Quote:
Originally Posted by rogerzr1
I took the z out for a short run this afternoon. Everything was great untill I stopped to top off the tank. When I got back in the car and turned the key there was no vacuum pump sound. The car cranked and I drove it home but the secondaries were not working. Now at home when I turn the key on the pump cycles for less than a second and shuts down. Please help.
Thanks, Roger.
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The pump should shut off, its not supposed run all the time or you have a vacuum leak.
You should check connections on the pump which sits by the overflow radiator tank. Also make sure the thin black wire which goes to the plenum is connected. What I mean by that is that is not one line but two pieces together. You will see where the line gets fatter, that is where they connect together. Make sure they are firmly inside one another.
Do you have any SES lights? If so and there are codes, secondaries won't work.
The secondary pump is really just to assist for high rpm extended high speed runs. The secondaries should still work even with that pump not working. Perhaps you have issue with vacuum leak. You can test it with a mityvac pump.
This article is very helpful:
http://www.corvetteactioncenter.com/...0/002/article/
Good Luck!