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7/2/12 10:17pm - Original Message: 'DISTRIBUTOR VACUUM ADVANCE !!!'
JC VETTE 70
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, - Canada

Vette(s):
70 VETTE 350/300HP, AUTOMATIC, ALL STOCK EXCEPT FOR MILD CAM,LAGUNA GREY, 3:55 POSI GEARS

Joined: 3/9/2008
Posts: 159
Car been missing a few times after I accelerate from a  stop. Checked all distributor wires and coil wires seem fine. When i disconnect the distributor vacuum advance hose car runs fine, what can be causing this? Can i run it with the hose off?

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7/2/12 11:06pm - Reply: 'Re: DISTRIBUTOR VACUUM ADVANCE !!!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19448
Sounds like the timing may be off. Where is the advance getting the vacuum? From the front/bottom of the carb, or from somewhere else? Need to determine if it is ported, or straight vacuum.
Ported vac. would be from anywhere above the throttle plates, and straight vac. would be from anywhere below the throttle plates.


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Joel Adams
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7/3/12 4:50pm - Reply: 'Re: DISTRIBUTOR VACUUM ADVANCE !!!'
JC VETTE 70
Standard Member
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, - Canada

Vette(s):
70 VETTE 350/300HP, AUTOMATIC, ALL STOCK EXCEPT FOR MILD CAM,LAGUNA GREY, 3:55 POSI GEARS

Joined: 3/9/2008
Posts: 159
Front bottom and i believe straight vac.

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7/3/12 8:50pm - Reply: 'Re: DISTRIBUTOR VACUUM ADVANCE !!!'
JohnRR
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Joined: 2/22/2011
Posts: 110
You can run without the vacuum advance hose connected, but your gas mileage will suffer.  Something else to consider is that the vacuum advance device on your distributor, or the hose,may be bad(leaking) and causing a vacuum leak. 

John


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1973 BB 4-Speed Coupe Project Car
2009 Z06 Mostly Stock
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8/5/12 3:20pm - Reply: 'Re: DISTRIBUTOR VACUUM ADVANCE !!!'
JC VETTE 70
Standard Member
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, - Canada

Vette(s):
70 VETTE 350/300HP, AUTOMATIC, ALL STOCK EXCEPT FOR MILD CAM,LAGUNA GREY, 3:55 POSI GEARS

Joined: 3/9/2008
Posts: 159
Found the problem...it was a faulty  pertronix ignitor. Runs fine nowSmile

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