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09-04-2009, 02:10 PM
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#1 |
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Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
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Rochester MV Idelt Vent Valve Adjustment
Truck is bogging of idle. One issue may be the idle vent valve - I've searched high and low for a vacuum leak and couldn't find one. Here's a picture of the vent valve - does anyone know how to adjust it? (typical carb for 250 L6)
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Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. Last edited by bluec10; 09-04-2009 at 02:13 PM. Reason: picture won't show |
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09-04-2009, 06:22 PM
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#2 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Rochester MV Idelt Vent Valve Adjustment
Mines adjusted so that it's open slighly at idle and when you move the throttle it closes. That's evidently all it does. Newer carbs didn't have that vent.
Only thing that reduced my 250 from bogging was addition of an HEI and advancing the timing. Still does it somewhat. http://www.thecarburetorshop.com/Troubleshooting.htm |
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