New Carb for 80 Turbo Regal

['80RegalT-type]

Does anyone know of an aftermarket carb that would work with my 80 turbo regal. I had a "quadrajet specialist" in my area rebuild my stock carb and it doesn't want to idle, runs rich, chokes doesn't work. I've tried adjusting the idle screws and speed and it gets a little better but not drivable. At 800 rpm's I have 20 inches of steady vacuum so i don't think i have a leak. This is my first motor rebuild and my 71 GS is dying so i need a new daily driver.

 

[83build-up]

HOW did you measure vac. if it won't idle? 800 rpm is still a little low if it's in park.it should be around 1000.when you adjusted the idle was the engine warm?There should be no reason you should have to change the carb if it was rebuilt right.Take it back to who rebuilt it and have them adjust the carb.if you did use a aftermarket carb you would have to have the power valve referance reworked so it could be external and referanced after the turbo instead of before it otherwise it WILL go lean under boost and thats because the turbo creates a vacuum as it pulls from the carb hence the power valve will not open when it should because it thinks the engine is at a lower throttle or even a idle and won't put out the fuel you would need.that's why it's usually easier to stick with the factory set-up.I would try to work with what you got before you trash it.Just because you have 20inches of vac doesn't mean that you don't have any vac. leaks.With all the vac lines on these things i'd check them all.actually have vac leaks could cause it to idle poor and run RICH as most seem it would lean it out.Depending on were the leak is and how bad it might be if the engine is pulling air from somewere other then the carb it could cause the power valve in the carb to start dumping fuel into the engine because the vac though the carb would be low because of it getting air from another source.And low vacuum is what causes the power valve to open in the first place hence the whole reason it would take some work to use a aftermarket carb.and if the power valve is opening due to a vac.leak it will run rich.One way you can tell is with the car running at a idle or best it can look into the primarys were the choke is and see if there is any fuel being dumped into the carb,you will see little droplets coming from the venturies,if it is doing this either the float is set wrong in the carb or the power valve is prematurly opening posibly because of vac leaks.I would also check you EGR valve and make sure it's not stuck open that would cause it to do the same thing and make sure the EGR has NO vac at a idle.make sure the guy used the right gaskets when he rebuilt it.Most likley you will find it to be something stupid that caused this whole mess in the first place.Make sure all vac lines are in there proper place.

 

['80RegalT-type]

Well it will idle for a bit then it dies unless i give it a little gas. I can turn my idle screws all the way in and the car still runs. Vacuum leak? When I get the car to idle pretty good i put it in drive and it goes down to 500 rpms and wants to die. I'm going to pull the carb off tomorrow and take a look at it. See if I can spot anything. I don't have the EGR hooked up, can i just take it off and put a block off plate?

 

[83build-up]

IT's possible the carb is dumping fuel if you turn the screws all the way in and it still runs.the idle should be set at 1000rpm in park so when you put it in drive it will go to 800rpm it prob.will die at only 500rpm's way to low.you could remove the EGR and block it off.before you pull the carb let the car runand see if it's dumping fuel like i explained in the last post.

 

['80RegalT-type]

I checked the carb to see if it was dumping fuel like you said. It was but only on the left side. The idle screws were set the same on both sides. I turned them in all the way when the car was warm and It started missing but still ran. I got it to run at 1000 rpm's just fine, but once i put it in gear it drops to 500. I pulled the egr off and it was full of oil. I put a block off plate on but it didnt' change anything. I pulled that carb off and checked it out, everything seemed in order.

 

[83build-up]

Start checking vac. lines pcv valve,breathers,but most likely the oil on the egr isn't oil at all but raw fuel soaking into carbon deposits that were allready there giving it a oil looking substance.I still say there's probably a vac leak or the carb's float isn't set right,or you have a power valve problem.I will have to get one of my books out and look and see how your set up is to be more exact.It's been awhile since I have worked on a carb without a MC sil. on it.or one with one for that matter.There definatly seems to be to much fuel getting into the engine now we will just have to figure out why.I'll look into it and get back to ya.But meanwhile make sure there's know restriction in the exhaust like a converter blocked.is there black smoke when the engine is running?

 

['80RegalT-type]

It's got a brand new PCV and most of the vacuum lines are gone for things like the smog pump and such. It's definitely oil that was in the egr. There is no exhaust on the car except for a 2 foot downpipe so there is no blocked cat. I have no pecv valve at the moment. I've tried hooking the power valve to a timed vacuum port but it doesn't change anything. When i rebuilt the motor i did put a slightly bigger cam in, dunno if that would do this.

 

[b4black]

If there is no PECV valve, then the power is open all the time and the carb will always run very rich.

You might be able to connect the power valve port on the carb directly to the intake. Use a check valve so it can only see vacuum and not pressure (boost).

A lot of the emissions equipement help driveability, not just exhaust emissions. Maybe something inportant is disconnected.

The best investment you can make for troubleshooting a carb is another carb (even a not-so-good one). If two carbs do the same thing, it's probably something else. Get a junkyard Q-jet, and it doesn't have to be a turbo V6 carb.

 

['80RegalT-type]

I'll try switching carbs. I guess it's convenient that my friend just put a street avenger on his 78 cutlass and he said i can have is
Q-jet. I'll get back to ya when I try that. Thanks for the help.

 

['80RegalT-type]

Well, I put my friends quadrajet on. So much black smoke, it was disgusting. I know the quadrajet was running or my friends car. So it seems it's not the carb. I put my old one on and looked at the venturis like you said and it was dripping fuel in. I'm checking right now for vacuum leaks. I pulled everything off the intake and i'm going to recheck and reinstall.

 

[Peter]

Try checking the foat level, and the sealing of the float needle. Either can cause a rich mixture. PECV is also required as per B4B.