How To Know If Your BMW E46 Idle Air Control Valve Is Failing

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How To Know If Your BMW E46 Idle Air Control
Valve Is Failing?
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Idle air control or IAC valve essentially helps
the engine to idle steadily.
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And, to do that, it optimizes air flow to the
engine, when the engine is idling.
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It is supposed to last for the entire life of the
vehicle.
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But, it may fail prematurely due to normal wear
and tear.
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Below is a discussion of all the signs of IAC
valve failure in your BMW E46.
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BMW E46 IAC valve failure- Know the symptoms
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Rough Engine Idle
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A common finding in a car with a defective IAC
valve is rough engine idle.
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This happens due to the obstruction of air flow
to the engine when the engine is idling.
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Frequent Engine Stalling
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Another sign that your BMW E46 IAC valve might be
failing is frequent engine stalling.
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You need to get your IAC valve inspected sooner
rather than later.
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Blinking Check Engine Light
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Just like any other engine-related issues, a
defective IAC valve can set off your BMW E46's
check engine light.
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Use a code reader to retrieve the trouble code to
diagnose and fix the exact issue.
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Engine Backfire
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Another issue of a potential problem with the IAC
valve is engine backfire.
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Have a mechanic inspect the valve and if
necessary get it replaced.
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Hard Starting Engine
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While trouble starting the engine wont
necessarily mean that your IAC valve is failing,
that doesnt mean that this cant be the case.
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BMW E46 IAC valve failure- Know the reasons
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The IAC valve of your BMW E46 can fail due to any
of the following reasons-

• Daily wear and tear
• Carbon build-up
• Fuel varnish deposits
• Electrical issues

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Sum Up
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If youre doubting that your BMW E46 IAC valve is
failing, get it replaced.
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If replacing the valve doesnt address the
problem, call your mechanic right away.
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