I have a 92 4runner 3.0 it won't stay at 15 mph on dyno keeps like downshifting according to the smog guy any one have this issue first it couldn't get to 25 fast enough now it won't stay at 15 also replaced the throttle body any info would be appreciated thanks

 

If your 92 4Runner 3.0 is having trouble maintaining a steady 15 mph on the dyno, constantly "downshifting" according to the smog technician, the most likely culprits are issues with your transmission, throttle body, or potentially a faulty TPS (Throttle Position Sensor), which could be causing the engine to not receive the correct signal to maintain a steady power output at low speeds.

 

Low transmission fluid: Check the transmission fluid level and ensure it's within the proper range. Low fluid can cause shifting issues at low speeds.

Worn transmission components: Worn clutch plates, low-pressure seals, or worn out bands could lead to slippage, causing the engine to "downshift" to maintain speed.

Faulty transmission control module (TCM): If your 4Runner has a TCM, a malfunction could lead to erratic shifting behavior.

 

Keep me posted if you do any of these bud. Cheers

 

I've replaced throttle body the old one was all messed up and the IAC was bad allegedly but it drives better than before I've been leaning towards transmission as well I've replaced fluid and it's full I do see a leak tho but hard to tell where it's coming from since everything is ˟˟˟˟ing leaking I'll check the tcm thanks for the point in a direction

 

Found this red wire rigged
wondering where the green wire goes

 

it drives better than before I've been leaning towards transmission as well I've replaced fluid and it's full I do see a leak tho but hard to tell where it's coming from since everything is ˟˟˟˟ing leaking I'll check the tcm thanks for the point in a direction