Thanks for choosing FixYa and welcome to the site. There are a few things that can cause a vehicle to run rough. First, check for vacuum leaks. A simple leak can cause a car to act up. Make sure the air filter and fuel filter are not clogged up. If you haven't had a tune up in a long time, it may be that. Replace spark plugs, coils, distributor cap, coil packs. Make sure no wires or hoses have come loose. Check to make sure your pcv valve is not clogged or broke. You might want to flush your coolant as well. Go ahead and change your transmission fluid and filter as well. It is possible that you have a sensor going bad also. Try to pull any codes off the computer that you can. If you can, it may lead you to the root of the problem. If you have any questions, feel free to ask and thanks for using FixYa.
Mine would idle erratic, want to idle too fast or try to die. Exhaust was sooty from over rich fuel mixture and constantly working the throttle at stops to keep engine running. Replacing the "Secondary fuel pump diaphragm" on advice from an Online mechanic solved it. A carburetor kit should include this and is what I did. The secondary diaphragm was indeed damaged.
When was last tune up? Plugs, wires, All fluids & filters - especially fuel filter? I'd start there and run a good fuel system cleaner through it and avoid cheap gas.
SOURCE: Rough idle until warm 22r
if it is a carburated engine it is probably the a.a.p. diaphragm in the carb. if you remove the air cleaner and look on the side of the carb that is towards the valve cover near the front yow will see a vacuum hose going to a cover that is fastened with 3 screws. if you pull the vacuum line off you will see that there is probably fuel being sucked into the line due to the leaking diaphragm. the vacuum source is temp controlled and cuts off when warm. but when cold sucks fuel directly into the intake. remove the 3 screws to replace the diaphragm, being carefull of the spring. good luck!
SOURCE: Where can find a fuse panel diagram for a 1986
You should be able to find a fuse panel diagram in the back of any repair manual(Haynes) which you can get at any auto parts store. The fuse panel in the glove box is for your fan and air conditioning. The other fuse panels are general. Your truck should be a 22r carborated motor unless altered.
SOURCE: 1986 Toyota pickup, Hilux fuel pump
NO the problem most likely is your carb. draining down or accelerator pump not working.
SOURCE: 1986 toyota pickup starts wont stay running
It seems there is some kind of air entering the carburator where its not required to do so or the idling soleniod switch is malfunctioning, thus not allowing the air to enter for the engine to idle .
Also recheck the vaccum pipes if they are correctly refitted per the schematics under the hood.More over remove the idling switch and blow some air to the hole probabley theres some kind of obstruction over there .
Good Luck.
Knight.
SOURCE: 1986 Toyota pickup stereo wiring COLOR CODES NEEDED
Car Radio Battery Constant 12v+ Wire: Blue/Yellow
Car Radio Accessory Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Purple
Right Front Speaker Positive Wire (+): Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: 5 1/4′
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White
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