what is the screw on top of my tb?
03-16-2006, 01:19 PM
#11
6th Gear Member
Join Date: Nov 2005
Location: Rochester, NY
Posts: 8,467
RE: what is the screw on top of my tb?
well i think it controls ur car's idle, the more open it is the higher it would idle i believe. I have to go now but if you havnt gotten an answer by later today i can look it up in my service manual for ya
03-16-2006, 01:20 PM
#12
5th Gear Member
Thread Starter
Join Date: Feb 2006
Location: Southwest VA.
Posts: 3,915
RE: what is the screw on top of my tb?
coo...thankx man.
ORIGINAL: OnyxCobra
well it controls ur car's idle i believe, the more open it is the higher it would idlee i believe. I have to go now but if you havnt gotten an answer by later today i can look it up in my service manual for ya
well it controls ur car's idle i believe, the more open it is the higher it would idlee i believe. I have to go now but if you havnt gotten an answer by later today i can look it up in my service manual for ya
03-17-2006, 03:44 PM
#14
6th Gear Member
Join Date: Nov 2005
Location: Rochester, NY
Posts: 8,467
RE: what is the screw on top of my tb?
okay man this is all my service manual says about it
The idle air control valve (IAC valve)(9F715):
-is used to control engine idle speed (rpm)
-is mounted on the throttle body
-allows air to bypass the throttle plate. The amount of air allowed to bypass is determinted by the powertrain control module (PCM)(12A650) and controlled by a duty cycle signal.
The idle air control valve cannot be cleaned and must be replaced (if required).
The idle air control valve (IAC valve)(9F715):
-is used to control engine idle speed (rpm)
-is mounted on the throttle body
-allows air to bypass the throttle plate. The amount of air allowed to bypass is determinted by the powertrain control module (PCM)(12A650) and controlled by a duty cycle signal.
The idle air control valve cannot be cleaned and must be replaced (if required).
03-18-2006, 01:24 AM
#17
Banned
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
RE: what is the screw on top of my tb?
wow guys.... you are all guessing...
oddly enough... you are all correct. this screw is the IAC adjustment screw. you can PROPERLY ADJUST the idle by turning this screw, while also grounding out the gray connector in the eec harness. This wire is also called the STI (Self Test Indicator) wire, and can be used to check for CEL codes when a OBD-1 scanner is not available.
by grounding that connector it puts the ECU into a test/adjustment loop mode. using your tac... you can adjust your idle to smooth it out, or even increase/decrease it. you SHOULD be around 800rpms... normal idle!
oddly enough... you are all correct. this screw is the IAC adjustment screw. you can PROPERLY ADJUST the idle by turning this screw, while also grounding out the gray connector in the eec harness. This wire is also called the STI (Self Test Indicator) wire, and can be used to check for CEL codes when a OBD-1 scanner is not available.
by grounding that connector it puts the ECU into a test/adjustment loop mode. using your tac... you can adjust your idle to smooth it out, or even increase/decrease it. you SHOULD be around 800rpms... normal idle!
03-18-2006, 02:12 AM
#18
5th Gear Member
Thread Starter
Join Date: Feb 2006
Location: Southwest VA.
Posts: 3,915
RE: what is the screw on top of my tb?
well...lol, id say thats a rather fine answer you have there adder! 
i thank ya man.
i thank ya man.
ORIGINAL: AdderMk2
wow guys.... you are all guessing...
oddly enough... you are all correct. this screw is the IAC adjustment screw. you can PROPERLY ADJUST the idle by turning this screw, while also grounding out the gray connector in the eec harness. This wire is also called the STI (Self Test Indicator) wire, and can be used to check for CEL codes when a OBD-1 scanner is not available.
by grounding that connector it puts the ECU into a test/adjustment loop mode. using your tac... you can adjust your idle to smooth it out, or even increase/decrease it. you SHOULD be around 800rpms... normal idle!
wow guys.... you are all guessing...
oddly enough... you are all correct. this screw is the IAC adjustment screw. you can PROPERLY ADJUST the idle by turning this screw, while also grounding out the gray connector in the eec harness. This wire is also called the STI (Self Test Indicator) wire, and can be used to check for CEL codes when a OBD-1 scanner is not available.
by grounding that connector it puts the ECU into a test/adjustment loop mode. using your tac... you can adjust your idle to smooth it out, or even increase/decrease it. you SHOULD be around 800rpms... normal idle!
Thread
Thread Starter
Forum
Replies
Last Post
jwog666
Pipes, Boost & Juice
11
12-27-2021 08:09 PM
breaking
Audio/Visual Electronics
5
10-02-2015 01:27 PM