After the recent Carlisle event, where one has the chance to compare many similar years and engines to each other, we came up with a real stumper of a part.

One fellow had an 82 CE with a small (what appeared to be a sensor, about 1 cubic inch); with a wire spliced into the wire harness, and a hose plugged to a port on the back of one of the throttle bodies of the cross-fire injectors (drivers side).

These ports are on all cross-fire cars we looked at, but are covered with a factory installed rubber cap (we looked at non CEs as well).

We looked in the service manual, parts book, and looked at all of the catalogs for this part, and found nothing.

We are guessing that there may have been a service bulletin on this, as it appears to be something a dealer would do, and not a tinkerer.

Was the car delivered originally to California? Many California cars had odd little additional parts starting back in the early seventies.

Thanks for the note. It did not solve the mystery, but it may actually help. No one at Corvettes at Carlisle thought of this. Also, most cars we looked at have probably not been titled very far from where they started.