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1999 Toyota Corolla airbox noise ( filter box)

Tiny
MARK70
  • MEMBER
  • 1999 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
  • 109,000 MILES
Hi, I have corolla 1999 1zfe engine 1.8l 3 speed automatic transmission. In low idle have that sucking noise in the air box( filter box).I trace that noise and get to the hole in the throttle body, if I cover little bit that hole the noise is gone.I took apart that ISC valve control clean it put it back but still the same. My car have 109 000 miles and like to eat oil, I just want to know if that problem is not oil consumption related. Is that ISC got bad?I've changed PCV valve as well but no improvement. Thanks
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Tuesday, December 22nd, 2009 AT 8:05 AM

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Tiny
MMPRINCE4000
  • MECHANIC
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There should be no hole in the TB, make sure the tube to TB is connected properly.
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Tuesday, December 22nd, 2009 AT 9:50 AM
Tiny
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"the hole" is the air entrance to ISC valve is in the tb. This is passage to manifold intake when tb is close. In the ISC is valve, that valve is vibrating when connect . All the air cables are tide.I changed MAP sensor but nothing help.

Sorry for my English is not my primary language
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Tuesday, December 22nd, 2009 AT 11:27 AM
Tiny
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The IAC (idle air control) valve controls idle by bypassing air through the hole to the intake.
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Wednesday, December 23rd, 2009 AT 7:50 AM
Tiny
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Hi,
I've change that Idle Air Control Valve and nothing change. New part have that vibration, pulsing sound like old one.I've test engine collant temperature control sensor is OK. What do you sugest next I;m out of ideas. Car doesn't throw any codes

Thanks
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Tuesday, January 12th, 2010 AT 9:11 PM
Tiny
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There is a sensor in the air box call IAT (incoming air temp), check that it is seated properly.
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Wednesday, January 13th, 2010 AT 7:00 AM
Tiny
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I've check that is also Ok.I monitor other day engine work and that sensor show outside temperature so is OK I guess. Also I notice my load calc is like 30% on idling, toyota spec 11.3 to 20.0 %
could be ECM problem?Which sensor is used to calculate signal to IAC?
Thanks
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Wednesday, January 13th, 2010 AT 9:40 AM
Tiny
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30% load at idle would add additional fuel to engine. Did you replace IAC?
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Thursday, January 14th, 2010 AT 7:07 AM
Tiny
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Yes,
I replaced IAC, even new one vibrate-buzzing. Also when I replaced Iac I found oil in intaken.
I belive is time to trade this car.
Thanks
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Thursday, January 14th, 2010 AT 7:52 AM
Tiny
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You may want to take to Toyota or trusted garage and get a diagnosis, 110K miles is considered low for a Toyota.

Having said that, if you have a serious problem, then you may be right about trading.
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Friday, January 15th, 2010 AT 9:55 AM

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