1973 Fj40 wont run after warm up

Joined
Jul 22, 2021
Messages
41
Location
North Georgia
Hi My 1973 FJ 40 has a weber carb with auto choke It starts up and idles great when cold.

After a mile or so it begins to buck and lose power to the point that the gas pedal feels dead. It will restart after cranking for 5-10 secs and drive for about 200 yds and do it again over and over

I put a new coil, inline filter, electric fuel pump None of these made any difference.

I want to go back to the original set up but I don't know who the experts are with the fj40s Any help would be appreciated
Thanks
 

ceylonfj40nut

Waiting for Barn Time
SILVER Star
Joined
Jan 11, 2015
Messages
3,819
Location
TX
Check vacuum on intake manifold with a vacuum gauge. You might have a vacuum leak. You can also spray carb cleaner at the base of carb and intake to see if rpms change at idle. This will tell you whether a vac leak exists.
 

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