high idle speed on 99 SS
#1
high idle speed on 99 SS
As the title says. high idle speed on 99 SS ive changed the ICV and have replaced all tubing with pcv. Exept the port in the manifold( little plastic nipple in the rear). Any ideas to why i would have a high idle. Also it does not like to idle down when i pull it out of gear while goin down the road. Kinda scratchin my head on this one
#6
ive scanned it for codes and it comes up with a high idle speed code once in awhile. the only other vac tubes or spots it could leak is the rear manifold nipple and the TB gasket. Ive changed every other vac tube. Also ive changed the PCV and the icv. It does sound like a vac leak to me. But i cannot find it for sum reason. It is starting to really **** me off LOL. It also could be a bad MAP sensor or bad MAF. Am i correct on this???? I still think its a vac leak sumwhere tho. It idles at about 1000 and when i pull it out of gear while goin down the road it stays at 1500 till i completly stop.
#8
There is a procedure for resetting the iac(idle air control)valve for a LT-1 but dont know if it works on LS-1.
.Depress accelerator slightly
.Start engine,then release accelerator pedal,run engine for 5 seconds
.Turn engine "OFF" for 10 seconds
.Restart engine and check for proper idle operation
.Depress accelerator slightly
.Start engine,then release accelerator pedal,run engine for 5 seconds
.Turn engine "OFF" for 10 seconds
.Restart engine and check for proper idle operation
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