Thread: no power and smoking

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Vaccume advance? Maybe? My truck wouldn't idle right and it was skipping, etc and was my vac advance from the carb. I pulled it off and plugged the hose up and nothing changed and no vaccume.

I don't know enough to give you an answer that is 100% correct, I am still learning so don't go by what I just said thinking it's right. I am reading and keeping up with this post because I wanna see what your problem is, I am real curious as to why this is happening.

Ok looks like i have found the specific problem. Here is what happened.



So i took my breather off and began to rev the engine. At a slow constant increase it was fine. But when i quicky gave it a lot of gas it made this like popping sound, and looked like air came out of the carb when it made that noise. I took it out for a drive, and once again slow steady increase in throttle and for the most part it was fine. But when i tried to stomp on it, it started to miss again making that popping noise. The noise is no doubt coming from the card. Please help asap.

I think you're confusing the choke plate and the air valve with the throttle plates. If the front ones are wide open the engine is screaming in neutral. The hardest thing in the world is a diagnosis without seeing the engine, take it to a mechanic.

If your running the quadrajet I think the secondairies are controlled by engine vacuum, you might not be making enough vacuum to open them. Try to open them with your finger just to make sure they are not just stuck. Get a shop manual and check all the vacuum lines are hooked up properly. You also might just take some carb cleaner and spray it down real good and make sure everything is clean. You could also check the choke and make sure it is operating properly, if its stuck that could be your problem.

Well now that i know its a problem with the carb i really dont care too much to fix it. But all of your advice is welcome and i will give it a shot. I will be getting an edlebrock performer carb friday which should solve my problems. Unless one of you can give me an idea that cures it-lol. Luckily im only 19 few bills to pay, more mod money-lol

Originally posted by fstrfvo
If your running the quadrajet I think the secondairies are controlled by engine vacuum, you might not be making enough vacuum to open them. Try to open them with your finger just to make sure they are not just stuck. Get a shop manual and check all the vacuum lines are hooked up properly. You also might just take some carb cleaner and spray it down real good and make sure everything is clean. You could also check the choke and make sure it is operating properly, if its stuck that could be your problem.

BTW i opened them by hand and gave it gas and it still had the same problem

If your getting a carb anyways then change it and see if it helps. What size carb are you getting? This is a 350 right? If so then go with a 650 cfm and get Edelbrocks Performer Series intake manifold with that carb and headers all at the same time with the exhaust too. It will help with performance and maybe help gas milage, especially if it's running like crap now then it definetely will. I dont mean no 5 mile to the gallon but you know what I mean.

yea well i adjusted the pull off and that made it run worse. It runs better now at high rpm but worse at low rpm-lol. As for as wat im gonna do is im gonna try to adjust it again and see if i can get it perfect. But now its even running hot. So if that doesnt work then ill be getting a carb this weekend and exhaust and headers this week, for now i hope it works.

I have an 83 malibu with the same problem you are having, it had the original quadrajet on it, and it had no power, it would backfire, misfire, all kinds of problems. I changed it out for an edelbrock 500 cfm with mechanical secondaries, instead of the vacuum secondaries, I jetted it up, put smaller metering rods (for more fuel flow). and It will burn out so incredibly now. If you floor it, it will burn out for about half a second before it shifts into second gear, but it keeps burning out, I have pegged my speedometer at 85mph while sitting still burning out!!!!! My 350 is really hot!