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SportTrac Discussion
Engine & Drivetrain
Engine bay whine
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<blockquote data-quote="DILLARD000" data-source="post: 1041989" data-attributes="member: 74901"><p>Have you made any recent changes\mods, like to the AirFilter or AirFilterBox?</p><p>If above mentioned possible causes+solutions don't pan out,</p><p>another possibility is the IACValve, mounted on top of IntakeManifold throat, behind ThrottleBody.</p><p>These can develop a high pitched whine that gets louder as RPMs increase.</p><p>Remove the IACV. Inspect Figure8 ORing; it can dry out & crack; </p><p>replace with new ORing or a homemade cardstock gasket or at least a little PetroleumJelly on the old one.</p><p>Clean IACV with CarbThrottleSpray & soft Brass\Tooth\GunBarrel Brush, then lightly oil the Valve stem+seals.</p><p>As a last resort, replace the IACV with new.</p><p><a href="https://2001fordexplorersporttrac.fandom.com/Engine_AirIntake_IdleAutoControlValve" target="_blank"><span style="color: rgb(61, 142, 185)">Click here for more info on IACValve for the 2001~2005=Gen1 ExST V6~4.0L~SOHC engine.</span></a></p><p></p><p>[ATTACH=full]1904[/ATTACH]</p></blockquote><p></p>
[QUOTE="DILLARD000, post: 1041989, member: 74901"] Have you made any recent changes\mods, like to the AirFilter or AirFilterBox? If above mentioned possible causes+solutions don't pan out, another possibility is the IACValve, mounted on top of IntakeManifold throat, behind ThrottleBody. These can develop a high pitched whine that gets louder as RPMs increase. Remove the IACV. Inspect Figure8 ORing; it can dry out & crack; replace with new ORing or a homemade cardstock gasket or at least a little PetroleumJelly on the old one. Clean IACV with CarbThrottleSpray & soft Brass\Tooth\GunBarrel Brush, then lightly oil the Valve stem+seals. As a last resort, replace the IACV with new. [URL='https://2001fordexplorersporttrac.fandom.com/Engine_AirIntake_IdleAutoControlValve'][COLOR=rgb(61, 142, 185)]Click here for more info on IACValve for the 2001~2005=Gen1 ExST V6~4.0L~SOHC engine.[/COLOR][/URL] [ATTACH type="full"]1904[/ATTACH] [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Engine bay whine
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