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Common Problems of the Jeep Wrangler Idle Air Control Valve
The idle air control valve or the IAC valve is one of the various control devices in the Jeep Wrangler that help ensure that its 4- to 6-cylinder engines work efficiently when idling. Normally the IAC is designed to last as long as the engine itself, although various reasons, such as everyday wear or tear or foreign objects entering the valve for example, can cause the valve to break down. Thankfully, Jeep Wrangler idle air control valve problems are rare, but it still pays to be aware of the various signs that may start to malfunction. In this guide, we'll list down some of the more common problems of Wrangler IAC valve:
The check engine light is on
One of the first signs that may indicate that the Wrangler's idle air control valve is starting to go back is the check engine light. If the check engine light is on, you may be able to use an OBD scanner to identify the code which caused the light to activate. For Wranglers manufactured on or before 2006, codes P505 to P509 indicate a problem with the idle control system (of which the IAC valve is part of. For newer Wrangler models, the code is 11, 12, 13, 16, 17, and 19, and 25.
Stalling and poor idling
IAC valves are highly vulnerable to carbon and coke buildup, and if too much deposit has accumulated on the valve it can cause the engine to stall and poor idle quality. Regular inspection of cleaning of the valve every 40,000 can help prevent clogging and, in turn, stalling of the engine, but if the valve has severely buildup replacement may be a better option to take.
Rough engine operation
A Wrangler engine that runs roughly and dies frequently may be an indication that the idle air control valve is losing pressure. In most cases this loss in pressure is due to a torn or punctured vacuum hose connecting the IAC valve and motor to the intake manifold. Turn off the engine and inspect the vacuum hose as well as all engine accessory lines for tears and other signs of damage and wear. Make sure to replace any compromised lines as soon as possible.