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Toyota Repair/1982 toyota pickup 22r skips/backfires after engine warms up

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Question
Good morning Ted. I have a 1982 Toyota half ton truck with the 2.4l 22r engine. 289k miles, 5 speed manual trans. the issue im having is that after the engine warms up, it starts misfiring/skipping/backfiring. If i hold the throttle wide open it will straighten out momentarily, then start doing the same thing again. i have been told that it is prob the ignition coil. i have recently replaced the water pump, fuel filter, plugs and wires, and air filter. I dont want to just start randomly replacing parts if I can help it. Any help is appreciated.

Answer
Hello, you didn't mention distributor cap and rotor, if they were not replaced I would recommend doing so. It could also be a distributor problem and yes, the coil could also cause this, using an ohm meter check the resistance of the distributor pickup coil, should be about 1000 to 1800 ohms with engine hot, this used to be a common problem, check coil resistance, positive terminal to negative should be low about 100 ohms , positive and negative to the high voltage terminal should be high, around 15,000 (15K) or more

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Ted Ritter

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I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.

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Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
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Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified. Toyota technical training: Engine Automatic transmission Manual transmission Drivetrain Electrical systems Brakes and chassis Air conditioning Engine performance and diagnostics Hybrid systems

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