I am having a real bear of a time getting my freshly rebuilt motor to start and run. The motor was completely rebuilt and I have confirmed compression and leakdown. The ignition is a DUI version which seems to be giving spark consistently. Cranking timing is 9 degrees. Plugs are new and properly gapped. I do not think it is an ignition issue.
I also rebuilt the carb and set the various settings to what I found in my FSM and on this site. Gas is fresh and stays at the mid-mark on the sight window.
I have had it start and run for a few seconds a few times but as I corrected an overly-advanced ignition and various carb screw throttle, mix and choke settings I am admitting I need some help finding the proper methodical, orderly approach to getting it to start and run.
I started with 1.5 turns out on the air correction screw. I tried it at various settings from there with no success.
I started with 1.5 turns in past contact with the throttle screw. I tried it at various settings from there with no success.
I started with no choke and then in with various settings from there with no success.
I started with no pre-start pumps of the accelerator, then 1, then 2 with no success.
I tried "starter fluid" in the carb with no change.
I am running 2 big batteries in combination, it spins freely and there is plenty of current.
I know its getting gas in the cylinders: I can smell it on the plugs after trying to start.
The "best" results I can get are with 1.5 turns out of the idle air, 2 turns in on the throttle screw at idle, 2 pumps of the accelerator before starting. It will then usually start and sputter maybe 10-12 cylinder-fires. No amount of full or no throttle seems to keep it alive.
I feel like I am now just hunting in the dark now and would have to be very lucky to get the right combination of variables correct...
What is the proper order in which to adjust and diagnose the various things we do so start and run when starting from scratch? I think ignition is good...but what order of idle air correction, throttle screw, choke, pre-start pumps, etc and in which direction should I attempt?
1974 FJ40 with "F1.5" and stock Aisin carb, "RV" cam grind, DUI distributor, anything else needed to help diagnose?
Thanks everyone in advance!
I also rebuilt the carb and set the various settings to what I found in my FSM and on this site. Gas is fresh and stays at the mid-mark on the sight window.
I have had it start and run for a few seconds a few times but as I corrected an overly-advanced ignition and various carb screw throttle, mix and choke settings I am admitting I need some help finding the proper methodical, orderly approach to getting it to start and run.
I started with 1.5 turns out on the air correction screw. I tried it at various settings from there with no success.
I started with 1.5 turns in past contact with the throttle screw. I tried it at various settings from there with no success.
I started with no choke and then in with various settings from there with no success.
I started with no pre-start pumps of the accelerator, then 1, then 2 with no success.
I tried "starter fluid" in the carb with no change.
I am running 2 big batteries in combination, it spins freely and there is plenty of current.
I know its getting gas in the cylinders: I can smell it on the plugs after trying to start.
The "best" results I can get are with 1.5 turns out of the idle air, 2 turns in on the throttle screw at idle, 2 pumps of the accelerator before starting. It will then usually start and sputter maybe 10-12 cylinder-fires. No amount of full or no throttle seems to keep it alive.
I feel like I am now just hunting in the dark now and would have to be very lucky to get the right combination of variables correct...
What is the proper order in which to adjust and diagnose the various things we do so start and run when starting from scratch? I think ignition is good...but what order of idle air correction, throttle screw, choke, pre-start pumps, etc and in which direction should I attempt?
1974 FJ40 with "F1.5" and stock Aisin carb, "RV" cam grind, DUI distributor, anything else needed to help diagnose?
Thanks everyone in advance!