P0505: idle control system malfunction?

[jikjak]

my 505 code has been acting up the last couple days. i had to clear it about 4 times already in 2 days.

To remove this ad, register today or login if you already are registered!

[benz_addict]

Originally Posted by benz_addict

Stock.
Also getting the code P0106 now... very rough idle after some time. I am going to replace the Manifold Air Pressure Sesnor ($53) and start from there. Good start?

I replaced that my self took me half hour to find the sensor (LOL) and abother 30 mins to replace.

For me the P0106 was caused by the Y-Pipe that attaches to the TB was not on properly due to the flimsy plastic tabs that broke off that secure it to the TB. I made a custom bracket and now it's on TIGHT. Cleared the code and hasn't came back on since (been 300 miles)

As for the P0507 code, for me it was the TB wiring. The TB extension harness that connects from the TB to the harness (about 2ft long) was defective some how and the pin connectors were bad. That was dealt with and after the TB needed re-adaptation. Cleared the code and didn't come back. Hope it doesn't.

[prodigymb]

Originally Posted by benz_addict

I replaced that my self took me half hour to find the sensor (LOL) and abother 30 mins to replace.

For me the P0106 was caused by the Y-Pipe that attaches to the TB was not on properly due to the flimsy plastic tabs that broke off that secure it to the TB. I made a custom bracket and now it's on TIGHT. Cleared the code and hasn't came back on since (been 300 miles)

As for the P0507 code, for me it was the TB wiring. The TB extension harness that connects from the TB to the harness (about 2ft long) was defective some how and the pin connectors were bad. That was dealt with and after the TB needed re-adaptation. Cleared the code and didn't come back. Hope it doesn't.

do you have a part number for the tb harness extension piece? how was it "dealt" with. i get that code to occasionally and i'm not sure what causes it

[benz_addict]

Originally Posted by prodigymb

do you have a part number for the tb harness extension piece? how was it "dealt" with. i get that code to occasionally and i'm not sure what causes it

I'm sorry, I don't have the part number. I got the wiring soldered from where the extension connects.

On the other hand the god damn P0106 code is back with the rough idle. I replaced the MAP sensor already. How can I check if the MAP is getting the correct voltage?

[jicl55]

Originally Posted by benz_addict

On the other hand the god damn P0106 code is back with the rough idle. I replaced the MAP sensor already. How can I check if the MAP is getting the correct voltage?

If you have 80mm throttle body, it may be the throttle body. I had the exact same codes and exact same problem. Think some of the throttle bodies (80mm) that are or may be compatible with the e55 don't work for the CL55, so that may be the case with you. Even may be the case with some E55s and certain years with certain throttle bodies. The throttle body was throwing those codes. If you have scanner, check throttle body % at idle. Should be about 3%. Mine was at 1% with 80mm throttle body. Also may be vacuum leak. Check the brake booster cable plugged near the firewall. There was a seal inside that was leaking just a tad and that was the reason for the rough idle in my car. Had that replaced, idle was much, much improved, but still threw codes until I swapped the throttle body. If you can get someone with a smoke machine to put smoke through your lines, they can pinpoint if and where there is a leak. If no leak, may want to try throttle body swap (stock or perhaps 82mm). I put stock throttle body back on and no codes since and normal idle (~550rpm) now.... over 2k miles. Hope that helps. It is a real pain in the butt.