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Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4179
Experience:  Toyota Master Tech, ASE Certified
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94 toyota 4runner: reman..injectors,and mass air flow..lean

Customer Question

94 toyota 4runner,3.0 v6.new reman engine,injectors,and mass air flow. code reads dts25 - continous lean mixture.plugs are wet and black.no power and idles rough. maybe a bad sensor?
Submitted: 7 years ago.
Category: Toyota
Expert:  Ted Ritter replied 7 years ago.
The dtc code 25 is a oxygen sensor code, the problem is probably not the sensor, it is merely recting to a problem with the engine, since it's idling rough there may be an engine misfire which will cause the check engine light to turn on because of the lean condition. The misfire could be caused by a number of things, since the engine is a remanufactured unit it would seem logical to rule out a mechanical problem. Here are some things that should be checked: An intake air leak, a vacuum leak, possibly a vacuum hose disconnected or connected wrong, a malfunctioning EGR system,spark plug wires. Try to isolate which cylinder is causing the problem and concentrate on that cylinder, short out each spark plug wire for each cylinder, the cylinder that causes no change in the way the engine runs is the one that hs the problem.If you post a follow up please let me know what else has been done, if anything besides the above mentioned items. If nothing else can be found then it's possible that the O2 sensor could be the problem but it should be tested to see if the output voltages of the sensor are correct.

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