RPM drop and temperature drop

Discussion in 'MAC : Malaysia Airtrek Club' started by David_1978, Jan 6, 2019.

  1. David_1978

    David_1978 New Member

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    Any sifu can advice:
    Took out battery for a week after horn suddenly go berserk..
    After put back the battery, the car engine rpm seems like dropping to below 500 rpm when car going for a complete stop, like stop in front of traffic light.
    When gear in P or N, the rpm is normal.

    And the other thing I notice is the temperature is a bit low... Anyone experience before?
     
  2. vr2turbo

    vr2turbo 5 Year | Silver
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    Taking out the battery for so long, probably ECU reset and now need to relearn......
     
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  3. David_1978

    David_1978 New Member

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    I drove around for few rounds.. do I need to alter the idling?
     
  4. sweelt

    sweelt Well-Known Member

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    anyway if car no suddenly die off drive for few day see ECU is learning and do correcting.
    Dont do anything yet to idle setting.
     
    #4 sweelt, Jan 6, 2019
    Last edited: Jan 7, 2019
  5. sweelt

    sweelt Well-Known Member

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    hahaha...edited. Thanks.
     
  6. vr2turbo

    vr2turbo 5 Year | Silver
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    I think just let it be for a few days, if still low then only adjust......
     
  7. Izso

    Izso Boooooossst
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    Question : Is your car completely stock?
     
  8. David_1978

    David_1978 New Member

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    Yeap... Complete stock
     
  9. sanekit

    sanekit Well-Known Member

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    nothing to worry about coz u remove the battery for a week. like what @vr2turbo said, just drive around for a few days and adjust the idle if it's still low. if the stepper motor problem, your rpm will drop during cold start. my guess is the TCU and ecu was reset hence u see the rpm drop when in D. u can check the tcu rpm idling in D with a handheld obd device. some workshop can even adjust it for u.
     
  10. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
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    need to do ecu relearn..

    normal after removing battery
     
  11. David_1978

    David_1978 New Member

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    Driving around still the same.. at the end, go mechanic increase the idling rpm.. back to normal d... Thanks everyone
     
  12. 4gbanger

    4gbanger 5 Year | Silver

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    the ECU and TCU does relearn after take off battery. but sometimes it doesnt, there's a idle screw at throttle body in case you need to increse idle..
     
  13. sweelt

    sweelt Well-Known Member

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    good TS car back to normal. idle screw kinda help if adjust bit by bit but don get used to it.
    ECU always read rpm and compensate by ISC. Careful or it take you round 360 degree.
     
    #13 sweelt, Jan 17, 2019 at 4:34 PM
    Last edited: Jan 17, 2019 at 5:11 PM
  14. vr2turbo

    vr2turbo 5 Year | Silver
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    Like my old car, cold idling higher, warm up normal, hot lower......:banghead:
     
  15. sanekit

    sanekit Well-Known Member

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    mine after gb swap suka hati idling low or high. sometimes ac on the idling is ok, sometimes low. but isc all working. ahaha
     
  16. vr2turbo

    vr2turbo 5 Year | Silver
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    My ISC ko dy, did a mod using kembara manual isc.....lol
     
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  17. sanekit

    sanekit Well-Known Member

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    or do like @^pomen_GTR^ use 2 ficd. 1 for cold start, 1 for AC. ahaha
     
  18. sweelt

    sweelt Well-Known Member

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    Always crank engine after CEL off. I miss one time, idle below 500rpm. Hahahaha..after few days idle back to normal.
     
  19. sanekit

    sanekit Well-Known Member

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    i think i do that too. but still have wonky idling
     
  20. parakey

    parakey Senior Member
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    Old car CEL initial check takes quite long
     
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