Idle Problemo

[flyboyshell]

Hi Loren and guys,

I was wondering if anyone can help. My Porsche runs really well. However, while idling she seems to drop 650-600rpm every 2-3 seconds. Sounds like she is has a flat spot. Any suggestions on how to get her to idle constant?

[714dre]

Hi Loren and guys,

I was wondering if anyone can help. My Porsche runs really well. However, while idling she seems to drop 650-600rpm every 2-3 seconds. Sounds like she is has a flat spot. Any suggestions on how to get her to idle constant?

Sounds as though you need to clean the throttle body.

There is a DIY on this site...

Basically pull the airbox, and spray some carb cleaner in the throttle body and clean until everything is shiny inside... including the edges of the flapper itself

edit: found the thread.

http://www.renntech.org/forums/index.php?s...e+body+cleaning

easily accesible on the carrera, not sure on your car though.

good luck.

Edited March 25, 2009 by 714dre

[1schoir]

Hi Loren and guys,

I was wondering if anyone can help. My Porsche runs really well. However, while idling she seems to drop 650-600rpm every 2-3 seconds. Sounds like she is has a flat spot. Any suggestions on how to get her to idle constant?

flyboyshell:

Since your Boxster is a MY 00, it does not have an idle control valve. The idle is controlled electronically by movement of the throttle body butterfly valve.

Pull off the air intake at the throttle body and look for gummy deposits where the valve contacts the inside circumference of the throttle body. If you find deposits in there that are interfering with the movement of the butterfly valve, you have probably found the cause of your erratic idle.

Clean out the throttle body thoroughly with a solvent such as "Gumout" until the valve operates freely and opens and closes completely.

Let us know how you make out.

Regards, Maurice.

[Sputter]

FWIW, to do a proper job of it, remove the TB and clean it.

[GranburyChuck]

I got the same response for a very slight stumble like you mention. The TB was cleaned about 4 months ago but I went to do it again. It was spotless. I cleaned it some more anyway. I also spray cleaned the MAF. Neither made a difference. I have had no codes by my Durametric scanner. I had the car at the dealer for another problem and mentioned this. They ran codes, found none, but mentioned that I should use gas without ethanol. Prior to the hurricanes last year (I live in Texas) I could get 100% gas. Now all the stations carry ethanol containing gas. The dealer said that I should drop from premium to mid-grade as the ethanol has less of an affect or there is less. She indicated that at a training meeting they were told this by Porsche. So I will try that at the next fill up. Still, I don't know if that is it. Seems that service technicians can't diagnose any problem without a sensor saying what's up.

[flyboyshell]

Thanks guys, I will try clean the TB out AND drop a grade when refueling.