Test pipe installed, now the car wont idle..HELP!

Don't know about Ferrari ECUs but typically it is going to take more than 10 minutes of idle for the ECU to relearn the map. You will need to take it out for at least a 30 minutes drive.

 

There are two screws that adjust the idle on the throttle bodies or the intake, I forget which. Tim Stanford adjusted mine and he made sure to loosen both nuts that keep them set, then adjust both about 1/8 turn, then tighten both nuts that hold the settings. He said it is very important to keep them set the same or your car won't run correctly. I don't have any detail engine pictures or I could point them out to ya. If nobody gives you the definite answer I can take a picture this weekend and use a pointer for identifying the part to adjust. Tim did this about two years ago, and the car has never stalled at idle since then. Also, to reset the ECU I did the idle for about twenty minutes and that seemed to work fine. I have read that you are not supposed to drive the car while the ECU's are being reset.

BT

 

Hi, that sounds like a broken O2 sensor or a bad connection regarding this.

Regards, Georg

 

Try to disconnect both O2 sensors, the car should idle fine without them. If not, your problem is elsewhere.

 

I recently installed and reinstalled (long story) test pipes without any problem. Car runs fine. I did not disconnect the battery though. That may be your problem not the test pipes.

 

Yup. Georg and Eric and BT have the right ideas. Could be a broken O2, or the O2 sensors could be plugged into the wrong side (i.e. left O2 on the right wiring harness connectors and vice versa) or it could be that your new free-flowing exhaust needs the idle adjustment screws opened up a bit more.

Eric's test is the first thing that you should do. Also make note if the car behaves any differently when the motor is warm than when it was cold.

 

I removed my cats and installed 'gutted cats'. The battery was turned back on , and it ran with no issues (it didnot matter weather I idled the car for 10 minutes or drove the car right away).

If does indeed sound like you have a bad cat sensor or wire.

Note: I have found the car runs fine after disconnecting the battery regardless if I let the car idle for 10 minutes or not.
I think if the sensors are failing the 'warm up period' is more crucial.
When I spoke with the local dealer they reconfirmed this.

Anyways, I didnot like sound of the 'gutted cats' and reinstalled my good cats....again no issues ( no lights and it ran fine WITHOUT THE 10 MINUTE IDLE).

 

Per the workshop manual, when you disconnect the battery (i.e. change ANYTHING), you need to let the car idle for 10 minutes so it can re-learn the correct parameters (with no load on the system, AC off, etc.) I haven't always done this and it seemed to work fine regardless, but going forward I'll follow this guideline...

 

Maybe a bad vacuum hose? I am not really familiar with the 348 system, but what you describe sounds like a loose or torn vacuum line.
BT

 

See post #8 and DO THE TEST!