Ever since I installed catless downpipes I have been getting a P0505 code. Can someone give me some info on a normal idle state?
Using an OBD reader I'm seeing this:
Throttle 0%
Idle in Park: 735 rpm
Idle in Drive: 550 rpm (give or take a little)

This is when the car is at full temp. I clear the code and it seems to trip after the car gets to 190F.

Also when moving the gas pedal slightly rpms increase but I don't see any throttle position change for the first 1/16th inch of pedal movement. I have removed the supercharger and replaced all the gaskets again, then pressure tested for leaks. Found none. Waste of time it runs exactly the same.

The car starts and runs great. Smooth power, idle sounds perfect to my ears. If the check engine light didn't come on I would not think there is a problem.

Can some of you guys look and see what your car is doing at idle so I can compare?

THANK YOU.

 

Hi

The idle speeds sound ok, but I'm not sure that it's actually an idle control problem (as indicated by the code). Did you turn off the "rear oxygen sensor diagnosis" in the ECU when you fitted the new downpipes? It sounds like the ECU is going into closed loop mode when it reaches 190 and doesn't like what it's seeing. Just my guess, anyone else got any ideas?

 

CL707- I can see you replied but I can't read it for some reason.

Ok now it loaded.

 

It's a good guess, I did not turn off the rear sensors. The downpipes do have extended pipes to keep the rear sensors out of the exhaust stream. Maybe Rob from Needswing will see this and chime in.