Engine Intake leak ? Intermittent frequent whistling sound with racing idle


Asked by JP1956 Mar 14, 2014 at 11:33 PM about the 2001 Hyundai Santa Fe GLS AWD

Question type: Maintenance & Repair

.Had to change valve cover gaskets & decided to replace all dry rotted & leaking hoses
& PCV at same time. After putting all back together idle searching from 1600 to 2600.
Rechecked all hoses, fittings & also replaced IAC (cracks in body by mounting bolts.
Then steady high idle 2600 RPM. Smoked engine, replaced lower & upper intake
gaskets. Idle still screaming at 2600 so pulled MAF and returned to normal if not a bit
low (550 to 690). Replaced MAF, idle STILL screaming at 2600 unless I unplug
connector. Engine now has intermittent but more frequent high pitched whistle, sound
like pass side or near firewall center of engine. Tried carb cleaner & propane, no
leak/suction or engine smoothing. Can there be a crack in 1 of the 2 pieces of the
intake manifold or plenum that is opening & closing with temp changes and the whistle
is air leaking or out ? Desperate to be pointed in the right direction here.

1 Answer


My first thought is a large vac leak since it started after you replaced hoses. Could it be that you have some hoses routed wrong? If you can hear it and the idle is that high, I'm thinking a large vac hose like power brake booster hose or PCV hose.

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