Re: rough idle!@#@! - Saab 900 Bulletin Board - Saabnet.com
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Re: rough idle!@#@!
Posted by 86spg (more from 86spg) on Tue, 25 Jun 2002 21:03:38
In Reply to: Re: rough idle!@#@!, smokinspg, Tue, 25 Jun 2002 19:38:13
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Good deal smoking
This is from the LH FAQ
Engine Temperature / NTC Sensor
It also has to do with idle mixture/coldstart--- If the connector is corroded or the sensor is bad, rough idle!@#@!
One of the least known sensors is the engine temperature sensor (aka NTC II). It is a semiconductor resistor, also know as a thermistor, and the NTC stands for Negative Temperature Coefficient. This means that the sensor's resistance goes down as the temperature goes up. If the ECU applies a fixed voltage to the NTC resistor, it will receive a smaller signal back as input from a cold resistor with higher resistance than from a warm one. This sensor is screwed into the water passage on the intake side of the head between intake runner #2 and #3 on the 900s and just under runner # 2 on the 9000s. Test the sensor by probing the two contact points with a multimeter to measure the resistance which should be:
Cold Engine -5,800 ohms @ 32F (0C) to 2,600 ohms @ 68F (20C)
Warm Engine - 320 ohms @ 176F (80C) to 180 ohms @ 212F (100C).
Good luck EOM
posted by 12.234.9...
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