Posts Tagged: vacuum leak
Bad idle air control valve
Bad idle air control valve symptoms Idle speed goes up and down or high idle First off, this is a fairly common problem for all makes and models. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or a dirty mass airflow sensor (MAF). But it can also be caused by a vacuum leak. How an idle air control valve works If you’re familiar with older carbureted cars you remember that you turned a screw to set the idle speed. The screw turned … Read More