Excelerate

iTrader: (1)

I have an '01 CL-S and for the last couple months my RPM's will drop at idle to about 450-500 and stay there until I actually hit the gas. Sometimes after a hard run the idle will drop to almost 250 and then pick back up. I tried putting the A/C on to see if it would raise the idle and it didn't. Also, I am not throwing a code so I doubt it's the TPS. I have checked the voltage of the battery with the car not running (12.8 volts) and the car idling (14.5 volts) and it's perfect. I cannot figure out what this is. Any help would be appreciated.

Josh
Excelerate LLC

fuzzy02CLS

iTrader: (2)

Dirty IAC valve. It's on the side of the TB, run some some carb cleaner in it. Or take it off & use a Q-tip & some compressed air.

Excelerate

iTrader: (1)

Yea, I've done this before, a few months ago. I didn't think it would get dirty that quick.

phipark

Fuel pump My was doing this, but only in cold weather. it's stopped since it's gotten warmer.

dgracer

I think at 12.8v your battery is a little low. Should be 13.4v with motor off and a full charge. If you are still on your original battery, you've got to be due. Mine started cranking a little slower in the morning and I noticed a slightly rougher idle. I was also only getting 13.0 v at rest and decided to change it. What a difference it made. Mine was almost 5 yrs old and had 76k mostly fwy miles on it.

fuzzy02CLS

iTrader: (2)

oh.........in that case

koolmonkey999

I had the same exact problem where if i just pushed the gas during idol the rpm would drop down and nearly stall below 800 rpm. I recently changed my filter on my intake and after that i never had that problem. So IMO change your filter? I had my old filter on for about 20k+ miles before i changed it.

Excelerate

iTrader: (1)

The voltage is fine. I confirmed this with my Interstate rep. I really wish it was the battery b/c I figured I was due since the car is 4 years old and has 60k on it.

Josh
Excelerate LLC