Which sensors are these?
Thread Starter
Supreme Member
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Joined: Apr 2005
Posts: 1,165
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From: Valdosta, GA
Car: 1991 Trans Am GTA
Engine: L98(5.7 L TPI)
Transmission: 700r4(A4)
Axle/Gears: G80 RPO, 3:23s, Auburn Racer's Diff
Which sensors are these?
While my L98 is out of my 1991 trans am, I would like to replace the sensors that will be difficult to reach once it's reinstalled. On the lower side of the motor, there appear to be four sensors: 2 temp sensors, a knock sensor, and an oil switch/sensor. Is this correct? Are there any sensors I'm missing?
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Which sensors are these?
You forgot map, the cts and iat are the same just different locations.
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2005
Posts: 1,165
Likes: 1
From: Valdosta, GA
Car: 1991 Trans Am GTA
Engine: L98(5.7 L TPI)
Transmission: 700r4(A4)
Axle/Gears: G80 RPO, 3:23s, Auburn Racer's Diff
Re: Which sensors are these?
Map = mass air, correct? CTS = coolant temp sensor. What's IAT? Is there a diagram of where all the different sensors go?
Senior Member
Joined: Mar 2017
Posts: 528
Likes: 46
From: Sweet home Alabama
Car: 1987 GTA
Engine: 5.0
Transmission: Automatic
Re: Which sensors are these?
IAT=intake air temperature. Underside of upper plenum close to fuel pressure regulator on tpi cars. I believe I read some years have them in the air filter duct or maybe folks modify and move them there. I'm not educated on tbi location.
Joined: Nov 2010
Posts: 5,892
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From: Mantua NJ
Car: 1 Owner 1986 TA with a WS6 package
Engine: 5.0 EFI
Transmission: THM700R4
Axle/Gears: 277 Posi Speedo
if you have a 91 it's map (speed density).