lt1 throttle body question
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Joined: Jul 2006
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Car: 89 GTA
Engine: 94 LT1 with Painless Perf. cam kit
Transmission: 700r4 2100 stall conv. Vette servo
lt1 throttle body question
do any of you guys know why a lot of lt1 throttle bodies have a small hole drilled in them in the front, below the two main inlet ports? Was this some sort of GM fix for a particular problem. I plugged mine back up. Thanks.
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Re: lt1 throttle body question
then you get the people who bypass it thinking they pick up massive HP gains
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From: Bright, IN
Car: '86 Bird, 96 ImpalaSS, 98 C1500XCab
Engine: LG4, LT1, L31
Transmission: 700R4, 4L60E, 4L60E
Axle/Gears: 3.73 Tors, 4.88 spool, 3.73 Eaton
Re: lt1 throttle body question
That's the idle air supply. It works with passages in the LT1 manifold to distribute idle air evenly to each port. If you're not using an LT1 manifold, then plugging it is fine.
Last edited by 86LG4Bird; Sep 23, 2011 at 12:58 PM. Reason: corrected post. previously said IAC air supply
Joined: Apr 2005
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
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Re: lt1 throttle body question
plz take a photo
it has to be the coolant passage. can you pass something through it like a pencil or piece of wire? If so, that's all it is, the coolant passage and it's not needed
it has to be the coolant passage. can you pass something through it like a pencil or piece of wire? If so, that's all it is, the coolant passage and it's not needed
Last edited by torque_is_good; Sep 22, 2011 at 08:13 AM.
Thread Starter
Joined: Jul 2006
Posts: 67
Likes: 1
Car: 89 GTA
Engine: 94 LT1 with Painless Perf. cam kit
Transmission: 700r4 2100 stall conv. Vette servo
Re: lt1 throttle body question
it looked like it wasnt supposed to be that way. Its only about a 1/8" diameter hole. like someone just drilled it out.
Thread Starter
Joined: Jul 2006
Posts: 67
Likes: 1
Car: 89 GTA
Engine: 94 LT1 with Painless Perf. cam kit
Transmission: 700r4 2100 stall conv. Vette servo
Re: lt1 throttle body question
this is just below and in the center of the two main air intake holes (ports) in the throttle body. Looking at it from the front. I think 86LG4bird had it right. It must be for the IAC motor.
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Thread Starter
Joined: Jul 2006
Posts: 67
Likes: 1
Car: 89 GTA
Engine: 94 LT1 with Painless Perf. cam kit
Transmission: 700r4 2100 stall conv. Vette servo
Re: lt1 throttle body question
i'm using a painless pcm and the IAC motor. Probably should open the hole back up then. Just would like to know why it was drilled out in the first place. Doesnt look like something done at the factory.
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
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