idle actuator - 146ti - Page 2 - Alfa Romeo Forum
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Paolo Gilardoni
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I have been following the reving of engine problems and am very confused. My 146 1600 Junior has had this problem for the past year, i took it to the main dealers who eventully diagnosed the problem as an idle actuator, which was replaced, but no real improvement. I have recently had the lambda senor replaced and still the car revs up to 1500rpm when sitting at the lights. I have also been told that it could be the mass air sensor. Could some advise me if this needs replacing, or should i disconnect the battery for 36hrs or get the ECU reset by an Alfa specialist. In addition the car has recently aquired a whinning sound which is related to the accelerator, does anyone have a similar problem?
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Chris M - Did you find your ECU reset is still working? My 99 145QV has exhibited the erratic idle and hesitance thorugh 2000-300 rpm since I aqcuired it. To date have been unable to establish route cause or fix this problem (or maybe it's two) I use the same specialist as you, have had the same reset on a few occasions but find it only lasts for about 1 days driving, then she's back to misbehaving - I guess the ECU is simply re-learning its bad habits every time!
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Try resetting it and then driving like your pants are on fire.
None of this 2000rpm dawdling.

If it only does it when hot, try changing your engine temp to ECU sender. About 10.
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Chris S

The car is still running great. I wonder if it's cleaning out all the gunge from inside the throttle body that has really made the difference, as much as the ECU rest. It only takes a couple of minutes to remove the air intake pipe to check. Mine was really bad inside with a build up around the throttle butterfly which must have affected the airflow at idle and the throttle action was also quite stiff/sticky when I checked with the idle actuator off (not recommended).

Good luck
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I bottled out of disconnecting the battery for 36 hours, I was concerned to read on other websites (honest john IIRC) of other makes of car that also lost their immobiliser code when the battery was disconnected for a long time. Today the car went to a local Bosch service agent (found via the Bosch website) and now appears to work fine. He also told me that it is possible to disturb the settings by moving the throttle valve (when cleaning it), apparently it confuses the throttle position sensing. He has also said that the system learns the new parameters over a period of time so that there is some settling in, but so far I've only noticed it edging down from 950 to 750, not diving with the threat of stalling like previously, so at the moment I am happy although 60 poorer for the testing and resetting.
If the rest of you can stand this thread being drawn out any further I'll update you in a few days time to see if it's a 'permanent' fix.

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146ti , actuator , idle

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