I bought a 1987 Mazda B2200 regular cab, long bed 5 speed Standard with little less than 40,000 miles last month for 500.00. The previous owner told me she had to turn screw on the carburetor to get the engine to rev up more. She has to do this sometimes. It stalls on me sometimes when i slow down at a stop light. Could the screw that periodically needs adjusting on the carb have a spring that is worn out? That is what my dad thinks as he is a retired desiel mechanic. It also gets bad gas milage in town driving and could it be from the problem stated above?
There are two screws, high idle, and a base idle. You use high idle when the air conditioner is running, or you've started the engine cold, and it's coming up to operating temperature. The base idle controls everything else. Your carburetor probably needs rebuilt, those screws are preset from the factory to be in their proper positions. All kinds of gunk is probably in there if it's the original carb.
It doesn't have ac and it stalls out when the truck is at operating temperature. It sounds like it is reving up too much when at a stop light for example. It should get 22mpg from what i read online, but it eats the gas up faster than my wife's 2019 Chevy Impala with a v6. Also everything on the truck is original even the radio. Lol
It also gets bad gas milage in town driving and could it be from the problem stated above?
Carburetors don't get good gas mileage. My Ranger is a 1999 and it only gets 19 MPG on the highway.
That's because it's either fuel injected or direction injected, which is all done by a computer. You're talking about a mechanical device.
I had a 1973 Chevy C10 1/2 ton reg. cab, long bed 2wd 3 speed on column with a 250 carb engine that got 14mpg. The Mazda truck eats fuel faster than my Chevy i used to have. I haven't done a milage check yet to see what i get.
The carb probably needs rebuilt. Carburetors aren't made to last forever. You shouldn't need to mess with screws. Any rubber has long since started to deteriorate, ethanol in gasoline just makes it worse.
Thanks. I will tell my dad what you said and see what he thinks. It's ok for now to drive it the way it is until someday i get it fixed before my dad goes to Florida for the winter after hunting season in Maine
Go to Mike's carburetor parts, it's a website. It's a popular design, so they should still make parts for them.