Cultus 2008 Idle RPM very high after throttle body service

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aminjafer5441 (Amin Jafer) 2019-12-16 22:32:30 +0500 #1

Hi everyone. I own a cultus model 2008 and recently serviced the throttle body as idle RPM was too low and occasionally the engine would even stall when idling.
After service the car ran fine for 2 days but now the idle RPM is a bit too high, like on CNG it goes to 1000 RPM and on petrol around 1200 to 1300 RPM. I tried resetting the ECU by disconnecting battery but the issue remains.
The car has thermostat installed and the idle remain high even after engine has obtained optimal temperature.

I request any experience member to guide me regarding this issue as the mechanics here in Islamabad are a complete rip-off.

nnabeel (nnabeel) 2019-12-17 11:04:45 +0500 #2

This happens. It will came back to normal idle after running 200-300 kms.

One of my frind had his baleno throttle service done, he faced the similar issue but it got better after running of 200-300 kms.

aminjafer5441 (Amin Jafer) 2019-12-17 20:48:12 +0500 #3

I hope mine does too. But actually car has been driven over 300 kilometers at least and idle RPM still remains high.

alijanbaloch39 (Alijan Baloch) 2019-12-19 14:41:09 +0500 #4

Actually the throttle isn't service properly it needs to be cleaned properly or get checkup by another good mechanic i also faced that issue with my cultus actually it may be the problem of sensor which controlls the rpm of car and its installed on the throttle or may be it needs to be cleaned properly.

aminjafer5441 (Amin Jafer) 2019-12-19 15:53:44 +0500 #5

I will try to get it checked by another mechanic and see what the issue is. I think it could also be TPS calibration issue as the TPS was removed from throttle body during service.

aminjafer5441 (Amin Jafer) 2019-12-24 12:06:48 +0500 #6

I managed to solve the issue myself. Both the IAC and TPS calibration were not in spec. I adjusted both and also reset the ecu. Now the Idle RPM has returned to the original 800 RPM on petrol.

uzairhussain21 (uzair) 2020-12-13 23:31:19 +0500 #7

I'm having an issue with my efi cultus. On cold start it's rpm is between 2000-2200. After 4-5 mins it starts decreasing and then again stays idle at 1500.as soon as i start driving it comes back to normal that is 800.
I've consulted few people about this thing but they say it's normal in winter but i think it isn't.
Anyone here who faced this problem or having a solution to this problem please share.
I recently had its throttle body cleaning and installed thermostat valve as well.
Thanks!

Hassan1991 (Electrical Engineer ) 2020-12-14 01:59:26 +0500 #8

Your IACV need adjustment.

nnabeel (nnabeel) 2020-12-14 17:38:45 +0500 #9

It is normal behviour. Do a good long run on long route.

after that it will come to 1500 at startup and then back 800-900.

uzairhussain21 (uzair) 2020-12-15 23:46:28 +0500 #10

Recently drove about 700km's on this weekend but same behavior.

uzairhussain21 (uzair) 2020-12-15 23:47:08 +0500 #11

How to reset ecu? Will it help in this matter?