Got my new 850 Holley #9380 on and runs real bad out of box - Team Camaro Tech
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Old Aug 1st, 09, 10:50 AM
LYK2ROC LYK2ROC is offline
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Question Got my new 850 Holley #9380 on and runs real bad out of box

I think this carb may have an internal vacuum leak. My vacuum gauge is all over the place... Trying to stay steady at 10" but bouncing all over the place. I have all idle mixtures out 2 1/2 turns and it doesn't seem to run any better further out, but it is worse in. I decided to bolt it on to see if it runs okay, and it runs bad, has an erratic idle... I advanced the timing just a hair, and it seemed to help a bit, but not enough... It is also smoking out of the left bank at an idle... It didn't with the other carb, but the other carb wouldn't hold 8" of vacuum, but it was steady. This was the Reman from Holley, but I called the tech line and the guy there said that when they are reman, they are carbs that were turned in for warranty, and then checked over... I am not saying I don't have another problem, but it doesn't run like the other carb did... I will check the floats... it's my daughter's b day, so I didn't have much time to fool with it... What should be my next step? Thank you in advance..

Oh. I also have a heat dissipation plate on it... maybe I should remove it, but I have always ran these...
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  #2  
Old Aug 1st, 09, 11:03 AM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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I think this carb may have an internal vacuum leak. My vacuum gauge is all over the place... Trying to stay steady at 10" but bouncing all over the place. I have all idle mixtures out 2 1/2 turns and it doesn't seem to run any better further out, but it is worse in. I decided to bolt it on to see if it runs okay, and it runs bad, has an erratic idle... I advanced the timing just a hair, and it seemed to help a bit, but not enough... It is also smoking out of the left bank at an idle... It didn't with the other carb, but the other carb wouldn't hold 8" of vacuum, but it was steady. This was the Reman from Holley, but I called the tech line and the guy there said that when they are reman, they are carbs that were turned in for warranty, and then checked over... I am not saying I don't have another problem, but it doesn't run like the other carb did... I will check the floats... it's my daughter's b day, so I didn't have much time to fool with it... What should be my next step? Thank you in advance..

Oh. I also have a heat dissipation plate on it... maybe I should remove it, but I have always ran these...
All vacuum sources are plug on the carb right... The only thing i could think of is the vacuum advance on the dizzy is kicking in to soon (springs on the mechanical may be the answer to light of springs) See what happens when you disconnect the vacuum to the dizzy it should hold a steady vacuum and try turning your mixture screws in until the motor starts to run rough then back it out 1/4 turn on all mixture screws. This will get it close enough but we need to know if the dizzy has some issues.
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Old Aug 1st, 09, 11:10 AM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

Try this as a test to not run a vacuum to the dizzy just plug it off... Then set your timing at idle then check your total at 3000rpm see where your at... Lock it in and set the carb it should clear things up and eliminate the vacuum to the dizzy which will need to be looked at after this test and that will only be the springs easy fix. Some one will chime in and give you a hand as i need to head out for a while but don't give up it sounds like the advance in the dizzy now that your seeing a little more vacuum its bouncing the advance plat around. One last thing if your idle is up to high this will also happen.
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Old Aug 1st, 09, 11:12 AM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

I don't have the vacuum advance hooked up... I have it capped off and locked in at around 36-38 total advance... I prob moved it up a bit when I advanced it a hair.

This Carb only has one live vacuum source, one ported, or vacuum advance source and one for the PCV... It is all hooked up. I tested the PCV... it works..
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Old Aug 1st, 09, 11:22 AM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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I don't have the vacuum advance hooked up... I have it capped off and locked in at around 36-38 total advance... I prob moved it up a bit when I advanced it a hair.

This Carb only has one live vacuum source, one ported, or vacuum advance source and one for the PCV... It is all hooked up. I tested the PCV... it works..
Try to be safe and go 34* locked out... Then try turning your idle down as low as it will go, from here with vacuum gauge hooked up set your mixture screws in until you feel the motor stumble or start to die then turn it back 1/8.. It sounds like the rear idle speed screws may not be opened enough and the primaries idle screw is open to far which means the carb isn't adjusted right and its not idling in the idle circuit.. What are you idling at.
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Old Aug 1st, 09, 12:21 PM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

1000 rpm or so... So... not sure on this 4 corner idle thing... should they different front to rear? The passenger side doesn't seem to do much at all when I screw them in either way... I took the float sight plugs off, and you can't even see the fuel... I assume that I will have to take the bowls off, adjust the floats, and then see where I'm at. I might as well change the power valves to 4.5's while I'm there... It is not holding 10" steady... but I still may have a vacuum leak... somewhere... Thanks for all your help so far... It is greatly appreciated.
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Last edited by LYK2ROC; Aug 1st, 09 at 03:11 PM.
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Old Aug 1st, 09, 03:54 PM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

I forgot to mention that it was majorly perculating also.
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69 Camaro Finally restored. New 496, 700R4, 3200 stall, 3.90 12 bolt posi

http://www.youtube.com/watch?v=vLd6_OZRgCw

http://www.youtube.com/watch?v=tBr--6yBuXM

http://www.youtube.com/watch?v=Xo0SOSKb1NM
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Old Aug 1st, 09, 04:10 PM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

OK im back but cant believe nobody has chimed in yet..

Fist thing is set your timing..

Then set the idle down to as low as possible... 800rpm

Then set the 4-mixture screws evenly in on all 4-at about 1-3/4 to 2 turns out then turn them in one at a time until the motor starts to stumble then back them out 1/16 to 1/8 of a turn.

Then while the motor is running set the floats until fuel starts to dribble out on a rag and its all good.

Then check throttle response and see if you can fine tune the 4-screws in a little bit more.

You may have to spray some carb cleaner in the 4-screws and the air bleed screws at the top of the carb to clear anything out.
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Old Aug 1st, 09, 04:12 PM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

What kind of fuel pump do you have and how much fuel pressure do you have.
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Old Aug 1st, 09, 08:01 PM
Bad67355 Bad67355 is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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Originally Posted by LYK2ROC View Post
1000 rpm or so... So... not sure on this 4 corner idle thing... should they different front to rear? The passenger side doesn't seem to do much at all when I screw them in either way... I took the float sight plugs off, and you can't even see the fuel... I assume that I will have to take the bowls off, adjust the floats, and then see where I'm at. I might as well change the power valves to 4.5's while I'm there... It is not holding 10" steady... but I still may have a vacuum leak... somewhere... Thanks for all your help so far... It is greatly appreciated.
If you screw the idle mixture screws all the way in and nothing happens,you must be pulling fuel from somewhere else.Where are your throttle blades set at in relation to your transfer slot?should be about .020" or look like this[] but no more than .040"
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Old Aug 1st, 09, 08:38 PM
ron498 ron498 is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

What power valves are in it?
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Old Aug 1st, 09, 09:55 PM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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What power valves are in it?
6.5's... I know I need to change them to 4.5's, now, but I just wanted to get it to idle, and make sure I don't have another problem somewhere else.
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69 Camaro Finally restored. New 496, 700R4, 3200 stall, 3.90 12 bolt posi

http://www.youtube.com/watch?v=vLd6_OZRgCw

http://www.youtube.com/watch?v=tBr--6yBuXM

http://www.youtube.com/watch?v=Xo0SOSKb1NM
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Old Aug 1st, 09, 09:56 PM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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Originally Posted by Bad67355 View Post
If you screw the idle mixture screws all the way in and nothing happens,you must be pulling fuel from somewhere else.Where are your throttle blades set at in relation to your transfer slot?should be about .020" or look like this[] but no more than .040"
I haven't checked that yet.. I will when I pull it off again... hppefully tomorrow sometime.
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69 Camaro Finally restored. New 496, 700R4, 3200 stall, 3.90 12 bolt posi

http://www.youtube.com/watch?v=vLd6_OZRgCw

http://www.youtube.com/watch?v=tBr--6yBuXM

http://www.youtube.com/watch?v=Xo0SOSKb1NM
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Old Aug 1st, 09, 10:03 PM
LYK2ROC LYK2ROC is offline
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

Quote:
Originally Posted by Skeeter55 View Post
What kind of fuel pump do you have and how much fuel pressure do you have.
Stock mechanical pump... I am going to change it out, but will that affect the idle, or just wide open throttle? It says I am running around 7 lbs of fuel... and I can't think that would be correct, unless I have a high volume... I bought it over 10 years ago, and swapped it with a Holley Hi-volume pump, which made no difference in the way it run on my 396 back in 2000 or before... It was a Carter... but I don't remember what part # or if it was stock or High Performance... I put it back on when I fired my engine for the first time, because I was getting no fuel, and my Holley took a dump, so I just put on the one I had on the shelf to get it running... but with a 600 or 750 Edelbrock I don't have the erratic vacuum, or an eratic idle... This thing really idles like crap with this carb on it...
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69 Camaro Finally restored. New 496, 700R4, 3200 stall, 3.90 12 bolt posi

http://www.youtube.com/watch?v=vLd6_OZRgCw

http://www.youtube.com/watch?v=tBr--6yBuXM

http://www.youtube.com/watch?v=Xo0SOSKb1NM
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Old Aug 2nd, 09, 08:32 AM
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Default Re: Got my new 850 Holley #9380 on and runs real bad out of box

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Originally Posted by LYK2ROC View Post
Stock mechanical pump... I am going to change it out, but will that affect the idle, or just wide open throttle? It says I am running around 7 lbs of fuel... and I can't think that would be correct, unless I have a high volume... I bought it over 10 years ago, and swapped it with a Holley Hi-volume pump, which made no difference in the way it run on my 396 back in 2000 or before... It was a Carter... but I don't remember what part # or if it was stock or High Performance... I put it back on when I fired my engine for the first time, because I was getting no fuel, and my Holley took a dump, so I just put on the one I had on the shelf to get it running... but with a 600 or 750 Edelbrock I don't have the erratic vacuum, or an eratic idle... This thing really idles like crap with this carb on it...
Pull the carb and start over just like mention above with the transfer slots for the throttle blades and the float level these are extremely important... While you got the carb off clean the small holes air bleeds and in the bowl with carb cleaner and tighten up all screws... Then just set all 4-mixture screws at 1.5-2 turns out.. Make sure that after it fires you adjust the mixture screws back in one at a time until you feel the slightest stumble or rpm drop in the motor, then back it back out 1/16 and do the same to the others... I like to concentrate on the fronts first (primaries) then the rears (secondaries) and these will be very little adjustments 1/16 at a time once you get it to idle right.. The other thing is if your coil is acting up it will give you the same problem at idle like it did with me for 4-weeks until the coil just quit working..

Ignition first, coil, cap, rotor, wires, and plugs.

Fuel second, pressure should be fine, jets, air bleeds, power valve, accelerator pumps, float level and air fuel ration (mixture screws).

It sounds like you have the transfer slots off and float levels plus the mixture screws may be to far out. Its probably got fouled plugs in it now and it will be hard to tune with fouled plugs.
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Last edited by Skeeter55; Aug 2nd, 09 at 08:46 AM.
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