DdotSdot

I own a 2010 IS250 with a little over 100k miles and my car just recently began to turn over slow when I start it and the idle bounces from 500- 700 rmps when I stop at a light. Im not sure what the problem is, if you could help that would be appreciated.

Zmon

iTrader: (2)

Did you get your battery and alternator tested?

Could also be carbon build up, but I don't think that's the cause of the slow start, but it could be the cause of the idle jumping at a stop.

2013FSport

iTrader: (2)

By turn over slow, like when cranking, it sounds different and the tachometer reads lower?

As stated below, could be two things or it could be just carbon buildup. Read below and do a search here our anywhere on carbon build up in direct injection engines. Carbon causes what you describe about your idle quality.

^^ +10

OP could start with a basic tune up, air filter, MAF cleaning, plugs. While the intake is off for plugs, look for carbon deposits and decide what to do then.

Hint - look up shops that do walnut blasting.

DdotSdot

Thank you, I just changed the battery and it idles better but sometimes the rpms drop while Im stopped. Im going to go get the alternator tested today.