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718 GT4 hesitation on initial acceleration

F

Freakuk

PCGB Member
Member
Hi all,

I have owned my GT4 for a few months now, it's a late 2020 car and has just ticked over 6K miles. I am also in the well known club of a PADM failure which will hopefully be fixed this week as the parts are now in-stock at my local OPC.

However, that aside I have noticed another slight issue. When I press the accelerator the car stutters for a split second and then pulls cleanly all the way through the revs, you don't notice this when moving much, but moving off in 1st gear it's easy to hear/feel. Likewise if I rev the car in neutral it happens consistently wheher that be a gentle tap or throttle or a decent whack of the loud pedal.

Anyway, as it's going in for the PADM I thought I would ask and see if anyone has any ideas so I can pick up with the OPC at drop off.
 
Slipping clutch or faulty coil(s) would be my first guess. Neither would give a CEL unless the coil(s) are causing an obvious misfire.

Other than that, if it's only first gear, there's the anti-stall process that might be playing up?
 
Hi Jon,

From your description it sounds as though the problem could be linked either to the throttle pedal or the throttle actuator itself, but who knows with all the interlinked electrical complexity in these cars?

If you mention it to the Porsche Centre when the car’s in for its gearbox mount replacement they’ll run some diagnostics to see if any error codes are flagged-up.

Jeff
 
Twinfan said:
Slipping clutch or faulty coil(s) would be my first guess. Neither would give a CEL unless the coil(s) are causing an obvious misfire.

Other than that, if it's only first gear, there's the anti-stall process that might be playing up?
Click to expand...

Good shout on coil packs. Also car must be coming due for new spark plugs soon… although that change is more about them not getting seized in the heads rather than actually needing a change.
Also what fuel are you using?
 
Well it's in at the OPC today for the gearbox mount failure, I've asked them to have a look so will report back.

I did think coils also, fuel wise always 98RON, BP ultimate usually as that's the closest garage.
 
It would be very disappointing if a coil-pack has only lasted 3-years/6k miles Jon, but they’re a very vulnerable component on the boxer engines.

The 4.0L engines have partial cylinder deactivation at certain throttle openings/load conditions, so maybe that’s in the mix? Whatever, it will be interesting to hear your update.

Jeff
 
UPDATE

Sorry it's taken a few days to provide an update as I've been in the city.

So the gearbox mount was replaced and low and behold the stutter/hesitation has gone as the OPC suspected. There were some SW updates and a recall apparently so maybe there was something in there also? They didn't provide details unfortunately.

However, being a GT car it has to go back for a free 4 wheel alignment post PADM replacement. I'm not sure if they forgot to do it or they were informed once they were processing the warranty claim. Either way it's a tad annoying as it's another trip back, but I do get to look a shiny cars :)
 
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