Q: My truck is losing rpms and throwing no codes
As i am driving or idling it will run fine and accelerate fore 5 to 10 min then it starts dropping rpms and when i rev it drops its top out and wont rev pas 2 to 1,000 rpms especially when i want to hit 50, i have replaced, map, tps, fuel filter, distributor and cap and rotor , sparks and wires, coolant temp, fuel pump, alternator and battery, and still does this.
My car has 1998679 miles.
My car's transmission is unknown to me.
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Given the age and mileage, you might want to start with a basic cylinder compression test to see what the mechanical condition of the engine is. Although there are many possible causes of the power loss you are describing, a partial list would include oxygen sensors, vacuum leaks, ignition system malfunctions, bad valve timing if the timing belt or chain is worn or skipped, blocked exhaust (e.g., catalytic converter fails or becomes clogged), airflow sensor, and so forth. Whatever the cause, if you request an engine loss of power diagnostic, a certified mechanic will get this resolved, and right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
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