Where is the knock sensor on a 2000 Tahoe 53L?
Under the intake manifild. There are 2. The rear one goes bad and sets the Check Engine Light.
IAT (inlet air temperature) and CTS (or CATS charge air temperature sensor) are the same thing. For most GM engines, like the 5.3L, a MAFS (mass air flow sensor) is used instead of a CATS. The MAFS is the big black cylinder with a wire bundle coming off of it that is between the clean air hose and the air filter box.
The 5.3L replaced the 5.7L because automakers have to constantly improve on fuel economy and reliability. The new 5.3L fall under GM's 5yr / 1000,000 mile powertrain warranty. The old 5.7L never achieved this. For economy, the new all aluminum 5.3 Liter is the winner, hands down. However the reliability of this engine has not been determined as of yet. The 5.7 however has established a long history of being a very reliable engine.
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