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Old 05-11-2017, 08:45 AM   #1
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Question Vacuum leak?

I have had a heck of a time trying to track down a possible vacuum leak .
I have a 451 with Pro systems Carb and nitrous plate,all gaskets have been changed from the intake up to through the carb. The problem i am have is when i take for a drive once i come to a stop it will start to lean to 18-19 AF
It has all new fuel system and filters. I do hear a slight whistle but only when i drive it! I cant get it to do in park or even in gear slightly giving gas.
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Old 05-11-2017, 11:57 AM   #2
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Sounds like its lean all the time?

But just a question. What did you use to seal the intake to the cylinder heads?
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Old 05-11-2017, 12:39 PM   #3
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Permatex Ultra Copper Maximum Temperature RTV Silicone

I have a innovation air fuel gauge,At idle it sits at 12-13 airfuel
I do not hear a leaking sound at idle or even in gear. Im wondering if the whistle is coming from my carb needing more
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Old 05-11-2017, 01:40 PM   #4
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Do you have a different carb to try?
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Old 05-11-2017, 01:44 PM   #5
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If its a Holley knock off and has a power valve it might not be opening.
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Old 05-11-2017, 01:58 PM   #6
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I have a new Holley Dominator 950, I am going to pull my nitrous plate and see if that may be the issue.
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Old 05-11-2017, 03:24 PM   #7
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All 4 Corner Jets are the same size?
and you have all 4 idle air screws turned out the same amounts?

Good Idea on removing the plate till you sort it out...
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Old 05-11-2017, 04:04 PM   #8
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All corners are the same and everything was adjusted evenly.
Im going to slap a smoking gun tonight to see if i can see anything before i pull the plate.
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Old 05-12-2017, 10:51 AM   #9
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Sounds good...

keep us posted..
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Old 05-16-2017, 08:51 AM   #10
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UPDATE!
Well i put my smoking gun with air compressor. The smoke came out of both side of my primary throttle shafts! I ordered a o ring set to plug them.
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Old 05-16-2017, 02:30 PM   #11
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That's kind of to be expected... A little is ok...But not lot a boat load?
Can you pull the carb and install a block off plate and retest it?


Car has Power Brake? Booster could be leaking? or maybe the vacuum actuators inside the car?

Last edited by RacerHog; 05-16-2017 at 02:33 PM.
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