ZeroGuardian

Hey Everyone,

Just wanted to run this by the folks here as this is my first AMG and wasn't sure if this is normal.

When I cold start my C43 it immediately goes to idling at about ~1400 RPM. If I then immediately put it in gear it drops down to around ~800RPM.

However, after I've driven it for a bit (not even fully warmed up) its idle goes down to the usual ~500-600 RPM. And it stays there until the car is fully cooled down again.

Is this something I should have checked out? Everything on the car has been running great. I have had no issues otherwise so I just wanted to get some opinions on this.

Thanks,
Zero

RDOCA

Sounds like it is working just as it should.

ZeroGuardian

Yeah I figured this may just be the engine idling higher due to the cold start temperature. But as I said, its my first AMG and wasn't sure. My last car wasn't a performance vehicle so it didn't vary the idle much between cold vs warm start.

OrientBlue3

Totally normal. Welcome to the DFW AMG family!

Mbm6f

My W204 did that. I never put it in gear until the RPMs dropped. I'm really **** about making sure my cars are warmed up.

bweinber

Yea, this is normal. Mine does the same thing. You get a higher RPM and fuel rich mixture to help have more complete combustion until everything warms up.

shadenfroh

It only lasts for a few seconds and the rpms drop - a quick initial warm up. I always wait for the drop (but no less then 10-15 seconds) to get everything nicely lubed up then I drive off gently.

Parth141

I might be wrong but I believe some newer cars have a higher start up idle for a few seconds in order to warm up the catalytic converter.

ZeroGuardian

Thanks for the replies everyone. Glad to know its normal and expected. Man do I love this car... I don't think I've smiled this much in ages.