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Off idle stumble/die. FIXED!

shady

shady

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I've been playing with my buddies cordoba for a while now.... And it has me stumped.
Mopar 360, 2bl, no idea of engine internals, it does appear to have been out once before, and possibly rebuilt.

Starts 'ok' idles great, and if you major grandma it, it'll take of and drive ok.

If you try and take off just like you would on any other given day it stumbles and dies instantly.

Here's what's been done/tried.
Rebuilt carb.
Set accelerator pump per holley recommendations.
Adjusted timing (12 btdc I think).
Checked vaccum and tried adjusting the screws to change/set it.... No change when turning screws :dunno:.
Disconnected and capped all vac lines for testing, no change.
Sprayed starting fluid around the intake... No idle up.

Does it under load, or just in park.
Seems to not do it as much or bad if up to speed for some reason..?

At this point I'm ready to take it somewhere, bit would REALLY like to figure it out instead lol.

Any ideas
 
is there a good squirt from accelerator pump? Also watch down venturi while idling look for fuel dribbling into air stream from the venturi tube, if you this the float level is high. Since you can close the idle mixture screws with no change I suspect you have a rich mixture. Those carter 2 barrels had tendency to warp the air horn, this would allow un-metered fuel to be drawn into venturis. If you remove the air and set on a nice flat steel surface you can tape it with a dead blow, sometimes they will flatten out.
with engine warm Lock the choke open, see if symptom changes.
Also try a different coil wire if weak spark can be an issue. Ask your buddy to hang on to it while you hit the key. If he doesn't do the 2 step across the garage it's weak :rotfl::haha:
 
Lol. He knows better.

It's a holley 2bl. I adjusted the float so that gas just barely trickled out of the hole (the one for float adjustment).
Haven't looked down the carb while pushing throttle yet. I'll try that.

It holds about 15 on the vac gauge, pretty much throughout adjustment. I even bought a new gauge because I thought the old one was broke. It wavers maybe .5 either way.
Started with screws out 1.5 turns. Went a full turn both ways. Then quit because of the lack of change
 
Oh whole different animal. retorque the float bowl. Holley's let fuel past the metering block. Which cam is the accelerator pump using / when you hold throttle wide open, should be @ .015" space between nut and accelerator pump lever. The pump cover lever should start to move the same time the throttle lever starts to move. Is this "rebuilt" carb from a part store ?
 
Forgot, if it has back fired with choke closed the power valve is probably bad. Also the power valve gasket will crack if over tightened. Either will cause a rich mixture.
 
I rebuilt it. Set that gap at .015.

Even tried playing with that gap too, no change. So I re set it.
 
Hasnt popped back through the carb.
 
Guess I could have over tightened something, but I don't think so :dunno:.
 
I keep thinking vacuum leak.
Like bottom side of intake gaskets maybe. Another key I forgot is when you pull the vac advance at idle, also no change.

Things driving me nuts
 
not hard to over tighten the power valve, I mean needs a 1" wrench, normally long for leverage. the jet need to be tight they can draw fuel by the threads, if not tight. If you do pop the bowl off you will probably need a new bowl and metering block gasket
 
Yeah I'm pretty sure the dodge 360 uses ported vacuum for the dist. Does the hose have vacuum at idle?
 
Feels like it. I tried using the one at the front of the carb too.
 
Should change rpm if dist vacuum advance is doing it's job, with vacuum at idle
 
Kinda what I thought.

I'm going to have to try a bunch of crap a second or third time again....:dunno:

Only reason I don't want to take it somewhere is I'm sure they'll dik with it forever and charge us a bunch.
 
What needs to be done to restart it? Just crank? Bury throttle? Little tap?

I have seen some rebuild kits with the wrong accelerator pump wiper in them. More than a few. Really sounds like lack of fuel.
 
Initial start, pull the choke turn it over a couple seconds, it starts, push choke all the way in immediately. And it'll sit there and pur.

After it dies, hit the key quick, no foot pedal, and it fires right back up if it's warm. If it's still cold its a second more of turning over is all.
 
Sounds like it needs more squirter. The fact it fires up easily again means it isn't flooding, rather the opposite. Everything you describe says accel pump issues, either lack of volume, or internal bypass or linkage issues.
 
tRustyK5 said:
Sounds like it needs more squirter. The fact it fires up easily again means it isn't flooding, rather the opposite. Everything you describe says accel pump issues, either lack of volume, or internal bypass or linkage issues.
Click to expand...

I agree. No accelerator pump action for some reason.
 
Working on one of these right now myself. Do you have the 4412 2bbl? Dealing with one on a sandrail. Jetting for altitude first, then working on drivability.
 
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