Fix code P0505 P1505 P1129 surging idle Honda CRV
If you have P0505 P1505 P1129 surging idle Honda CRV you may have a bum idle air control valve (IAC). Here’s how to check.
First, make sure the coolant level is full and that the cooling line running to the IAC is hot. If the line isn’t hot but the engine is, the line is blocked. Clear it before proceeding. Next, cover the throttle body while the engine is running. The engine should stall. If it doesn’t, you have a vacuum leak or a faulty PCV valve—somewhere the engine is getting air.
Next, block the feed port to the IAC with the air boot off the throttle body. The idle speed should come down to normal. If it doesn’t, the IAC may be sticking. But before you replace the IAC, make sure the black wire at the IAC has a good ground connection.
© 2012 Rick Muscoplat