1973 STEP A SIDE

iTrader: (4)

Got every thing back together and fired it up . I am so rich at idle you cant stand it . Tore it down reset every thing and still way to rich . I started it for the first time with pill #1 . Today after going through the carb I changed to pill #6 and still to rich .
#1 Should I change the air bleed it has #70 in there now .

#2 Drill the butterfly's

I have been reading a lot about Quick Fuel on other forums and every one I read that had this kind of problem but no one seemed to follow through and fix the problem .

HELP !!!!

1973 STEP A SIDE

iTrader: (4)

The build .

Quick Fuel HR-680-VS
Edelbrock Intake #71187 Performer RPM LS1 Duel Plane Manifold
MSD Ignition Controller#6010
As Cast PRC Stage 2.5 5.3L CNC Ported Heads Milled .017
GM 5.3L Multi-Layer Steel Head Gasket #28-12589226
MR45676 1 ¾” ceramic coated long tube headers 3" collectors
GM Gen III Cylinder Head Bolt Kit #28-12498545
GM ls2 Timing Chain # 12586482
Comp Cam ***** Thumpr 283THR7 High Performance Street/Strip
Melling 10296 Oil Pump
Moroso GM LS Valley Plate
GM LH8 Pan Kit #19212593
3" duels to stock location (behind rear tires) Flowmaster with H pipe .

1973 STEP A SIDE

iTrader: (4)

Am I asking to much ???

speedtigger

iTrader: (16)

Did you try replacing the power valve? Also, how many turns out are the idle mixture screws? Are there 2 screws or four?

TXsilverado

iTrader: (18)

does it not have idle mixture screws? I don't drill the blades to lean it up at idle.


throw the pills away and set a custom timing map. the pills keep the timing too low IMO

speedtigger

iTrader: (16)

Some engines require a larger volume of air than can be supplied through the idle circuits without exposing too much of the transfer slot. That is why the new Ultras from Holley have the new bleed screw. However, I doubt that is the case in the OPs situation.

1973 STEP A SIDE

iTrader: (4)

speedtigger Only pulling 5 on the vacuum gauge so I added 2.5 power valves . Also 1 full turn on all 4 mixture screws .

TXsilverado Waiting on my adapter to plug into my laptop . Pill #6 is 800 RPM *20 I would think that should be enough .

speedtigger

iTrader: (16)

5"? How much camshaft is in this engine?

Also, as you turn the idle mixture screws in or closed, it will lean out the idle. Have you tried this?

1973 STEP A SIDE

iTrader: (4)

speedtigger Its got Comp Cam ***** Thumpr in it . Lift Int. 564 Ex. 547

Lobe Separation 109

I can not do any thing to the engine for a day or 2 as I took the truck to the trans shop to have them adjust the 700R4 .

Also thanks for the help .

TXsilverado

iTrader: (18)

the idle feed restictors are a hair big on my quick fuel which makes the idle screws hyper sensitive. I think I only have my idle screws backed out 1/2 turn on all 4 corners to get a 13.5 AFR idle.

1973 STEP A SIDE

iTrader: (4)

TXsilverado Hopefully I get that truck back tomorrow and get the vacuum gauge out and to a little screw turning . Thanks !!!

Has any one added bigger air bleed jets ?

TXsilverado

iTrader: (18)

I recommend that you get a wideband to tune along with your vacuum gauge. before changing anything, work the idle mixture screws. if the idle mixture screws are hyper sensitive, and the off idle tip in goes super rich I would think you need smaller idle feed restrictors. don't change anything blind though.

1973 STEP A SIDE

iTrader: (4)

So what would be a good map to set up with ?