RPM drop and temperature drop

[David_1978]

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?

 

[vr2turbo]

Taking out the battery for so long, probably ECU reset and now need to relearn......

 

[David_1978]

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

 

[sweelt]

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

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.

 

[sweelt]

You're in the MAC sub-forum

hahaha...edited. Thanks.

 

[vr2turbo]

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

I think just let it be for a few days, if still low then only adjust......

 

[Izso]

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?

Question : Is your car completely stock?

 

[David_1978]

Yeap... Complete stock

 

[sanekit]

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.

 

[^pomen_GTR^]

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?

need to do ecu relearn..

normal after removing battery

 

[David_1978]

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

 

[4gbanger]

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..

 

[sweelt]

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..

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.

 

[vr2turbo]

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.

Like my old car, cold idling higher, warm up normal, hot lower......

 

[sanekit]

Like my old car, cold idling higher, warm up normal, hot lower......

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