I have had my 2004 coupe with auto trans for 3 years now. I continue to have an issue with low idle. When I first start the car it idles at 700rpm. After it warms up, it drops to 500 rpm and feels like it will stall at stop lights. It never does stall. Is this normal? I have had my mechanic check for vacuum leaks and none found. I have also done the following over the past 3 summers:

New : spark plugs, fuel filter, air filter, crankshaft position sensor, MAF cleaned, throttle body cleaned, no engine codes, new battery.

Any suggestions or is this idle normal?

Thanks

 

Is that 500 in drive?
I think mine is a little above that, maybe 600 in D.

 

yes 500 in drive. It makes the car shake when it idles that low. Feels like it is going to stall but never does. Does your car feel that way?

 

Mine idles at ~500 all day long. My car is a 6 speed though, so its going to be able to idle lower than an auto trans car. I don't know what autos are supposed to idle at. Does it mention anything on the emissions tag under the hood?

 

Is it a smooth idle or rough? The main issue for me is that it is a rough idle

 

Have you had any tunes installed? Is that with the A/C on?

 

A/C on, but it is almost exactly the same with it off. I apologize, what do you mean by tunes?

 

Car tuned by Eurocharged or another vendor (for more HP). I have noticed that my idle RPMs are a little bit lower while in D after the tune.

 

Its relatively smooth. I can feel a slight hiccup every now and then, but otherwise quite smooth.

 

Finally took note on mine today and after warm up, A/C on, in drive, idle is at the first full line above zero on the tach which I think is 500 RPM - but idle is very smooth.

 

Maybe it is motor or trans mount wore out.

 

My 2005 roadster has the same problem with low idle when I start the car the idle is 750. Once I put it indri either drops to 550. Some times at a light the car will stall. I had all the plugs,wire and filters changed and still have the problem. WHY????

 

Have you checked for a vacuum leak?