my84firebird

My car has developed a new problem. It only happens on cool nights, and here in Florida it doesn't get to cold. Whenever it gets below say 50*, when I start it in the morning it is really really hard to start and when it finally does, I have to hold the gas to half throttle or it will stall, and it pours out a ton of smoke and acts like its running on 6 or 7 cylinders for a couple seconds and then it will clear up, the smoke goes away, and it will run fine. This only happens after colder nights, and I've read post about "carb icing" and how it doesn't have to be freezing for this to happen. I was thinking of putting in water remover/gas line antifreeze in the tank and seeing if this fixes anything. I've given the car a major tune up, including plugs, wires, thermostat, air filter, fuel filter, EGR, temp sensor, breather, pcv, o2, etc. I haven't done the cap & rotor yet but they look fairly new (just got car last May). Could this be the problem? It's like water/vapor is getting somewhere it shouldn't be..... Someone suggested it may also be the choke, how do you adjust this? I'm new to the whole carb world so any help would be great. Thanks guys........................

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1984 Pontiac Firebird---
LG4, no cat, flowmaster 80 series, open element edelbrock 14", 180* stat, rebuilt 700r4 w/ stage II shift kit, 3.08 open rear. Added new spoiler, new interior including 4th gen seats, new paint job, 16" rims, pioneer 7600 cd player, Viper alarm, keyless entry, and auto-start.

louich

if it is a factory quadrajet, it is likely your choke pull off causing your troubles, if its shooting black smoke and flooding check that, if it doesn't hold vacuum, replace it and adjust it properly..

my84firebird

Sorry, I should have clarified a couple things.

1) its the factory quadrajet

2) it shoots out light grey/white smoke

Let me also add that the last couple days it started up fine, no problem at all, so I'm thinking the temp is the cause since the last 2 days were hot, and it only happens on cold mornings.

So how do you go about adjusting the choke? I'm an idiot as far as carbs, this is my first carbed thirdgen......

thanks guys

85cmroz28

It sounds like the choke pull-off. I believe you cab buy one at advance, auto zone, or napa for like $20. It's real easy to replace, just 2 screws.

chevyrumble83

ya man its something with the choke. do you have to hold your foot half way on the gas untill car worms up?
if its cold outside car will always smoke on start up its normal, and u said that the smoke is a light gray so the colour is right (no leaks)