P0505 Unlocking the Secrets of Throttle Position Sensor Diagnostics

LS - 1st and 2nd Gen (1990-2000) - P0505 Idle control malfunction - Got a CEL this weekend on my '98 LS. I pulled a P0505 code out of it ... Customer: I have a code p0505 and I changed the idle control valve twice. Mechanic's Assistant: Have you seen this error before with the same vehicle? The error seems to happen before the Jeep ever starts, or the code does not get logged until the jeep is turned off. That code can mean anything that interferes with a smooth idle, including bad gas, oil in the charge pipe, a dirty Maf sensor, even a broken ... My check engine light is on and it's throwing the P0505 code out which is an "Idle Air Control Malfunction." I thought for sure by changing out the IAC sensor, ... Looking at P0505, it does list Idle Control System Malfunction. Unfortunately, it is rather vague. There is no separate IAC valve anymore. Code P0505 ... The most likely item is a vacuum leak providing unmetered air to the engine rising the RPM. Open the hood, remove the side covers ... It says most common reasons are Stuck IACV or a vacuum leak. When I suspected IACV problems, I just popped the valve off, 2 bolts, stuck a 9 volt battery to ... How to test and replace idle air control valve ! CODE P0505 ! Quick and Easy Fix ? Hi guys, The problem with this car is that after starting ... If one of the applied vehicles above has a DTC P0505 AAC/V stored, with no customer driveability incident, it may be caused by an elevated ...