MK5 GTI shuddering

[VW]

Hi all, I took my MK5 GTI for a drive today and it started shuddering after about 5 minutes of driving, I slowed down and dropped into a lower gear but it was still shuddering and felt like it was going to stall. I pulled over and stopped and the car was still shuddering quite a bit at idle with the engine light flashing. The car has had a constant engine light with fault code P000A: camshaft positioned bank 1 slow response, not a plausible signal which my garage couldn't resolve even after stripping the engine apart but seemed to drive fine with it until now (it's been around 7 months). Just wondering if anyone has had any similar experiences/resolutions and costs...

[TheBALDpuma]

Flashing EML means you've got a misfire. Will be plugs, coils or injectors. Injectors are common failures on these, coils go too and so will plugs if you don't change them on correct intervals.

[VW]

I've had the coil packs and spark plugs changed as I did a major service about 9 months ago so I didn't think they would go out this quick

[TheBALDpuma]

Probably an injector then! I've had 2 of mine go since I had the car.

[VW]

Sounds like it, thank you! Do you know roughly how much replacing that would cost?

[TheBALDpuma]

It isn't cheap. It's a big job with labour and I think the injectors are nearly £200 each.

I think it cost me about £400 all in.

If you have the money it's worth getting all four done to save paying the labour cost multiple times, but it is expensive to change £600 extra worth of injectors that don't need doing yet. But they will go at some point. I didn't do this though, but know I will regret it when the next one goes.

[mjmallia]

That or excessive carbon fouling can cause misfires.......either way the intake mani needs to come off to inspect that or the injectors.