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Old 02-04-2004, 09:03 AM   #1
hatake
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Member#: 34811
Join Date: Apr 2003
Location: Denver
Vehicle:
04 Baja T
Black

Question BOV sound(s)

Baja Turbo is my first turbo car - and recently I noticed (seemingly) a BOV releasing the pressure off of the system for about one second when I first start the car in the morning. It runs fine. It didn't do that at the start up till a week or so ago. So I blipped throttle before I shut the engine off - and it doesn't seem to exhibit the symptom. Is this common if you don't blip before you shut off the engine? Or is my BOV not working correctly? Can you experiment your turbo? Thanks.
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Old 02-04-2004, 08:30 PM   #2
Subietonic
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Location: Low Country, SC
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Four Count 'em
GF5,BDA,BD5, BP5

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I'm not sure what it is you're hearing. Is it a true pfffffshhhh BOV sound or something else? Can you isolate it to any given area in the engine compartment?

Just as a general note, it's probably not a good idea to blip OR rev the engine on any turbo and then immediately shut it down. The turbo needs a little bit of time to stop "turning" after it's spooled up from the increased rpm's. This is especially true of the Baja/FXT turbos that start spooling at ridiculously low rpms. I typically let it the turbo spin down for 30 secs or more, just to make sure that it's not turning without oil pressure and to make sure that the oil doesn't "sit" in the turbo and cook while it's returning to it's stopped state.

Would be interested to hear more about the sound though.

Br, Dale
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Old 02-05-2004, 08:31 AM   #3
hatake
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Black

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Thanks for your input - it's coming from engine bay, toward right hand side looking from inside the cabin. Hence my assumption of BOV. Sound is, yes, like "pfffffshhhhh" kind that I hear when I deceleration (quieter though). One second and it stops. I'll mention it to the service guy when I take my car in (I wasn't going to do any oil change at anywhere else other than in my garage, but what the heck).

Thanks for the tip on blipping. Your explanation makes sense. Let me observe with different situations as well... Thanks again!
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Old 02-05-2004, 08:52 AM   #4
cadillacjake
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Member#: 49969
Join Date: Dec 2003
Location: Crestview, FL
Vehicle:
2004 Baja Turbo
Black Granite Pearl

Default Ideas

I'm not sure about this, just floating ideas here. Is there a vacuum reservoir that gets charged at startup? I'm sure that this motor must have either a vacuum pump or at least a reservoir for operating the power brakes and again, I'm not sure here, the HVAC system's selector doors. This could be the reservoir being recharged after losing vacuum overnight, and by goosing the throttle before shutdown, maybe it created enough vacuum as the motor wound down to recharge the reservoir enough to where it wasn't noticed on the next engine start. I dunno, just an idea.
Also, many cars now cycle the A/C compressor for a second or so at startup to ensure the seals don't rot out, maybe? Don't laugh if all of this is way off base, I'm still waiting on my Baja-T to get here!
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Old 02-05-2004, 10:07 AM   #5
Subietonic
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If it is coming from the right front of the engine compartment (viewed from behind the wheel), then it's possible what you're hearing is the ABS servo motor cycling. It will typically do this (and make the sound you described) at each start up. Some times it's more apparent (audibly) then others. Just a thought.

If it were coming from directly in front of the steering wheel area, then I would think that it's the BOV since that sets in that "general" area on the front side of the TMIC but don't know necessarily that the situation you describe is consistent with BOV operation.

HTH and back over to you..

Br, Dale
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