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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: K10NM on September 01, 2011, 01:48:58 am

Title: Help identifying this part?
Post by: K10NM on September 01, 2011, 01:48:58 am

Hey all, i was hoping someone could help me identify this: http://www.use.com/68a0f6d4e8660678aab3#
I think it's a vacuum switch, but what is it used for and operate?
Thanks in advance!

Title: Re: Help identifying this part?
Post by: K10NM on September 01, 2011, 02:58:40 am

Sorry, it's an 85 Chevy K10, 350ci, 700r4.

Title: Re: Help identifying this part?
Post by: muddpuppy01 on September 01, 2011, 04:38:07 am

could  be you lock up switch for the 700r4 how is your hooked up now

if it is you need to get a manifold vacuum to there

Title: Re: Help identifying this part?
Post by: joesgarage71 on September 01, 2011, 07:30:00 am

 In the TECH section should be wiring diagrams for your truck showin this part.
 Steve

Title: Re: Help identifying this part?
Post by: Grim 82 on September 01, 2011, 10:00:06 am

It is the low vacuum switch for your trans, and yes it needs manifold vacuum. It unlocks the TC when you mash the gas and create a low vacuum signal.

Title: Re: Help identifying this part?
Post by: K10NM on September 01, 2011, 03:59:25 pm

Thanks everyone for the input! Guess I'll trace the wiring and see if it is plugged up to the transmission, and if so, guess I'll get some vacuum going to it. Thanks again for the help!

Title: Re: Help identifying this part?
Post by: VileZambonie on September 01, 2011, 09:14:26 pm

http://forum.73-87chevytrucks.com/smforum/index.php?topic=20670.0

Title: Re: Help identifying this part?
Post by: VileZambonie on September 01, 2011, 09:35:51 pm

As you can see from the link I posted above that is not the low vacuum switch for the trans. The vacuum switch on the pass side of the firewall is the tip in vacuum switch for an ESC spark ignition system. The low vacuum switch for the torque converter clutch lock up is behind the brake booster on the drivers side and looks similar.

Title: Re: Help identifying this part?
Post by: Grim 82 on September 01, 2011, 11:24:52 pm

Good call Vile. I stand corrected.

Ditch that ESC ignition  ;)

Title: Re: Help identifying this part?
Post by: K10NM on September 01, 2011, 11:54:58 pm

Thanks Vile, saves me some time trying to follow the wiring and/or trying to hook it up! Really enjoying this forum, it's been very helpful with a lot of the things I've done to my truck! Thanks again.

Title: Re: Help identifying this part?
Post by: Grover 1 on September 02, 2011, 11:36:34 am

I just got rid of my ESC ignition on my '86.  Put a new distributor and Q-jet in.  I eliminated more unneeded wiring and possible headaches down the road.  I did a complete makeover under the hood.  Pictures coming this weekend.

Title: Re: Help identifying this part?
Post by: Irish_Alley on September 03, 2011, 12:49:12 am

Quote from: Grover 1 on September 02, 2011, 11:36:34 am

I just got rid of my ESC ignition on my '86.  Put a new distributor and Q-jet in.  I eliminated more unneeded wiring and possible headaches down the road.  I did a complete makeover under the hood.  Pictures coming this weekend.

que?