autechwgn

Posted
  • Author
Posted

When I bought it they did a compression test and has only done about 5000k since then so no I haven't plus cause it was come and go I didn't think it could be that. Happened around when the alarm went in, imobiliser issue maybe?

Even_Flow Enthusiast

Even_Flow

Posted
Posted (edited)

Wouldn't surprise me if its an afm.

Another quick thing to do would be check over all of the I/C piping and joiners for a leak and vacuum lines too

Edited by Even_Flow
Rolls Grand Master

Rolls

Posted
Posted

Pull injector plugs one by one until one doesn't make it any worse than it is already. Once you find the cylinder that is missing check the plugs/coils/loom for that cylinder.

Could even use a screwdriver to the ear to find which one is missing.

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