IAT Sensor - Intake Air Temperature Sensor

The Intake Air Temperature (IAT) sensor determines the air temperature inside the intake manifold. Resistance changes in response to the ambient air temperature. The sensor has a negative temperature coefficient. As the temperature of the sensor rises the resistance across the sensor decreases. This provides a signal to the PCM indicating the temperature of the incoming air charge. This sensor helps the PCM to determine spark timing and air/fuel...

Read More

Oil Around Spark Plug Threads?

I found oil around all 4 of my 1998 Chevy Cavalier Z24 2.4 Litre spark plug threads.Could this be the result of a previous compression test!? It is unusual to find oil around the spark plug threads. What does this mean? Oil on your spark plug(s) may indicate worn piston rings. worn piston rings will allow for oil to "slip" past them. a cheap diagnostic test you can perform at home is called a "leak down", or vaccum test. most auto parts...

Read More

What Are The Signs Of Warn Piston Rings?

What are the signs of worn piston rings on a 1998 Chevy Cavalier Z24 2.4L LD9 engine? Bad rings usually cause excessive blue smoke to emanate from tail pipe AT ALL SPEEDS. ruff idle, smoking exhaust, oil soaked plugs Most modern 1998 Chevy Cavalier Z24 2.4L car engines are built to such high standards that piston rings nearly NEVER wear out, unless from improper maintenance, or using cheap oil and never changing it. Most cars that use or burn...

Read More