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Here's a video: https://youtu.be/wYyaW9wRt6U

For a couple of months now my car has had a rough idle and shudders while accelerating - Vauxhall Astra J Exclusiv MK6, 4 years old 61k miles spark plugs done last year.

It starts off shuddering if I accelerate from too high of a gear (low RPMs) and then it progressively gets worse and happens even when in mid-high RPMs to the point where I would be on motorway at a steady 70 mph and still feel faint shudders. I guess as the car gets warmer it just gets much more noticeable.

A colleague told me to the clean throttle body which I did. I didn't notice any huge deposits just some oily grime around the walls and butterfly valve. Unfortunately cleaning this made no difference.

A local garage said they couldn't find the problem and advised me to go Vauxhall dealership which I want to avoid for now.

What's changed since a couple of months ago? I serviced the car myself (air + cabin filters and oil) in September.

For all you mechanically minded people out there, I would appreciate some things I could look into!

Edit:

OBD trouble code P0301. Which for the "GM" section shows quite a long list of troubles. The problem has worsened over last 48 hours, it is idling is now very rough even from cold and with emissions control system (flashing amber) + electronic stability control (constant amber) on dashboard. Is there something here where I can read between the lines to remedy from home?

codaamok
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I don't know that particular car well, but maybe a vacuum leak? Perhaps it's at the intake manifold, and worsening as the parts warm up, expand, and mating surfaces change shape?

Cliff
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I can't quite hear the clicking properly but check your ignition leads.. If I'm hearing right it sounds like a plug lead or coil pack is arcing somewhere and its timed with the uneven idle too. Have a look around the ignition leads & spark plug areas if possible in the dark, you may be able to see arcing somewhere if that's what it is.

You'll likely be better guided once you receive the OBD tool & can read the codes, assuming the miss has been picked up buy the sensors.

EDIT... So the OBD tool has pointed towards a cylinder 1 misfire (P030'1')

I think just to rule out anything major I would be doing a compression check next on that cylinder, although a check on all cylinder pressures would be good practice. If cylinder pressures are ok, then I would still be considering the ignition system, especially as you suggest the issue seems to get worse as the engine warms up and is put under load. A plug, coil pack etc would exhibit this behaviour. Although there is always the chance of an electrical fault or ECM issue before these points.

Going forward I would perhaps advise that if you are not particularly versed in testing procedures etc that you perhaps consider whether or not to let a diagnostics technician or main dealer take a look at this fault. I only say that as... We will all try to guide you but at the end of the day these issues need fixing sooner rather than later, especially if you're using the vehicle. As depending on the misfire rate and driving conditions etc, un-burnt fuel from the misfire actually gets into the exhaust and can damage the catalytic converter too which would be more cost. This is born out by the now displayed emissions control warning lamp.

At least if you opt to have an experienced dealer technician look at the car he will have access to far better diagnostic equipment & parts too. Plus may have even experienced the same thing on the same model before so knows the signs. Although cost is always a factor here, a speedy repair may save you money overall.

Orb
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Hi I had the same problem vehicle shutters when warm up answer is replace plugs and coil pack and faulty injectot cost around 145. 00 for all put iridium plugs better firing plug and your problem will disappear good luck easy to do

John
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