Merry Christmas guys!

Have a couple hundred miles on a my24. When i startup cold, the car shakes and revs 1500 RPMs for about 10 seconds. Known/common issue? Am I screwed? Lol thanks.

 

No warning lights?

ls it very cold where you are?

 

No engine lights on. In NY so weather has been 30s-40s.

 

Merry Christmas!
Is it the air-suspension? I have that, and on certain days it starts with very high revs for about 10-15secs, then back down to 1000 normal revs.

 

Nah I’m on coils, but interesting since the issue sounds the same. Thanks!

 

So let's dig deeper.

Cold start, or at least not been running for 20 or so minutes?

Vehicle starts, then high idles at 1500.

While high idling you are feeling a couple "bumps" in the RPMs?

Then after maybe 30 seconds the idle drops to normal?

If so.. that's exactly how my P300 acts. It's the compressors and accessories turning on that you are feeling. I can almost count the the times it bumps like that, usually it's three times.

If you put the vehicle in gear while it's high idling it will slow the idle and engage the transmission.

I leave mine to settle down figuring some egghead programmed it for a reason.

Now if I'm wrong about those assumptions above I don't know. I just know that what I described made me go Hmmmm when I bought it, but it only took a few days to realize it's normal.

 

It's normal. If you don't like it put it direct after start in drive. That regulate the revs to normal idle.
Drive it in good health.

 

This is literally how it plays out, exactly. Thanks all, I feel relived haha.

 

Mine is the same also, P300 here. I first thought it was odd when it was new, now I'm used to it.

 

Normal. When I tuned my own EFI system for karting this was called warmup enrichment. Higher revs and richer AFRs to warm the engine. Probably does many other things in a vehicle like build oil pressure, start recharging the battery after starting, etc.