OneRotor

iTrader: (3)

So i've searched for the past ~1.5 hours, and have been wrenching trying to figure out what's going on with my 12a. Here are a list of engine mods.

??BP??12a w/ 7k-10k miles
RB Holley 465 4bbl
MSD Coils
Magnacore 10mm wires
e-fan
RB header
RB Duals
Grounding Kit
Fresh NGKBR8EQ14's
Holley Blue pump
-6 Lines
Aeromotive FPG
factory return lines running back to tank
Holley FPR set to 6psi (running)

So here's the issue, and what i've done to try and fix it. When she first fired after the rebuild, I had to keep her floored to achieve 3krpm. My mom showed up in the garage, and I had her hold the carb at full throttle while I came around to work with the carb. I adjusted the mixture with the black plastic thing on the front that reads "lean" around with and has arrows to tell you which direction to turn it to lean out the carb. I finally got her to rev to 7k after she warmed up, but she REFUSES to idle. I set my idle where it was before I rebuilt the carb (fully seat the idle screw then turn it out 4 full turns), and the damn thing STILL won't idle. Then I thought that it sounded like it was missing, so I checked my spark, and I had spark on all 4 plugs . I checked to see if I have 3 puffs per rotor, and I do, so my seals are in tact. What else could it be? The way that I checked my plugs was to pull the trailing lead off of the coil, and then attach a spark plug to each of the leading wires. Spark on both. I then swapped to the trailing coil, and checked the trailing wires. Same thing, spark on both. I have no idea what it could be. I'll try and get her re-started and have someone shoot a video of my exhaust note so I can post it on google or something like that.

OneRotor

iTrader: (3)

link to one video, other one is still uploading...

http://video.google.com/videoplay?do...20630608&hl=en

OneRotor

iTrader: (3)

here is the other video. both videos were 1.5-3k, with the highest spike to ~4500.

Thanks for looking..

http://video.google.com/videoplay?do...89937447&hl=en

K-Tune

iTrader: (26)

sounds really strange. when you look down the the barrels of the carb how is the fuel coming out? also did you try advancing/retarding your timing?

OneRotor

iTrader: (3)

there is plenty of fuel going into the carb. I adjusted it with the lean/rich **** on the front of the carb. I'll check my vacuum advance, but I didn't touch my timing when I rebuilt my carb.

OneRotor

iTrader: (3)

advance lines are hooked up. no rats nest. carb is tight on the manifold with a good gasket, so there shouldn't be any vacuum leaks.

Jaime Enriquez

So you're running a 465cfm Holley on a 12A Bridge? I'd say the carb is way too effin' small for that motor.

Jaime Enriquez

BTW...won't idle cause its brappin' away...or you can't take your foot off the gas becasue it will die.

Rogue_Wulff

Dumb question, but have you checked the float levels?

82BUCKET

iTrader: (4)

I had a 465 kit on my stockport 12A. Is the motor getting enough fuel? Most BP motors I've read about had a 600 on it. Did you check the bowl levels to have sufficient fuel? Just thought I would throw out what I know about the Holley.

OneRotor

iTrader: (3)

i can't take my foot off the gas or it'll die

OneRotor

iTrader: (3)

the PO told me that it's a BP, but i'm not sure i can belive him becasue there's no paperwork to proove it, and he was an idiot.

OneRotor

iTrader: (3)

float levels are right to the bottom of the sight ports (don't have glass sights on it). I have ran it like this for 2+ years with absolutely no problem. The idle just went to hell like that after I rebuilt the carb.

BTW I used a Holley rebuild kit and replaced the floats with brass floats.

OneRotor

iTrader: (3)

yes. I replaced the floats with brass floats, and didn't adjust them (like a noob) before I tried to fire her the first time. It's kind of dangerous when you're shooting 4" gas fountains out of the vent ports on the top of the carb. I adjusted the floats so the levels are at the bottom of the sight ports.

RXnos1200

iTrader: (24)

That black dial you are adjusting is for the choke plate. It's to help start the car up and idles down after it reaches running temperature via the copper tubing going to the exhaust pipe. You sure you don't have an intake leak somewhere?

DanielBlakley

I'd have to agree with RXnos's guess that you might have an intake leak, search for one high and low as they can sometimes be tricky to find...

84stock

iTrader: (5)

You need to adjust the air/fuel screws on the sides of the front metering plate. Perhaps you forgot to install them on the rebuild. Is any fuel coming out of the vent tubes? I agree with the carb being too small for a bridgeport. My 650 is too small for mine, the 870 works so much better up top just needs to get dialed in right.

OneRotor

iTrader: (3)

I didn't remove the metering screws during the rebuild. No fuel is coming out of the vent tubes. There was an aluminum tube that was hooked up to the carb by the choke adjustment, and all it did was go down and sit next to the header. I didn't know what this was for, so I removed it and capped that port with a brass cap. Could this be causing the issue?

OneRotor

iTrader: (3)

Another thing, are the float bowls supposed to be running with the long-axis of the car, or parallel with the axis of the axles? I re-installed my carb with the float bowls how they were before (running parallel with the axis of the axles), but now that 84stock has said that there is a "front" metering plate, i'm second guessing what orientation the carb should be mounted in.

OneRotor

iTrader: (3)

to the top it goes

Rogue_Wulff

If rebuilding the carb is the only thing you done, and it now runs crappy, recheck your work. Both the install of the carb, and the internal carb work. You may find something that was not done quite right. Even pro's can put something together wrong.


Oh, for the record, the holley carb sits sideways on a rotary.

OneRotor

iTrader: (3)

thanks, that's what i thought but i wanted to make sure that I wasn't mistaken. I'm going to adjust the choke tonight when I get home and see if it's all sealed properly to the manifold.

84stock

iTrader: (5)

The fuel bowls should be pointing to each of the front fenders. May look wrong compared to sitting on a v8, but that's the way it goes, otherwise one rotor gets no fuel until the secondaries open. Pretty hard to get this wrong though, it'll only mount one way. Something sounds wrong, like a power valve left off or jets not installed. Open it up, see if one of the jets weren't tight enough and fell out, I made that mistake once.

84stock

iTrader: (5)

Do you have a holley book? You need pics? I have a holley apart in my garage if you need pics.

OneRotor

iTrader: (3)

i don't have a holley book. I took pictures when I rebuilt the carb. I won't be home 'til around 4pm. Could this be caused by not having the aluminum tube that went from the choke acuatory to down by the header?