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psalt psalt is offline
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Join Date: Mar 2006
Posts: 1,107
Hello Eric,

Yes, they do. One of the most clever things about CIS is the little needles fitted to the ends of the injectors. They chatter audibly at a high frequency directly related to the volume of fuel injected. They are one reason that CIS injectors have better atomization than EFI injectors. You can definately hear them working, and after around 30 years of listening, you know there is a problem when you can't hear them. The sound can fool some people because it does sound like mild pinging and is related to pedal position.

Old 02-14-2008, 02:20 PM
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