idle variation on C4
 

My 92 C4 has an idle that is very sensitive when first started. If the gas pedal is pushed and then let off, the car almost stalls but recovers just in time. In addition, the car has poor throttle response for the first 4-5 minutes of operation. Basically it acts like the mixture is to lean. I'm suspecting a the mixture flapper valve is dirty or sticking slightly. Anyone have this problem?

Could be that. Check the Temp sensor on the left cam cover as well, I think it should read 2000-3000 Ohms when stone cold. May not be sending the correct information to the computer on cold starts. Also check the inline fuse for the preheater on the 02 sensor. A blown fuse here can also cause wierd cold start behavior.

Good Luck.
Nick.

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Nick Shumaker
1982 911SC Coupe
nickshu@yahoo.com
PCA -- Rocky Mtn. Region

I'm pretty sure that when my floormat gets pushed up toward the gas pedal too far, it causes a similar condition. I forget the technical explanation (a mechanic told me this), but it is easy to check and try it.

find a shop with a bosch "hammer" and do a system adaptation. this often straightens out odd running problems.