ccassel4

I have a 2002 trans am ws6.

The engine seems to idle down very slowly compared to say a carb motor. Plus sometimes the idle seems just higher than normal.

Is this normal for an LS1? Is there an adjustment or something that can be done?

Thanks!

CaMaRo67RS355

iTrader: (75)

when its cold ofcourse it will idle higher then idle down lower. whats the tach say? does it have a tough time cranking up? what mods does it have?

jmm98LS1

iTrader: (28)

Welcome to fuel injection. It takes some major tuning with software to get fuel injection to have the throttle response a carb has. Don't pay too much attention to your tach, most are off a ways from the factory. Mine reads 1100 when I'm idling at 850.

ccassel4

This is when the engine is warm.

When reved the engine takes longer than usual to come down in idle. Is anyone here qualified to answer this question, for example has had this problem or is a mechanic?

Everything on the car is stock except the exhaust.

8a8mfh

iTrader: (3)

Yea there are plenty of people here qualififed to look at your car and tell you if it's normal. But the way you're asking the question might confuse the whole team that designed the LS1.

You say it takes longer than usual. OK whats usual TO YOU?

Is usual what it used to idle like?
Is usual what your friends LS1 idles like?
OR
Is usual what a different vehicle idles like?

As I said about anyone here can tell you if it's normal by having the car present, so can you at least put up a video clip, or do we have to keep guessing?

LrngCrv

Your idle is controlled by tables on your computer. The main table has it change with engine temperature. But A/C, battery power getting low and many other factors can change what the computer decides to make the car idle at. Everything you said in your first post is completely normal.

RPM WS6

iTrader: (3)

"Usual" will be slightly different for every car. I find that my LS1 cars tend to idle down a bit slower than other SFI engines I've owned. But is yours "normal"? Really, nobody can tell you that without seeing/hearing the car.

Spink

iTrader: (1)

High idle is usually a vacuum leak. You could try spraying some intake cleaner around all your vacuum lines and see if it causes the car to surge at all. If it does you found your leak.

I had that problem on my 96 Maxima and that's how I found it. I had the intake off to clean out the IAC valve and when I put everything back together one split on the bottom and I couldn't see it.