Quote:
Originally Posted by jhv48
Being a vacuum secondary AVS Holley, most likely you’re experiencing a momentary lean condition because the secondaries aren’t opening fast enough.
Easily cured. My guess is when rebuilt, the secondary spring was replaced with a stronger spring than your car needed. Jump over to this site and it will show you how to replace the spring to a lighter one.
https://documents.holley.com/199r9934-3rev4.pdf |
Secindries that open too quickly do not enriched the mixture, they lean the mixture because they introduce more air w/o the appropriate increase in fuel volume.
The spring in the secondary vacuum diaphragm retards the opening of the secondaries. Increasing spring strength slows the opening event. Decreasing spring strength speeds up the opening event.
If the secondaries are already opening too fast, installing a lighter spring will only aggravate the problem.
Ed