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December 16th, 2008, 05:46 AM
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#1 (permalink) |
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Registered User
Join Date: Feb 2008
Location: Great White North.
Posts: 50
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Air fuel problems
I have a 70 W31 engine with the original quadrajet carb.When dyno tested the A/F readings were ranging from 7 to 9. Just a bit rich.Any suggestions (except from Norm) would be appreciated.Thanks.
__________________
70 W31 in progress (Currently trying to put the innards back together after it was held hostage by a scumbag body shop owner.) 
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December 16th, 2008, 07:35 AM
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#2 (permalink) |
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Registered User
Join Date: Nov 2008
Location: Central Fl
Posts: 163
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Air/Fuel
Gotta check a bunch of stuff, the bowl plugs, they normally leak, fuel pressure, yes the primaries do have metering rods, are they sticking etc. Needle and seat, good condition, set right? If possible try another carb on it. Or you maybe have to send it out to a more competent rebuilder. Good luck!
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December 16th, 2008, 08:37 AM
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#3 (permalink) |
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Oldsdruid
Join Date: Dec 2007
Location: Danville Vajenya, the Last Capital of Dixie
Posts: 1,214
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W31 shouldn't have primary metering rods, unless everything the factory put out about them is a lie...
Are these A/F readings at WOT or thruout pull range?
__________________
I know absolutely nothing about Oldsmobiles. Just ask the owner of Oldspower.com |
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December 16th, 2008, 11:18 AM
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#4 (permalink) |
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Registered User
Join Date: Nov 2008
Location: Central Fl
Posts: 163
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Air/Fuel
Sorry guys, every Quadrajet I've ever seen had primary metering rods. My mistake.
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December 18th, 2008, 05:12 AM
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#5 (permalink) |
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Registered User
Join Date: Feb 2008
Location: Great White North.
Posts: 50
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It probably doesn't interest too many,but, on runs three days apart, the following results were obtained.On the first day the readings ranged from 11.4 to 14.0. Three days later (same secondary rods and same hanger) it ranged 7.8 to 9.8 with rpm range from 3000 t0 5500.
His explanation was different atmospheric pressure or air density or maybe tooth fairy dust.  I'have to believe that his test instrumentation needs calibrating/overhauling! Any comments welcome.
__________________
70 W31 in progress (Currently trying to put the innards back together after it was held hostage by a scumbag body shop owner.)
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