Thats why i said it was a anti diesel solenoid. But tgrease seems to know all. I already know the proper way to change the idle on these carbs. Its done by the solenoids bolt thats attached to a spring. Not by the (idle) screw on the throttle lever.
this can happen, also the choke mechanism on the other side can be binding if there is not enough clearance or if the fast idle cam get stuck as one of the lever is plastic and can break... as we are talking about the motorcraft 21xx series carburetor.marc wrote: ↑Wed Apr 07, 2021 9:50 am Michael, now you have me wondering if the stronger throttle return spring might be working against the solenoid and could it be contributing to the difficulty starting the j10. Takes four cranks to start, when I got it, it started right up but it was idling very fast, leaking vacuum as well as oil and the timing was way out. Easy enough to put the old spring back in and see if it makes a difference.
marc wrote: ↑Mon Apr 05, 2021 3:58 pm Do you have the original air cleaner setup and does it have "vacuum motors" on the various trap doors like my 84 j10. Two major vacuum leaks turned out to be the vacuum choke pull off and the vacuum motor on the door in the air cleaner that diverts air flow to come from the manifold stove. The former I replaced and the latter I removed, pried apart and fixed the diaphragm with thin bike tire repair tape, a narrow strip around each side of he fold. Put it back together and peanned and compressed the rim back in place. When I got the truck it was idling at 1200 rpm, dieseling often.
The other odd thing was that the idle often would not go back to 600 rpm, it would go to 700 or 800. You could easily push the throttle back to the normal idle. I believe the throttle return springs were so loose that it was too easy for friction to catch the throttle. Put on a heavier spring on and that helps.
We have carb... and the idle can indeed varies greatly upon temperature, humidity... My motorcycle with 3 carbs has the same issues, specs is 1200, but can go to 1400 or barely 1000... I am only concerned if it stalls...candymancan wrote: ↑Fri Apr 09, 2021 11:07 am This i habe noticed. I can tap the gas pedal when its all warmed up.. and idle will be at say oh i dunno lets say 600rpm. Then when drive and let go of the pedal slowely and then come to a stop. Idle will be at 700 or 750rpm.. then if i tap the throttle quickly itll go back to 600.
Its like its getting stuck or something