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Author Topic: new carb, new problems?  (Read 2878 times)

Johnny D.

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new carb, new problems?
« on: May 07, 2008, 07:05:31 PM »


so... the car had been running pretty good... untill today.

here is the new issue... i will try to describe the issue exactly as it is occuring...

basically its stalling. it stalls under light throttle (no jokes about heavy foot here... k)

it also stalls when idling at a light, or if you take your foot off the gas and coast, say like in a yielding type situation.

this is bad of course when a light turns and you cant drive away without putting the car in park giving it gas, and then restarting it.

It stalls, usually feeling like the engine is either getting too much air, or not enough gas...

on occasion the carb will burp and spit, in a fore-fire.

the idle screws are set at 1 and a half turns

if you fan the throttle it can be brought back up sometimes...

 its like the RPMs are dropping like crazy, and the motor just peters out.

also

say your driving consistent low speed, 15-30mph car feels like it is pulsing or surging....

I suspect something to do with the fuel or air coming in.

Really Pissed becuase the carb is brand new.

the timing is where Steve left it.

the car does have new wires on it. but these were replaced one at a time and are in correct order.

fuel is 91 octane.

this stinks.

MobStaffCar722008-05-08 00:06:18
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Leaburn Patey

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new carb, new problems?
« Reply #1 on: May 07, 2008, 07:36:31 PM »

Double check the bolts/nuts holding down the carb onto the manifold.
They may have backed off.Seen that happen often.
Check all vacuum lines while you are at it.
Do not mess with the settings Steve has made.
If need be,turn up the idle a wee bit.
Are you sure you got the plug wires on correctly?
Double check your firing order.Having two wires crossed can do what you are describing,IMO
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Johnny D.

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new carb, new problems?
« Reply #2 on: May 07, 2008, 07:41:07 PM »

hey lea, thanks for the advice,

ill check the wires again. the bolts too... but like i said they were done one at a time... so how i messed up is beyond me...

also i should metion it runs out fine past that part begining throttle... highway is good as well as kick down to open the 4 brls


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Johnny D.

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new carb, new problems?
« Reply #3 on: May 08, 2008, 07:47:30 AM »

wires are correct....

turning the idle screw up a bit... helped some

vacuum lines are ok and screws are nice and snung....

now what


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Butch Houghton

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new carb, new problems?
« Reply #4 on: May 08, 2008, 08:07:26 AM »

Since you checked all that try backing the Idle Mixture screws out a bit more.

Try moving one a 1/2 turn out (richer) & see if the RPM picks up....If so do the do the same to the other & repeat the procedure until the engine is at the highest Idle speed attainable with the mixture screws.    Could be as much as 2 1/2 turn after you're done or more.

If it's Idling too high after that turn the curb  Idle speed screw down.

sounds like it's too lean on the Idle circuit.




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Johnny D.

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new carb, new problems?
« Reply #5 on: May 08, 2008, 08:12:24 AM »

idle screws were at about 1 and 3/4 turns...

ill go play with it...

those flame ups through the carb are nasty when you see em...

this might be of importance... not sure
if you do full throttle boot it, i mean to the floor.... car will stall then as well... rather than take off. now I know you dont full throttle from a stop often, but that still that means something is off... right?




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Herman

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new carb, new problems?
« Reply #6 on: May 08, 2008, 12:16:20 PM »

- Accelerator pump might be loose, disconnected or shot.
- Vacuumleak, perhaps the basegasket of the carb.
- Low fuelbowl level.


Steve

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new carb, new problems?
« Reply #7 on: May 08, 2008, 01:40:20 PM »

I agree with Herman
 
The popping is a sure sign of lack of fuel.  That's a dual bowl.  Could be the front bowl is not filling all the way.
 
It's a Holley.  I told you. . . .
 
If you are bringing that up Saturday, I'll take a look at it
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Leaburn Patey

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new carb, new problems?
« Reply #8 on: May 08, 2008, 02:17:45 PM »

Holley carbs are like Fender guitars...
The more you play them hard-the more they go out of tune...
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Matt Aker

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new carb, new problems?
« Reply #9 on: May 08, 2008, 02:30:01 PM »

I hate Holleys...  fer a reason!
 
Get an Eddy John!  You'll be glad you did...
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Mike

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new carb, new problems?
« Reply #10 on: May 08, 2008, 02:41:22 PM »

lol Yoose guys are too late for carb suggestions now, Hes stuck with
it! Steve FYI I don't think you will be seeing that car on saturday 70
bucks to fill that car is a bit much, and all that gas will prob only
last to there and back. 

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Steve

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new carb, new problems?
« Reply #11 on: May 08, 2008, 03:17:42 PM »

I doubt he's been messing with it. . . .
 
I don't know when I can find the time to go down there and look at it.  As you guys know, my plate is stuffed and can't get too far from the nest for a while.
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Stitcherbob

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new carb, new problems?
« Reply #12 on: May 08, 2008, 07:12:24 PM »

Anytime you backfire an older Holley it blows the powervalve inside.....you need a new one and install it here:


http://www.holley.com/data/TechService/Technical/power_valves.pdf

http://www.youtube.com/watch?v=mE_xTUXQJQ8


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Arlen Vander Hoff

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new carb, new problems?
« Reply #13 on: May 08, 2008, 07:20:13 PM »

I think Moe has an Eddy carb for sale,but I know "He's stuck with this one."
I have an Eddy carb and I gotta tell ya I'm not thrilled with it.
But its been working pretty well this year so far since I put premium gas in it. ($$$$$$$)
(Someone gave me a gift card for gas for my B-day.)
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Johnny D.

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new carb, new problems?
« Reply #14 on: May 08, 2008, 07:38:50 PM »


i think amoung other things the engine is just kinda tired... im sure with a freshening up of some parts... some seals, timing chain, it might tighten up some... but she just runs sloppy, tired...

the carb is brand new, so im not sure aboout the powervalve...

770 cfm holley 4brl, two gas lines in....

vacuum lines are all hooked up...

you make an adjust ment and its like wow, this is better, and then in a few miles what went away is back...

not to mention im riding a busted mount still so that doesnt help either... im workin on gettin the good mounts... but it's tough.



MobStaffCar722008-05-09 00:41:16
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