I just got a brand new carb put in with a stepper motor, the stepper motor does not work - does this mean the brains of the jeep is the prob or is it something else causing this to not function properly?
SOURCE: 1988 jeep wrangler carb trouble
Ok... If you have any experience with carbs, you can get a rebuild kit. The most important part of any rebuild is to clean out obstructions in the passageways. Most times this can be done by using carb cleaner and spraying compressed air through them.Most times, just spraying cleaner into carb while installed is a waste of time as debris usually consists mainly of fine rust particles from inside the fuel tank, which will remain in the fuel bowl unless physically removed. If you can't do this, next best option is to search local junkyards for a similar unit. When replacing, cut the fuel line in a convenient place ahead of the carb inlet and put an aftermarket filter in the line, to prevent debris from re-entering and causing further problems. Most carbs have the adjustments blocked off. before using, it is wise to have someone who knows how to remove those plugs, do this for you so you can adjust it after installed.
Good luck
SOURCE: Back firing thru carb in 1985 Grand Wagoneer new rebuilt engine
check your firing order as well as your timing
SOURCE: 89 jeep yj wont keep running
If it's not injected, the idle circuit in the carb either isn't adjusted properly or is plugged, or the float level is too low. A vacuum leak can also do that.
SOURCE: 1987 jeep wrangle will not start or run
Uncouple the fuel line coming from the pump at the carburetor, place a clean can under the line, and have someone operate the starter--you should have fuel shoot from the line in spurts as the engine turns. If it does, then the entry port on the carburetor is plugged. Remove the float assembly and pull out the float needle valve. Hook the fuel line back to the carburetor and try the starter again, there should be fuel pumping into the float bowl. If not, check to see if there is a filter on the fuel inlet path that may be plugged. If no filter, remove the float needle seat to see if something is blocking the fuel passage. If all else fails, use compressed air to blow backwards through the needle seat (remove the fuel line again). Hope some of this helps!
SOURCE: INSTALLED NEW CARB ON AN 88 JEEP HOW DO I ADJUST
Adjustment screw is usually capped and non accessible unless you drill it out. If you are lucky and get one without a cap attach a vacuum gauge and tach to the engine and turn the screw out or in 'till you reach the highest steady rpm and vacuum reading, then turn it back about an eighth of a turn. After you have done that, adjust the throttle stop to the correct idle rpm.
The adjustment screw is always located in the base (mounting) plate of the carb.
Testimonial: "GOOD ADVICE BUT I HAVE 2 ADJ. SCREWS"
Operation
The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle valve. The servo valve is opened or closed by the activation of the stepper motor (incorporated within the idle air control motor in the forward or reverse direction. Battery positive voltage is supplied, by way of the MFI relay, to the coil of the stepper motor. The engine control module switches ON the power transistors (located within the engine control module) in sequential order, and, when current flows to the stepper motor coil, the stepper motor is activated in the forward or reverse direction.
Removal & Installation
Testing
Checking Coil Resistance
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