Author Topic: vacuum advance question  (Read 12698 times)

Offline txchainsawgogi

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Re: vacuum advance question
« Reply #15 on: September 10, 2010, 05:34:46 pm »
I don't know how to check it!

Offline txchainsawgogi

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Re: vacuum advance question
« Reply #16 on: September 11, 2010, 07:13:32 pm »
Alright I've got a light... when I loosen the dist. Clamp and rotate it do I do this with the engine running or what? How do I know what marking to match it up with? 8-12 BTDC?

Offline Lt.Del

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Re: vacuum advance question
« Reply #17 on: September 11, 2010, 07:34:33 pm »
sure, move it around while idling....you can get a good idea of what it sounds like in the different positions.  
Clip the timing light on the #1 spark plug wire....looking at engine 1st plug wire on right, closest to you.

aim the light at the harmonic balancer.  You should get a yellow marker, or white chalk or something to highlight the mark on the harmonic balancer first.  Then put a white mark or something on the correct setting on the guage over the harmonic balancer, whether it is 8btdc or whatever.   Idle the engine w/ the vacuum advance hose unplugged from distributor and plugged with a golf tee or something.  If 87 or newer, unhook the brown  or tan wire near master cylinder that controls advance.

turn distributor until the lines match up on balancer.  Then tighten up the 9/16" bolt to hold down the distributor and you're set.  I tend to not go by the factory settings ---i go w/ what feels good to me.

« Last Edit: September 11, 2010, 07:41:12 pm by SgtDel »

Offline txchainsawgogi

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Re: vacuum advance question
« Reply #18 on: September 11, 2010, 08:00:38 pm »
Ahh ok. Wasn't sure about moving it while idling...it makes sense but my haynes doesn't mention it. Do I have to keep my hand on it when its loose?

Offline TexasRed

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Re: vacuum advance question
« Reply #19 on: September 11, 2010, 09:02:40 pm »
You're not loosening it that much. Just enough that you can rotate it.

Offline Lt.Del

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Re: vacuum advance question
« Reply #20 on: September 11, 2010, 11:27:46 pm »
it won't spin around on you or anything....it may shock you though.  I take a rag and put it on the dist.cap and I won't touch the wires while it runs.

Offline 454ss

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Re: vacuum advance question
« Reply #21 on: September 12, 2010, 12:19:42 am »
it won't spin around on you or anything....it may shock you though.  I take a rag and put it on the dist.cap and I won't touch the wires while it runs.

x2, been there.
Jay
Searching for my ideal 1973-87 fullsize.
1982 C10 Custom Deluxe stepside - traded
1977 C10 Custom Deluxe longbed - junked
Current:
1991 Chevy S10 Blazer 4x4
1995 Olds Silhouette
2009 Chihuahua

Offline beastie_3

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Re: vacuum advance question
« Reply #22 on: September 12, 2010, 02:50:56 pm »
X3 on shocked. Been shocked on my 66 I6 mustang when I converted to the pertronix as well as on my HEI

Offline txchainsawgogi

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Re: vacuum advance question
« Reply #23 on: November 27, 2010, 07:10:55 pm »
Oh yeah...never got around to setting my timing. I checked but don't have timing marks. It runs smoothly and strong but I'm getting crap mileage!

Offline 1979C20

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Re: vacuum advance question
« Reply #24 on: November 30, 2010, 05:21:17 pm »
x4 on being shocked, although I got shocked while the truck was off! the key was on and i was setting the plug wires to firing order. ZZZZZ. Ouch. Haha.
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline haulinb1

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Re: vacuum advance question
« Reply #25 on: December 20, 2010, 11:54:40 pm »
i need someone to give me a vacuum diagram on a 1983 chevy stepside(inline 6-250 engine) if anyone can, my email is haulinb29@yahoo.com---thanx..