General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

1984 Ford Ranger: looking for Carburetor

  #1  
Old 03-08-2019
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1984 Ford Ranger: looking for Carburetor

HI I recently bought a 1985 Ford Ranger in great condition (pictured below) It doesnt run very well in the cold though and it has been suggested to me it will run better with a carburetor that has no electric parts. Does anyone have any suggestions about where to look for these parts:

1984 or earlier Ford Ranger truck or Bronco with a 2.8 motor: carburetor, and ignition distributor, dura spark box and the connector between the distributor and the box (good used condition)


Cheers,

Savannah


 
  #2  
Old 03-08-2019
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Nice clean 1984, good find

2.8l V6 was not a bad engine, just older technology now-a-days

The carburetor used was a Motorcraft 2150A, the A denotes it was a "feedback carb" used with a computer
Motorcraft 2150 would be the standard carb, no computer

You can rebuild these, info here: Motorcraft 2150 2V Carburetor

But if its a cold running issue you may just need to adjust the Choke
On the 2150A you may need to drill out the set rivets on the choke adjust cap and put in self tapping screws

There were 3 different kinds of choke activation used, but the cap rotated to adjust any type

First see if it is a Choke issue
On cold engine, do not touch gas pedal, and remove air cleaner so you can see the choke plate, should be wide open straight up and down from last time you drove it
Now open throttle on the side of carb and watch choke plate, it should close, the colder it is the more it should close
If its not closing or not closing very much then something is wrong

All gasoline engines need to be Choked, even fuel injected engines
Liquid Gasoline can't be ignited by a spark, yes the movie guys take liberties, lol
Only gasoline VAPOR will ignite using a spark
Thats what compression is for in an engine, compression = HEAT and heat helps vaporize the liquid gasoline
You need about 30% Vapor in a cylinder to get a good ignition

When an engine is cold so is the gasoline in the carb or fuel lines, and maybe it only has about 10% vapor, if you smell gasoline you are smelling the vapor, and most know cold gasoline doesn't smell as much as warm gasoline, so much less vapor when cold

This is where the choke plate comes in
Engine pulls in air, and fuel via Jets in carb, when cranking
When you restrict the air flow with a choke plate you increase the fuel flow from the Jets
So to get the 30% minimum vapor level from 10% vapor gasoline you need to suck in 3 times more fuel
And it is a balancing act for sure, because too much liquid gasoline will Flood the engine

If choke plate is not closing enough then it may take several cranks to get some ignition, cylinders are warming up from compression every time you crank, and eventually you may reach that 30% vapor point for ignition
But engine may also stumble and stall because not all cylinders are working
Choke plate closing also set higher idle, need this because even choked the engine can't run at lower RPMs

So that cap on the side of the carb has a spring behind it, you rotate the cap to close the choke plate more, or to open it more when spring is cold
Then tighten up the cap
After engine starts that spring is warmed up electrically or by exhaust, that causes the spring to expand and that OPENS the choke plate slowly as engine needs less fuel vapor and more air
 
  #3  
Old 03-09-2019
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HI, thanks for your reply. I'm not much of a mechanic so please excuse any ignorant questions..The person working on my truck says that it is not a choke issue. Given this are you saying that he can rebuild the current carburetor (2150A) so that it functions like the older carburetor (2150)...? Just to re-iterate, the current carburetor is functioning but the truck does not start up and run well in the cold and it has been suggested to me that the older type of carburetor without the computer controls will run better.
 

Last edited by Savannah; 03-09-2019 at 11:20 PM.
  #4  
Old 03-10-2019
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Location: Pennsylvania
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The conflict is that you state it is not a choke issue, but cold starting and running is what the choke is for. Given that carbs have become even more of a black art than they were when they were common, it is hard to assume the choke has been correctly ruled out. Wanting to remove the computer controls of a system that isn't understood and isn't working properly is a pretty typical reaction, but seldom leads anywhere beneficial.
 
  #5  
Old 03-10-2019
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Location: newport, mich
Posts: 149
Originally Posted by 8thTon View Post
The conflict is that you state it is not a choke issue, but cold starting and running is what the choke is for. Given that carbs have become even more of a black art than they were when they were common, it is hard to assume the choke has been correctly ruled out. Wanting to remove the computer controls of a system that isn't understood and isn't working properly is a pretty typical reaction, but seldom leads anywhere beneficial.

U make an awesome point here, Id say somebody needs to find someone else to work on their stuff here...
 
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