Machman
Well-known member
Hi Guys ;
This is really driving me krazy , I just had a friend over who knows engines well and this had him scratching his head.
We both indepenently think its a possible vacuum leak but not obvious where if this proves correct.
Car is a 1971 w/ a 302 Motor & Auto transmission Carb is a motocraft 2100
When I got the car it was sitting for a while it had a filthy carb w/ lots of sludge in it a couple of tablespoons of rust chunks in the carb from the gas tank , rotton and mis routed vacuum lines , crappy gaskets , and lots of other stuff.
In that state with all those problems it ran after I put a new gas tank and fuel pump and sender in it. When it ran I got a steady idle with the only problem was it was too fast due to the carb high speed choke setting being mis adjusted.
I said to myself great it runs well so I can do all the other work and it should run great.
I rebuilt the carb (the only differences in the carb parts in the rebuild kit was the power valve on the bottom originally had 4 small holes in it and the new one had two large oval holes on the side instead of the 4 smaller ones. The accelerator pump gasket was different as well.
I put new gaskets in the carb and spacer
I cleaned the spacer
I put a new fuel pump in it
I put new vacuum lines in it and properly routed them
I cleaned and gaped all the spark plugs which seem to be incorrect plugs for the car (motorcraft ASF 32C)
Results of all of this
A Very uneven idle with engine wanting to stall if idle is set too low. when warm if I close the choke by hand it revs higher which is opposite what it should.
Spark is strong and present on all cylinders
When I do rev it the engine sounds very strong and revs like it can win any race but idle and stalling totally sucks and car can not be driven.
I also noticed when the car is running that the fuel in the glass filter
gets all sucked down untill the filter is empty then in a second it fills up again and this cycle repeats itself as long as the car is running
I suspect whern I cleaned the carb spacer and freed up long closed off areas this allowed the vacuum leak to occur but am not sure.
Question any ideas what this can be???
Is there a spacer that I can get that will fit the motorcraft 2100 carb ??
This is really driving me krazy , I just had a friend over who knows engines well and this had him scratching his head.
We both indepenently think its a possible vacuum leak but not obvious where if this proves correct.
Car is a 1971 w/ a 302 Motor & Auto transmission Carb is a motocraft 2100
When I got the car it was sitting for a while it had a filthy carb w/ lots of sludge in it a couple of tablespoons of rust chunks in the carb from the gas tank , rotton and mis routed vacuum lines , crappy gaskets , and lots of other stuff.
In that state with all those problems it ran after I put a new gas tank and fuel pump and sender in it. When it ran I got a steady idle with the only problem was it was too fast due to the carb high speed choke setting being mis adjusted.
I said to myself great it runs well so I can do all the other work and it should run great.
I rebuilt the carb (the only differences in the carb parts in the rebuild kit was the power valve on the bottom originally had 4 small holes in it and the new one had two large oval holes on the side instead of the 4 smaller ones. The accelerator pump gasket was different as well.
I put new gaskets in the carb and spacer
I cleaned the spacer
I put a new fuel pump in it
I put new vacuum lines in it and properly routed them
I cleaned and gaped all the spark plugs which seem to be incorrect plugs for the car (motorcraft ASF 32C)
Results of all of this
A Very uneven idle with engine wanting to stall if idle is set too low. when warm if I close the choke by hand it revs higher which is opposite what it should.
Spark is strong and present on all cylinders
When I do rev it the engine sounds very strong and revs like it can win any race but idle and stalling totally sucks and car can not be driven.
I also noticed when the car is running that the fuel in the glass filter
gets all sucked down untill the filter is empty then in a second it fills up again and this cycle repeats itself as long as the car is running
I suspect whern I cleaned the carb spacer and freed up long closed off areas this allowed the vacuum leak to occur but am not sure.
Question any ideas what this can be???
Is there a spacer that I can get that will fit the motorcraft 2100 carb ??
Last edited by a moderator: