The car is 1999 S70 GLT with ~177,000 miles on odometer.
The symptoms are:
1) Sometimes the car stops reacting on gas pedal and barely runs at ~600rpm. This condition lasts for ~20 sec to 1 min. After that it goes back to normal. No check engine light, no trouble codes.
2) Sometimes rpm starts changing on its own. It jumps roughly within 600 up to 2000 a couple of times. After that it goes back to normal.
3) Sometimes (more rarely) the car
- a) first experiences either #1, #2 or both and
b) after that it starts reacting on gas pedal again but performance is very poor. Idle is very low ~600rpm. It barely accelerates. 0 to 30mph takes ~1minute.
c) When this happens, OBDLink (my blue tooth OBD2 adapter) stops registering any changes in throttle position. It stays perfectly constant even though the car can be revved up. Other live data signals seem to be as usual.
d) ETS light comes on.
e) If I shut the car down for a few minutes it goes back to normal. ETS light goes away after it runs for ~20 seconds after restart.
f) No trouble codes and no freeze frame present. At least nothing readable by OBDLink.
5) With the throttle out of the car if I move the plate by hand and observe throttle position live data, the position signal is perfectly monotonic with 0 fully closed, 100 fully open and default position being 20.
6) I'm not sure if it is related to the problem but my long term fuel trim now is at +11.
7) When either condition happens, I don't notice behaviour changes in short or long fuel trims.
Are these definitely the symptoms of throttle module failure, can it be something else, or something besides of the throttle module?
Even though I see no discontinuities in throttle sensor readings, can it still be just a worn potentiometer issue?
If the module fails internally, what might it be?
I'd appreciate any advice! Thank you!
