TobiasBB said:

So, I was speeding a little bit in my 04' Climbing, and the little orange motor-light came on twice... at home i popped in my reader giving the two codes p0300 and p03002, which after a bit of googling tells me Ill need new ignition cables and/or sparkplugs, Ill swap those after work tomorrow.. but the smell of the exhaust and lag of power plus high fuel consumption indicate it might be the catalytic converter.. So with my recent luck im expecting to exchange the cat (Im thinking sports catalytic converter), and while im there ill exchange the pipe to the backbox, and that leads me to the real question; anybody on here tried the dual exhaust backbox from ulter on the climbing? Any drawbacks? Anything I should be careful of? I've never changed an exhaust before...

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Goudrons said:

P0300 is a random misfire code.
P0302 is a misfire on cylinder 3.

It's not uncommon to get multiply codes of this sort, the ECU detects a misfire or two and flags the P0300, then detects repeated misfires from pot 3 so you now get P0303.
(I don't know if P03002 is a mistype?)

There have been a few of these type of faults reported on here, but they don't all have the same sources.
Ignition and fueling are prime suspects.

Though a mechanical fault such as a head gasket leak or and ECU/wiring fault isn't out of the question.

The loom in the Active models do seem to have a fault with a wiring connection that causes the same problems, might be worth a look on here as someone did find and fix theirs.

You can, with a bit of logic narrow things down a bit if you have the time and patience.

Moving parts from one cylinder to another, one at at time may help.
If the problem moves with that part, there's your culprit.

Start with plugs and leads, then coil packs and injectors.
I'm pretty sure the up and down stream O2 sensors are the same part, if might be worth swapping them before giving up, a duff up stream can cause an overly rich mixture and misfires, but it'll read like this on a diagnostic tool anyway if you have an ignition/fueling fault.

I suspect it maybe just a failing coil pack though.

Don't read too much into the exhaust smell being a knackered cat, unburnt fuel and air is passing through it, so the cat won't work properly due to the cooling effect of the unburnt fuel/air.

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TobiasBB said:

Apparantly it did not solve the issue... it happened again today, but only at 110kph, which could indicate fuel-starvation in that cylinder? Im thinking Ill clean/replace the injector (I have some extra lying in a box).. is that a sensible way to adress the problem?

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DaveMcT said:

Ive had coil packs break down gradually and cause all sorts of issues including sooty plugs. These are wasted spark coils firing two plugs at the same time. A weak coil will favour one plug.

Swap the coil connections at the low tension (trigger) side and plug leads to the other plug pair. If the misfire moves you have the culprit.

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TobiasBB said:

I'm sure I have some lying around here somewhere, (they might be stuck on an old motor..) but hopefully no corossion, so ill swap those while doing the injector, it wont tell me what was the issue but it will take care of all the things that has been suggested..

What side does the ECU count from? Which is cylinder 1? And which is 4? I think i remember to have read somewhere the waterpump end should be the first, but I'm unsure..

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