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Old 07-10-2021, 03:03 PM #1
TowelThief TowelThief is offline
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Diagnosing engine noise.

2006 SR5 4x4 V6 228k

Recent oil change and recent P0174/P0171 Code (cleared after MAF cleaning) about 2 weeks ago. Although my Bank2Sensor 1 LTF trim wont go below 4.69% (idle)

2 days ago I noticed a higher pitched noise coming from the driver side engine compartment. You can hear it on start up in this video. It stays a pretty consistent pitch with RPMs. While trying to pinpoint it I had my wife shut off the car and also heard a hiss and a spark sound from the same area (hear in vid)


06 4Runner noise - YouTube

AC is off in video and doesnt change the sound when on.
Water pump and radiator changed at 175K
P/S fluid replaced 6 months ago...no change to sound when rotating wheel

Your ideas on the cause of these sounds are appreciated! Thanks!
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2006 SR5 4x4 V6
OME 884s with Top Spacer / OME 60020 Rear Shocks / ToyTec SuperFlex Rear Coils / LR UCA's / Cooper Discoverer AT3 275/70/17 on AR Baja's
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Old 07-12-2021, 12:00 PM #2
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The ticking noise at idle is normal, in my experience. What oil brand and viscosity are you using?

That whirring/whining noise immediately after startup will need a mechanic's stethoscope to isolate to the source. $20 and a great investment. It almost sounds like the starter bendix (gear) but that's an uneducated guess. Get a mech stethoscope and carefully probe the starter (thru wheelwell), alternator, belt pulleys, etc until you find the source.
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