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Reload this Page LOUD VIOLENT SUCKING SOUND!!HELP!!

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Old 10-15-2000, 03:18 AM   #1
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LOUD VIOLENT SUCKING SOUND!!HELP!!
HELP!! I got a loud violent sucking sound coming from my Elelbrock baseplate region. I put spray everywhere, and cant seem to pinpoint it. Is it the IAC, or something else? Its a 1988 formula w/FULL mods. Still have the stock chip though.. Thanks in advance!!

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Old 10-15-2000, 11:20 AM   #2
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Get a piece of hose... put it your hear and snoop around the engine with the other end. It helps a lot to pinpoint noises

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

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Old 10-15-2000, 11:29 AM   #3
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Car: 1988 Firbird
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Check your power brake booster line ti the plenum, maybe it came off or is leaking.

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1988 Formula 5L/5sp 3.45 gears, SLP cold air kit, MAS gutted, TPIS air foil, TPIS AFPR, MAC headers, Mac under drive pulleys, MAC cat back, Relocated MAT.
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Old 10-18-2000, 06:45 PM   #4
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Are you sure it's the base plate ? On mine it was the IAC that was stuck closed and it was making a VERY violent sucking sound. Sounded like I had a supercharger in there or something... LOL
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Old 10-19-2000, 12:37 AM   #5
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my car also makes a violent sucking sound that started right after i put the edelbrock throttle body on the IAC works fine it is just the 52mm throttle body. if i put my finger over the hole to the IAC circit and wait for a minuet then release my car screams up to 3000 rpm and the sucking sound is so loud it hurts your ears.

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90 iroc l98
last season best corected 13.62 @102
mods
full exhaust, AFPR, pulley, jet stage 1 chip, billet servo, 52mm throttle body and a few other little things.
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Old 10-19-2000, 03:31 AM   #6
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Make sure the vacuum hose is on your fuel pressure regulator. I left mine off and got that sucking/screeching sound too.

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Reload this Page LOUD VIOLENT SUCKING SOUND!!HELP!!
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