[blackasta]

Originally Posted by sawnilrules

There is one particular problem that I am facing, and I am speculating it to the throttle position sensor and the air intake manifold sensor. Even on the idle, the engine rpm keeps going up and down. Just as if in old-school Ambassador of Padmini's with carburettors. Hope you get what I mean here.

It looks like as if someone is slightly feathering the throttle every 2 seconds !
Is this with A/C on? Because when the AC engages / disengages, it results in rpm rising & falling. But again, the frequency of the ups and downs is too much as the AC does not engage / disengage so rapidly.

[sawnilrules]

Originally Posted by blackasta

It looks like as if someone is slightly feathering the throttle every 2 seconds!

Absolutely, for some time, I felt I was sitting in a BEST bus. My foot was absolutely away from the throttle while all this drama was happening.

Originally Posted by blackasta

Is this with A/C on? Because when the AC engages/disengages, it results in rpm rising & falling. But again, the frequency of the ups and downs is too much as the AC does not engage/disengage so rapidly.

Yup, this is with AC on.

I have taken an appointment of coming Saturday at Hyundai, let's see what it turns out to be as per their diagnosis.

[skanchan95]

Originally Posted by sawnilrules

There is one particular problem that I am facing, and I am speculating it to the throttle position sensor and the air intake manifold sensor. Even on the idle, the engine rpm keeps going up and down. Just as if in old-school Ambassador of Padmini's with carburettors. Hope you get what I mean here. Have uploaded a video of the same below..

I faced the exact same RPM fluctuation issue with our Grand i10 Asta(O) 1.2 petrol MT. Throttle body cleaning got rid of the issue.