Hi there, ive got a problem with my 1.4T that I cant get my head around!

Starts fine, but when i pull off and start driving it:
- sounds like its running on 3 cylinders
- idles rough when i pull up
- hardly any power when accelerating


Ive replaced the coil pack and the spark plugs but still no joy. Cant find any obvious vaccum leak either! Its driving me nuts anybody have an idea?

Hi, just hoping someone has any thoughts on a rough running issue. The car is a 2015 Astra J GTC SRI with the 2.0 diesel (A 20 DTH). Everything was fine before the last service 3 weeks ago, since the service the idle from cold start is rough with fluctuations of 50-100 rpm and when it's particularly bad there is a knock from the engine almost as though the timing is being advanced.

[color=#333333]The issue is at it's worst in hot weather but can occur at any time from a

Hey guys,

Noticed something alittle odd on my 1.7 Astra GTC 62 plate.

I was letting the car idle stationary and was hold the revs at certain ranged.to get the engine warmed up.

I noticed when the rev counter hit approx 1500rpm - 2000rpm I could feelnthe car shaking abit, but then below or above the rev range it would smooth out and be completely normal?

Any ideas on what it could be?

Thanks in advance.

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Hi,

For the 2nd time now I have encountered the same issue.
My car doesn't get used much for long trips nowadays but I encountered this problem on his last long trip a week ago and one month ago:

Car driving fine, full power no error messages.
Suddenly no power when pushing gas pedal, car begins to stutter instead. But still runs in idle. Engine light comes on.
This problem gets worse over the next seconds until the car runs so rough in idle it stalls.
Restarting the car goes suuper ro