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98 Toyota 4 Runner 4 cylinder

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Old 08-11-2018, 09:12 AM
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98 Toyota 4 Runner 4 cylinder

Engine light on and codes PO300, PO301 & PO304
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Old 08-11-2018, 11:53 AM
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Those are codes for a miss. P0300 is random general miss, P0301 is cylinder #1 miss, P0304 is cylinder #4 miss.

I would start with the standard tube up items, spark plugs, fuel and air filter, wires, and test coils. The V6s are having age related problems with fuel injectors, Iím nit sure if the 4s are going to as well.
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Old 08-11-2018, 12:08 PM
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Thank you, I put new spark plug wires and spark plugs and air filter last summer, it ran good for awhile then the radiator started leaking at the top and spraying water right on the coils, I bought new plugs and wires but havenít put them in yet. I do not know how to check the coils.
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Old 08-11-2018, 01:28 PM
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This is the link to the V6 diagnostic for ignition coils, Im on my phone so digging for the 4cyl version is cumbersome.

http://www.teamtoyota4x4.org/archivi.../ignsy/ovi.pdf
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Old 08-11-2018, 01:47 PM
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Can test the coils if you have a spark tester that hooks up to the plug wire where it connects to the plug.

Some are adjustable to actually gauge how strong a spark.
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Old 08-12-2018, 08:56 AM
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Coils

Originally Posted by fierohink View Post
This is the link to the V6 diagnostic for ignition coils, Im on my phone so digging for the 4cyl version is cumbersome.

http://www.teamtoyota4x4.org/archivi.../ignsy/ovi.pdf
Thank you, I will check it out.
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Old 08-16-2018, 08:53 PM
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I will assume you have the dual coil pack set up (each coil is for 2 cylinders). There are 3 different ignition set ups for the 3rz.
Using a multi meter, I tested the secondary coil resistance by unplugging the harness from the coils, as well as the spark plug wires, and sticking the leads in the positive/neg terminals- while the engine was cold.
It should read 9.0-15.4k-ohms. Someone please correct that if the ohms is not correct. (Edit: checked my Haynes manual)

Also, i had one injector start to go bad (@200k) and it caused a misfire code as well. Checking your injectors for steady pulse while the engine is running might be a good idea.

Last edited by jreyes94; 08-16-2018 at 09:01 PM. Reason: correct ohms check.
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Old 08-16-2018, 09:05 PM
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98 4Runnner

thank you for the info.
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