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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Grover 1 on June 19, 2011, 10:20:56 pm

Title: Anyone know what this is for?
Post by: Grover 1 on June 19, 2011, 10:20:56 pm

Here is a picture of a switch.  It is on the firewall of my 86 Silverado passenger side.  The vacuum line goes to a port on the carb.  Any idea what it switches? - Thanks guys.

Title: Re: Anyone know what this is for?
Post by: TexasRed on June 19, 2011, 11:16:20 pm

Tip in switch for the distributor. Do you have the stock distributor or have you converted to an older style?

Title: Re: Anyone know what this is for?
Post by: Grover 1 on June 19, 2011, 11:54:28 pm

I have the stock distributor.

Title: Re: Anyone know what this is for?
Post by: Grover 1 on June 20, 2011, 11:56:26 am

So do I need this or is it a source for problems?  Do I need to  replace the distributor to eliminate it?

Title: Re: Anyone know what this is for?
Post by: TexasRed on June 20, 2011, 05:48:03 pm

All the tip in switch does is retard your timing a bit on acceleration. If you haven't really noticed a problem, you're probably fine. You could either convert to an older style distributor or get a 4 pin module which eliminates the ESC.

Here's some more info:

http://www.73-87.com/7387garage/drivetrain/escrepl.htm