Hello,
Sometimes, the internal combustion engine (ICE) of my 2022 DS-7 E-Tense starts shaking immediately after full acceleration.
At times, the shaking gradually subsides after a few seconds, but other times it doesn’t.
This phenomenon is sometimes accompanied by the engine self-diagnostic light flashing for a few seconds.
I turn off the combustion engine and drive in electric mode for a few minutes; upon restarting, the combustion engine no longer shakes.
The first culprit that came to mind was the spark plugs, but they should still be good for at least another 10,000 km (the last service was done a month ago).
The manual states that this engine self-diagnostic light flashing requires contacting a dealer or a qualified workshop.
I would like to know what kind of fault to expect before taking the car to the dealership.
Please excuse any phrasing errors; English is not my first language.
It does sound like a misfire of some type.
Spar plugs, leads, coil pack, fuel injector fault, fuel starvation.
I would have the car checked for error codes.
@Jactac,
Thanks for the reply.
Manual vehicle test (accessed via the “Check/Diagnostic” button in the Driving/Vehicle touch screen menu) does not indicate errors.
Probably, this self Manual test is not enough.
I dont trust the onboard diagnostic tool.
Recently my car had the engine management light on for a full 3 days , yet the diagnostic tool says no faults found.
Clearly , if the car has sensed an issue and puts up the engine management warning icon, then surely the diagnostic tool must record this fault.
I’m scheduling an appointment for testing (and, if necessary, repairs) and I’ll get back to you.
A funny thing: since I started this thread, even though I’ve pushed hard the car a few times, the issue hasn’t recurred; like it got scared…
The engine management light came on and stayed on for 3 days on my car, then as soon as I contacted the dealership to get it checked out the light went off and has stayed off.
Maybe the dealership can do things remotely just to wind the driver up 
The scan revealed the two warnings (engine self-diagnostic light flashing) I mentioned.
Verdict: the spark plugs (specifically, two of them).
After replacing them, everything is fine… and smooth.
@Jactac , Thanks one more time.
These spark plugs are replaced every 50,000 km (30,000 miles). What is your mileage?
Yesterday, when (all) spark plugs were replaced, 153000km
If those were the original spark plugs, that happened a bit late.
I think that in the E-Tense, the latest it should happen is around the 100k km mark—so roughly 60k miles.
I am the second owner.
The service log covering the period before I bought the car is brief and only indicates that routine maintenance was performed.
However, the dealership service center told me that the spark plugs are not the original ones.
And, if I may, I would like to explain what happened:
As I mentioned, the issue occurred only after a hard acceleration, when the fuel mixture was rich.
It only took one spark plug failing to fire for the corresponding cylinder to flood and the engine to start shaking; though it would recover on its own after a few seconds.
But when two spark plugs stopped working, the engine wouldn’t recover (forcing me to eventually shut it off); meantime, in this situation, a larger amount of unburnt mixture was reaching the catalytic converter via the exhaust, which triggered the warning lights and error code.
At least, that is the explanation I was given, and it seems logical.