Just bought a 00 Z28 A4 (2.73) 23K miles with custom fabricated Flowmaster exhaust, LS1 Motorsports Lid and aftermarket MAF housing.

When in gear at a stoplight it idles at around 500 RPM
(actually towards the bottom of the 500 RPM mark so maybe 480 RPM or something) Is this normal??

The car does'nt hesitate, surge or do anything like that and runs strong. My old LT1 always idled in gear at around 600-700 RPM. If the idle is indeed low for an LS1, could it be the larger MAF housing causing this?

Thanks.

 

thats fine

autos are like that

 

yeah mine idles low too, its fine.

 

Thanks for the help, I'm glad to know that there's nothing wrong. I'm not very familiar with the LS1 motor but it just seemed like most other cars I've ever driven always idle higher when in gear at a stoplight.
Thanks for the help.

 

I idle at 600RPM, but it doesnt sound like a major problem to be idling at 350-400 RPM

 

yes most do....but not the ls1