Question about Toyota 4Runner
It is very possible that this is a software problem, this car uses a system that went into use in 1996 and is the 1st electronic engine control system (known as OBD2) that has the ability to monitor all of the systems that control pollution, misfire monitoring is one such monitored part in the system, software was written to determine when a individual cylinder fell out of the acceptable tolerance of power output and thus triggered a code to be set and the check engine light to come on, many car ,makers including Toyota made the tolerance's to tight and this triggered a misfire code when no real problem exists, to find out if a reprogramme of the PCM (Powertrain Control module) is needed you must contact a Toyota dealer and they can run the symptom on the computer and see if anything shows up, if no need of a reprogramme shows up to fix this issue you do have a problem somewhere in the system whether you fell the misfire or not, the reasons for this can be dirty fuel injectors, engine mechanical wear to rings and valves and a plethora of other issues, only careful testing of the entire engine and systems that control it can determine the actual cause of the misfire. My experience is 30 years as factory trained and certified master tech in electronic engine control theory and operation and repair.
Posted on Oct 07, 2010
The wiring to that coil pack is loose and when it heats up under heavy use (like highway driving) it starts to lose the contact and generates misfires.
Control very thoroughly all electrical connections and tighten all the clamps.
Posted on Oct 06, 2010
Hi! Pretty much a PCM (powertrain control module) problem. The PCM has connectivity on all electrical current that runs inside the car including the engine, transmission, accessories, etc. If the PCM is faulty something will surely fail, one good example is the bad reading on the scanner. Please try to swap PCM and see how it goes. Hope this helps and thank you for using FixYa!
Posted on Oct 06, 2010
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Posted on Jan 02, 2017
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