Carb adjustments

[Anonymous]

does anyone...anyone at all know how to adjust a 1BBl carb on a 200cid? please help.

 

[CZLN6]

Howdy backyardpb:

But what are you working on? What carb? What year 200 engine? In what car? What trans? These things make a difference.

In general, start by a complete disassemble, a thorough cleaning, and a new rebuild. Make sure the float is correctly set and that the air screw is preset at 1 1/2 turns out.

Next, start the car. Make sure there are no vacuum or gas leaks. If there are fix them 1st. Then assess the ignition system. If all is well there set the initial advance to specs plus another 5 degrees.

You'll be working with two adjustments; the idle screw and the low speed air screw. Start the engine and make sure that it is completely warmed up and that the choke is in the full open position. Start by setting the idle rpm as low as possible. Now slowly, 1/4 turn at a time, turn the air screw out. If idle rpm goes up, turn the screw out another quarter turn. Continue this process until the idle rpm no longer goes up.

Now readjust the idle to the lowest possible rpm. Then began turning the air screw slowly in until you hear the slightest stumble or drop in rpm. then back the screw out enough to regain a smooth steady idle.

You have just adjusted your one barrel carb. Enjoy!

Adios, David

 

[Anonymous]

Thanks David. The car im working on is a 1982 Ford Granada. with a 3.3l I6. The engine burns rich. The choke opens too. You said make sure there are no gas leaks. Just recentley I noticed that I had droplets of fuel coming out the fuel pump. Will this effect the way the engine runs? Will your handbook cover a 1982 ford granada I6?

 

[CZLN6]

Howdy Back:

The Performance Handbook will cover your 200 engine quite well, when you're ready for more major improvements. It make general performance suggestion that you will find helpful to get the most out of your stock engine.

You're working with a a Holley Model #1940 carb. I have very little personal experience with them. Earlier versions had the air and idle screw adjustments I mentions previously, but some of the later ( '81 and '82) had sealed air screw adjustments as per EPA requirements. If you have an auto trans you will likely have some sort of solenoid idle adjustment to keep the throttle from closing too fast too. If this is the case you may have to modify the thing to make it tuneable. It is worth doing and not contrary to EPA regulations for vehicles over 10 years old and/or over 50,000 miles.

Your best bet may be to buy a quality rebuild kit and read the directions thoroughly, as well as study the drawing. My Chilton's manual doesn't do a very good job covering these carbs and engines.

The leaking fuel pump may not effect the way the engine runs, but it is extremely dangerous and wasteful. Not to mention not very environmentally friendly.

Start by fixing the fuel pump gas leak, and buying a rebuild kit for your carb. How long since this carb has had a rebuild and kit?

Adios, David

Adios, David

 

[Anonymous]

Im not quite sure if its ever had a rebuild. The car hs sat for awhile so im definietly going to do rebuild the carb. I think its sealed to. And too top it off I asked my dad and he stated the my grandfather put a completely different carb on it. Then he stated that maby he didnt. now im stuck with the question of is this the orig. carb? I cant ask my grandfather either seeing how hes passed away.