I felt that when i maintain speed 120 km/hr the rpm of the engine starts increasing and reaches up to 4000/min.
I guess that you have a manual transmission. If that is the case you have a clutch on the way out. Slow slippage that gets worse as the plate gets hotter. If an automatic it is possible that the overdrive is not holding due to low pressure in the box. Have a pressure test done on the box--- have the fault codes read. From experience 120 kph is around 3200rpm for most cars and the 800 rpm difference indicates that the o/dive is not working as it should.
SOURCE: Constant high pitched whining noise. Increases
you could be low on transmission fluid check that and make sure it registering properly on the dipstick.
SOURCE: while driving fine at low speed it shook and
get a trouble code from Autozone or other store for free. It sounds like a sensor problem to me. The Idle Position sensor for example.
Testimonial: "thanks, no sparkplug or fuel injection problems?"
SOURCE: dtc 12 engine speed(rpm) sensor circuit ecm toyota
The RPM sending unit circuit is not sending right data to the ecm.
SOURCE: after cleaning the throttle body it looks to be
When you cleaned the throttle body, did you remove the Idle Air Control valve/motor (IAC)? A dirty or defective IAC can be the result of your problems. The IOAC regulates your vehicles idling under various condictions. Try cleaning it first then replace if needed.
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