Rick's Free Auto Repair Advice

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

Fix code P1506 on Ford

Fix code P1506 – Idle Air Control System Over speed Error If you get this P1506 – Idle Air Control System Over speed Error code on a Ford vehicle with the Duratec engine, don’t start with an idle air controller valve (IAC) replacement. This vehicle has a LOT of vacuum leaks and that can cause serious idle problems. Air leaks into the engine AFTER the MAF has already metered the incoming air. So the oxygen sensor sees a very lean exhaust. Since the vehicle is at idle, the computer tries … Read More


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