So, my early (April) 1972 FJ40 has a hard start issue and would appreciate some guidance for next steps. Short problem explanation is: I have to crank the engine excessively, 8 to 12 times or more, for 10 to 15 seconds each before I get a little ‘rump-rump; and again several more times before it will actually start; or maybe start. This is with the choke pulled out. Once it does start it runs pretty well. Maybe a little white smoke for a minute or less while warming up but that’s it. Odd thing to me is that if I drop a little gas directly into the carb, even if the truck has sat for several days, it starts up almost immediately. I thought maybe a potentially bad (45 year old) fuel pump might be the issue so disconnected the fuel line at the carb and hosed it into a bucket and it’s dumping plenty of clean fuel. I’m leaning toward this being an idle solenoid issue but my carb knowledge is weak. It clicks if I apply 12v and assumed it was working but maybe not. Its literally like something is stopping the flow of fuel with the key on 'start', but not when on 'run'. Not sure what else I can do to check and can’t seem to find one online to replace it short of buying a whole used carb.
The carb is stock and according to pictures I’ve seen is the correct one for an early 72. Fuel is new and premium grade. The vacuum checks out good, could find no leaks and ~17+ at 625 rpm idle, timing done with a light is ~ 10 degrees (ball near the bottom of the window and sounds good by ear too) which was recommended somewhere when using the Pertronix II with the stock vacuum retard dizzy, plugs gapped right, wires good, and like I said, it runs good with no hesitation on acceleration and smooth idle when I do get it started. If it sits for an hour or so after running, it will re-start with little effort. Sitting over night or after a few days I’m back to cranking…
Carbs have always confused / scared me, but am figuring this is what I should be focused on at this point? Don’t know where else to look but totally unsure how to test it further. Any suggestions appreciated.
Bob
The carb is stock and according to pictures I’ve seen is the correct one for an early 72. Fuel is new and premium grade. The vacuum checks out good, could find no leaks and ~17+ at 625 rpm idle, timing done with a light is ~ 10 degrees (ball near the bottom of the window and sounds good by ear too) which was recommended somewhere when using the Pertronix II with the stock vacuum retard dizzy, plugs gapped right, wires good, and like I said, it runs good with no hesitation on acceleration and smooth idle when I do get it started. If it sits for an hour or so after running, it will re-start with little effort. Sitting over night or after a few days I’m back to cranking…
Carbs have always confused / scared me, but am figuring this is what I should be focused on at this point? Don’t know where else to look but totally unsure how to test it further. Any suggestions appreciated.
Bob