i have a code 21 on my 305 tpi in a 37 chevy. how can i check the sensor with a ohm meter or volt meter. what are the paramaters? at closed position it shows 110 ohms then when gradually opening it drops to .3 and gradually increases to 4.7at full open. also can this fault cause a ping?
What you are looking for is a spot where it changes radically. It's like a volume control on a radio. You're looking for the noisy spot. Not easy to find with a digital meter. You say it measured 110 Ohms, then drops to .3.... Is that .3 or .3K Ohms? It should be linear, not go all over the place. If it's bad just replace it.
Al
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