Holley running EXTREMELY rich
#3221362
03/19/24 08:54 AM
03/19/24 08:54 AM
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Joined: Aug 2003
Posts: 8,828
Houston, Tx
hemi68charger
OP
master
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OP
master
Joined: Aug 2003
Posts: 8,828
Houston, Tx
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Hey gang...
Car: 71 440 six pack Challenger RT
Situation: The motor is idling EXTREMELY rich, black smoke out the exhaust and running really rough at idle. The outboard carbs have been disconnected to eliminate them. None of the 3 carbs has fuel flowing out the booster ventures at idle which typically means high float level. Metering block fuel/air mixture screws only about 1 turn out. My gut says the new power valve from a basic rebuild kit is bad. The car was running fine earlier, so the ignition and timing haven't changed.
TroyHouston Mopar Connection Club'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)
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Re: Holley running EXTREMELY rich
[Re: hemi68charger]
#3221370
03/19/24 09:15 AM
03/19/24 09:15 AM
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Joined: Jan 2003
Posts: 13,362
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,362
Marion, South Carolina [><]
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I agree w/ the power valve being bad.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Holley running EXTREMELY rich
[Re: Cab_Burge]
#3221544
03/19/24 09:37 PM
03/19/24 09:37 PM
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Joined: Jun 2014
Posts: 3,176
Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,176
Md.
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I agree w/ the power valve being bad. Maybe   I've seen the power valve gaskets kink and cause the same thing  Yep, been there done that. Check that gasket.
America First!
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Re: Holley running EXTREMELY rich
[Re: rickraw]
#3221596
03/20/24 06:47 AM
03/20/24 06:47 AM
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Joined: Nov 2003
Posts: 1,839
NW Indiana
fbs63
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,839
NW Indiana
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Pull a vacuum test to see if if it holds. . Have you checked vacuum at idle? What rating power valve is in there? Maybe there's not enough vacuum at idle to hold it closed.
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