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post #1 of 32 (permalink) Old 06-01-2011, 11:25 PM Thread Starter

 
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I hate car carburetors!

Seriously, the carb on my '75 Vette is getting me very upset. Anyone want to come and make this thing run for me. I pay in cash.

Ran ok before we started working on it in January. Rebuilt the carb, put her on, and trying to follow online instructions on how to properly adjust/tune this thing is making me pull my hair out.

Been at it for a week and a half now (while fixing other issues), trying to have it ready for this weekend, and totally lost.



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post #2 of 32 (permalink) Old 06-01-2011, 11:33 PM

 
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what is it doing?

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post #3 of 32 (permalink) Old 06-01-2011, 11:40 PM

 
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what carb is on it?

I know a carb guy or 2...

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post #4 of 32 (permalink) Old 06-01-2011, 11:45 PM
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*pops hood*

Hmmm, see right here, this right here is your problem:


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post #5 of 32 (permalink) Old 06-02-2011, 12:00 AM Thread Starter

 
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It's a Holley 4150. Pretty common carb. 650cfm. PO stated it was a 750 buy my research shows its a 750.

It's doing a bunch of different things.

Ran well before. Meaning, we turned it on, drove it around, it didn't die, didn't run ideally but didn't die.

Now, I'm trying to follow instructions from the interwebz and sometimes it'll idle correctly, sometimes it seems like its leaking vacuum somewhere, sometimes it seems perfect then you put it in gear and it dies, then it's running ok but you put the air filter on and it dies, etc.

Can't get it to just be right on all aspects (idle, curb idle, while on the gas, etc).

We rebuilt the carb, so we knows it's all good from a parts standpoint, and knew I was in for some fun in tuning it, but didn't expect it to be so frustrating.

I'm not kidding, if someone can come check this thing out, I pay cash.




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post #6 of 32 (permalink) Old 06-02-2011, 12:01 AM Thread Starter

 
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*pops hood*

Hmmm, see right here, this right here is your problem:

That'd scare the crap outta me. But that dog looks sweet.

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post #7 of 32 (permalink) Old 06-02-2011, 12:02 AM
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did you use a new mounting flange gasket?

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post #8 of 32 (permalink) Old 06-02-2011, 12:02 AM Thread Starter

 
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what carb is on it?

I know a carb guy or 2...

BTW lotta vendors in this thread...
CLSB Vendors are great aren't they!?!

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post #9 of 32 (permalink) Old 06-02-2011, 12:03 AM Thread Starter

 
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Quote:
Originally Posted by Pilotx1 View Post
did you use a new mounting flange gasket?
Yes, all new gaskets all around, including the mounting flange gasket.

Also, I'm using a tach meter hooked up in the engine and a vacuum guage while trying to adjust this thing.

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post #10 of 32 (permalink) Old 06-02-2011, 12:16 AM
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im out of ideas, no real experience with auto carbs...

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post #11 of 32 (permalink) Old 06-02-2011, 12:18 AM

 
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how far is this car located from your office?

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post #12 of 32 (permalink) Old 06-02-2011, 12:27 AM Thread Starter

 
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15 min.

Basically I355 and Maple Ave exit.

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post #13 of 32 (permalink) Old 06-02-2011, 12:28 AM Thread Starter

 
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im out of ideas, no real experience with auto carbs...
Thanks for trying though. The base gasket was one of the first things recommended to make sure is correct on a Vette forum I browse.

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post #14 of 32 (permalink) Old 06-02-2011, 12:51 AM
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Mebbe that crossfire fuel injection is preferred after all.
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post #15 of 32 (permalink) Old 06-02-2011, 12:51 AM

 
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Float level would be my first check.
Also check that the float needle is shutting off and not hung up some how.

If it dies when you put on the filter and cover I'd guess it's rich.

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post #16 of 32 (permalink) Old 06-02-2011, 02:31 AM
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what kind of a fuel pump does it have?


bad mechanical fuel pump could stave it. possible you buy a new chinese mechanical fuel pump. but i never worked in manufacturing since I was 19 so i dont know.



get a propane torch, and let it gas out near vacuum hoses and the carb. and see if it idles better. helps you find the vacuum leak.



if your vacuum gage, you try to get the highest vacuum, then make it drop by 1 by turnng it in 1/2 turn(about)




they dont teach carbs in scope school anymore. so its a lost art. also make sure that automatic choke is working.




BTW, is that teflon tape on the fuel rail into the carb fittings? if it is, remove it and clean your carb out.
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post #17 of 32 (permalink) Old 06-02-2011, 07:35 AM
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Quote:
Originally Posted by taledarkside View Post
what kind of a fuel pump does it have?

bad mechanical fuel pump could stave it. possible you buy a new chinese mechanical fuel pump. but i never worked in manufacturing since I was 19 so i dont know.

get a propane torch, and let it gas out near vacuum hoses and the carb. and see if it idles better. helps you find the vacuum leak.

if your vacuum gage, you try to get the highest vacuum, then make it drop by 1 by turnng it in 1/2 turn(about)

they dont teach carbs in scope school anymore. so its a lost art. also make sure that automatic choke is working.

BTW, is that teflon tape on the fuel rail into the carb fittings? if it is, remove it and clean your carb out.

Pete, what ever u do, don't listen to the ramblings from this retard or u might set the car on fire.

The #1 is when u tore apart the carb, did u replace with the same exact jet numbers? I've never known holly carbs to cause major issues. So it's entirely possable you don't have thing correct internally. You might be better off looking for a "quick fuels" carb as they are really well designed and preset from factory. But it's possible your jets r Incorrect.

But your best bet, and fastest would be just to buy a new carb. And again, call and talk to quick fuels about their carbs. Most people get the wrong jets n carb for their cars and make incorrect adjustments causing them to run like dogshit. I'm not there and I have far too much going on, or else I'd swing by to try to help ya dude. I suggest u talk to Brandon (boosted_gsxr) on here n see if he has free time to swing by after work as he may b able to help u. He is not on here often, so let me know n I can text him n c if he can help u

...plus my gf was with me saying "omg slow down, slow down" and I was thinking "Lose annoying squalk box in passenger seat, afford more mods and have less weight in the car and on the back of the bike"...so i dumped her and I'm single again as usual...HERE KITTY KITTY!!!
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post #18 of 32 (permalink) Old 06-02-2011, 07:46 AM
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Check to make sure you have the right fuel pressure feeding the carb. Check float level. Adjust idle high enough so that it runs and either use starting fluid to spray in short bursts around to find vac leak. You can use carb cleaner but it will just make it die instead of run high in rpm like starting fluid.

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post #19 of 32 (permalink) Old 06-02-2011, 10:20 AM Thread Starter

 
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Thanks folks.

I did the carb cleaner trick (according to some people it should increase the rpm, and not make it die, so I don't know), but, it actually didn't do anything. Couldn't find any vac leaks. I will however try it starting fluid and maybe wd40 around the base, as I didn't shoot that yet, only around all the vac fittings and anything I could think of.

Thunderstruck, the carb was put back exactly as it was taken apart as far as I can recollect. No leftover parts is good right?!? Yes, please do text boosted and see if he's available.

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post #20 of 32 (permalink) Old 06-02-2011, 10:23 AM Thread Starter

 
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Quote:
Originally Posted by resurrection View Post
Float level would be my first check.
Also check that the float needle is shutting off and not hung up some how.

If it dies when you put on the filter and cover I'd guess it's rich.
Did check the float level last night, seemed good.

How would I check if the float needle is getting stuck?

Thanks.

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post #21 of 32 (permalink) Old 06-02-2011, 12:46 PM
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Quote:
Originally Posted by Thunderstruck View Post
Pete, what ever u do, don't listen to the ramblings from this retard or u might set the car on fire.

The #1 is when u tore apart the carb, did u replace with the same exact jet numbers? I've never known holly carbs to cause major issues. So it's entirely possable you don't have thing correct internally. You might be better off looking for a "quick fuels" carb as they are really well designed and preset from factory. But it's possible your jets r Incorrect.

But your best bet, and fastest would be just to buy a new carb. And again, call and talk to quick fuels about their carbs. Most people get the wrong jets n carb for their cars and make incorrect adjustments causing them to run like dogshit. I'm not there and I have far too much going on, or else I'd swing by to try to help ya dude. I suggest u talk to Brandon (boosted_gsxr) on here n see if he has free time to swing by after work as he may b able to help u. He is not on here often, so let me know n I can text him n c if he can help u




buy a new carb fawking funny
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post #22 of 32 (permalink) Old 06-02-2011, 01:23 PM

 
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Wow you two should fight this out so the rest of us can get on with our lives.

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post #23 of 32 (permalink) Old 06-02-2011, 01:49 PM
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It's a Holley
There's your problem.
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post #24 of 32 (permalink) Old 06-02-2011, 01:56 PM
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There's your problem.
Really? I thought they were one of the best.

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post #25 of 32 (permalink) Old 06-02-2011, 03:02 PM
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Really? I thought they were one of the best.
In my experience, Edelbrock is where it's at for the street. We do a lot of work on street rods and muscle cars. My boss is the carburetor guy and I've seen quite a few cars that he has spent lots of time trying to get a Holley to run right only to give up and put an Edelbrock on it. We have taken Holleys off of brand new crate engines and replaced them with Edelbrocks before even starting the car.
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post #26 of 32 (permalink) Old 06-02-2011, 06:26 PM
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I texted him dude. Sent me a pm with your cell and I'll pass it on

...plus my gf was with me saying "omg slow down, slow down" and I was thinking "Lose annoying squalk box in passenger seat, afford more mods and have less weight in the car and on the back of the bike"...so i dumped her and I'm single again as usual...HERE KITTY KITTY!!!
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post #27 of 32 (permalink) Old 06-02-2011, 10:18 PM
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Quote:
Originally Posted by Ryan View Post
In my experience, Edelbrock is where it's at for the street. We do a lot of work on street rods and muscle cars. My boss is the carburetor guy and I've seen quite a few cars that he has spent lots of time trying to get a Holley to run right only to give up and put an Edelbrock on it. We have taken Holleys off of brand new crate engines and replaced them with Edelbrocks before even starting the car.
This, Edelbrock's are designed to be driven on a daily basis. Holley's are a PAIN IN THE ASS....let me rephrase that, CARBS ARE A PAIN IN THE ASS. I had an edelbrock on my last truck and the thing ran beautifully once i got the right needles and jets for the secondaries.

I have a couple of questions though, since the last time it ran what have you done to the motor? That will greatly affect your jetting and airflow at idle. Make sure your EGR block off plate isn't leaking either. Have you tried inserting a screw driver to hold the choke off?

I've done more carbs then i'd care to and still am not very good at them. I can't figure out why the Merlcarb(2 barrel rochester) on my boat leaks fuel after shutting the engine off.

Last edited by HndaTch627; 06-02-2011 at 11:09 PM.
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post #28 of 32 (permalink) Old 06-03-2011, 12:56 AM
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This, Edelbrock's are designed to be driven on a daily basis. Holley's are a PAIN IN THE ASS....let me rephrase that, CARBS ARE A PAIN IN THE ASS. I had an edelbrock on my last truck and the thing ran beautifully once i got the right needles and jets for the secondaries.

I have a couple of questions though, since the last time it ran what have you done to the motor? That will greatly affect your jetting and airflow at idle. Make sure your EGR block off plate isn't leaking either. Have you tried inserting a screw driver to hold the choke off?

I've done more carbs then i'd care to and still am not very good at them. I can't figure out why the Merlcarb(2 barrel rochester) on my boat leaks fuel after shutting the engine off.

what, carbs are eazy. almost no moving parts. the harder ones are the late model carbs that got all the emissions crap.


crack in casting, bad float setting, bad float seating, bad gas cap
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post #29 of 32 (permalink) Old 06-03-2011, 05:59 AM
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How you found us: SBN
           
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Originally Posted by Ryan View Post
There's your problem.
beats the crap off the rochester

Live Fast, Die Young, Have a good looking corpse.
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post #30 of 32 (permalink) Old 06-03-2011, 07:42 AM
Thee original azzhole!
 
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Join Date: Nov 2004
Location: bartlett
Posts: 6,912
Location: bartlett
Sportbike: 97 900rr-rip 09/09, 69 chevelle SS, & ???
Years Riding: it doesnt matter
How you found us: i see all
           
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Brandon said he could look at the carb if u bring it to him, but he's not sure when he can get to it tho. Sorry dude.

...plus my gf was with me saying "omg slow down, slow down" and I was thinking "Lose annoying squalk box in passenger seat, afford more mods and have less weight in the car and on the back of the bike"...so i dumped her and I'm single again as usual...HERE KITTY KITTY!!!
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pussy is the root of all evil...
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Originally Posted by Hunny View Post
mmmm pussy
You dont like me....i dont give a fuck...cause i'll still put ya in the hospital...me tollerating you is all that matters...
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