![]() If you determine that you need a new idle air control valve, they are relatively affordable. Here’s a great YouTube video on how to clean a idle air control valve. You may need a new one, or you may be able to get away with cleaning it. The IAC valve can get either dirty or stuck. It does this by letting in just the right amount of air to get the idle speed where it needs to be. The idle air control valve’s primary job is to regulate the idle speed of your engine. While replacing the idle air control valve seems like a good idea, it’s worth your time to check for a vacuum leak first. Typically, P0505 is going to be caused by either a vacuum leak, or a problem with the idle air control valve. Here are some of the most common symptoms of P0505: This particular trouble code lets you know that there is something wrong with the idle air control system, but that’s about it. When P0505 is triggered, it is typically caused by a stuck idle air control valve, a clogged idle air control valve, or a vacuum leak. P0505: Idle Air Control System: Malfunction It’s a generic code, which means that it has the same meaning for the Astra as it would any other vehicle (Astra or not). As the car idles well where do I look for the problem please.P0505 is an OBDII code that deals with the idle air control system in the Opel Astra. I have disconnected the MAF sensor with no change just to rule it out. The fault was originally intermittent but now the ECU light is on continuously. I have reset the fault code but it come back after about 1 minuet and stays on. I also checked the carb gear train operating the air valve, it was spotless with no visual problem. I took the carb off and cleaned the carb throat as it was dirty but no change to the fault code or flat spots. eg If I try to hold the car at a steady, perhaps at 40 mph, I get a symptom of fuel starvation, flat spots, if I accelerate hard the flat spot clears and accelerates forward fine. There is a slight fluctuation of about 100 rpm when at idle. However, my Astra 1.8 16v petrol, 2000 V reg, x18xe1 engine, idles very well and starts well. Hi, I've been reading the reports associated with the p0505 fault code, high voltage, as I have recently got this fault and to try to find a solution. ![]()
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December 2022
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