2003 Hyundai Elantra idle speed?

[Stelth]

I just took my daughter's car for a couple of little test drives after replacing the head gasket, and it runs really well, but it idles at about 500 rpm. I'm thinking that that's a little bit low. What should the idle speed be?

 

[Quest]

Typically, gasoline engines idle around 750rpm when engine is in normal operating temp.

Q.

 

[Brons2]

2.0 CVVT engine?

 

[oilmaven]

I don't believe the Elantra engine had VVT until the 2004 model year.

 

[cmf]

Idle speed (RPM):

700 ± 100 (A/C OFF)
750 ± 100 (A/C ON)

Source: 2003 Hyundai Elantra owner manual.

Did you disconnect the battery and leave it for ~10 minutes to reset the computer?

 

[mechtech2]

The speed may come up with a little time.
Also clean the throttle body real nice and the idle air control valve.
Everything hooked up, BTW? No vacuum leaks? Lots of places to leak!

 

[The_Eric]

Are you using the tach or a scan tool to observe RPM? My tach reads 550-600 at idle, but the scan tool reads 7 and change...

edit: Car is 2001 Elantra.