Hard to start/Brake problem
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New User
Joined: Aug 2000
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From: Virginia
Hard to start/Brake problem
I have an 84 Bronco II, 2.8 carbed V-6, 4x4. The truck is hard to start after it sits a while. The fuel pump is 3 years old. I just changed the fuel filter on the carb yesterday. I found very little gas in the filter, which seemed very unusual. It is like the gas is siphoning out of the carb bowl some how. The carb was rebuilt two years ago. Once the truck is started, it is easy to start up shortly after shtting it off. The longer it sits, the harder it is to get started again. Let it sit for a week, and I have to use ether to get it to kick off. The truck is not run much, as I am in the Navy and have been gone for the last nine months.
I have also noticed a problem with the power brakes. When the engine rpm is high, plenty of vacuum, the power brakes work normal. When the engine idles down, stopping at a red light, the brakes get much harder. It takes a lot of effort to stop the truck at slow speeds, whereas at high speeds the brake pedal takes very little pressure. As my two sons will be driving this truck, I want to get both of these problems fixes. TIA.
Chuck
I have also noticed a problem with the power brakes. When the engine rpm is high, plenty of vacuum, the power brakes work normal. When the engine idles down, stopping at a red light, the brakes get much harder. It takes a lot of effort to stop the truck at slow speeds, whereas at high speeds the brake pedal takes very little pressure. As my two sons will be driving this truck, I want to get both of these problems fixes. TIA.
Chuck
Mountain Pass
Joined: Apr 2003
Posts: 230
Likes: 1
Hard to start/Brake problem
As far as the carb problem,thats either the float set wrong in the carb or fuel pump is going bad,not enough pressure to fill the carb bowl,usualy a good mechanic shop will do a fuel pressure test either free or dirt cheep for you.
As far as the brake problem,most likely the power brake booster is goin bad,i replaced mine on it(86 BII),it had rust hole in the back of the booster where you couldnt see,also made it hard to start at times & run a little rough because it was leaking vacuum,if you replace the booster,replace the master cylinder on the front it too,when you put a new booster on it,it pushes the the cylinder in the master cylinder further than it has been worn,thus,causing a leaks in back of it & the leaking brake fluid will ruin the seal on your new booster.
The paper work in the booster will also tell you that if you do not replace with a new master cylinder,the warranty is void.
Oh,since you must not know,dont use ether in that engine no more,it will destroy pistons & valves in a gas engine,if needed,just pour a little gas in the carb to get it started
As far as the brake problem,most likely the power brake booster is goin bad,i replaced mine on it(86 BII),it had rust hole in the back of the booster where you couldnt see,also made it hard to start at times & run a little rough because it was leaking vacuum,if you replace the booster,replace the master cylinder on the front it too,when you put a new booster on it,it pushes the the cylinder in the master cylinder further than it has been worn,thus,causing a leaks in back of it & the leaking brake fluid will ruin the seal on your new booster.
The paper work in the booster will also tell you that if you do not replace with a new master cylinder,the warranty is void.
Oh,since you must not know,dont use ether in that engine no more,it will destroy pistons & valves in a gas engine,if needed,just pour a little gas in the carb to get it started
Thread Starter
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New User
Joined: Aug 2000
Posts: 20
Likes: 0
From: Virginia
Hard to start/Brake problem
I checked the float in the carb, found it to be too low. Adjusted the float, and the engine starts much better now! Thanks for the help.
The power brake booster holds a good vacuum, so I don't think it is a problem. What would be the best way to check out the master cylinder and the power brake booster to find the brake problem?
Chuck
The power brake booster holds a good vacuum, so I don't think it is a problem. What would be the best way to check out the master cylinder and the power brake booster to find the brake problem?
Chuck
