Good Morning Scotty
I have a 2009 Sante Fe with 185,000km. just recently upon starting my vehicle in the cold, the idling RPMS are now at 1500 RMPS, which is high. It normally idles at 1000 RPMS or just below.
After driving for a short period of time when the vehicle has warmed up, I would then turn it off and then re-start the vehicle the idling does not increase anymore, the idling RPMS is back to which it normally was, which is about 1000 RMPS or just below.
Spark Plugs were changed at 100,000km, along with the water pump and timing belt.
What can be the cause to the increase in RMPS upon cold start?
Love your show, keep up the great work Scotty.
Thank you
This is completely normal. The computer is reading a cold engine, enrichening the air/fuel mixture through the 02 sensors and kicking up the idle rpm to compensate.
Awesome, appreciate your advice.
That sounds normal for a cold start in cold weather. My owner's manual says the following:
STARTING A GASOLINE
ENGINE
When you start the engine, the idle speed
increases. This helps to warm up the
engine. If the engine idle speed does not
slow down automatically, have your
vehicle checked by an authorized dealer
Yours probably says something similar. The length of time to idle down varies depending on how cold it is. And don't see a dealer. That part is bad advice. {pear}:wink:
Thanks again everyone, I appreciate your response
The extra fuel helps the engine start faster. But we also do not want the fuel-air mixture to be too rich. So, the throttle valve opens to raise the engine's idle speed. That's why you see the engine idling at 1500rpm or even higher.
I really appreciate the informative responses.
Thank you