RPM needle bouncing up and down in idle

saadahmad.shaikh (saadahmad.shaikh) 2017-05-15 16:39:32 +0500 #1

I have Honda city exis 2000 model. Sometimes when the car is at idle / neutral, the RPM bounces up and down i.e abrupt movement from 2000 to 0.

I have recently get the TB serviced and new spark plugs installed with oil change and new air filter. I am not sure about the cause of this problem.

Further, apparently there seems to be no leak in the cooling system but radiator water is reducing by 100 ml every week. not sure what is the reason.

Useful suggestions in this regard are sought

munirbhatti (munirbhatti) 2017-05-15 17:03:19 +0500 #2

Clean engine throttle body, Your problem will be resolved.

saadahmad.shaikh (saadahmad.shaikh) 2017-05-15 17:06:29 +0500 #3

throttle body is serviced one week back.. before that this problem was also present, went away for few days and now again re-surfacing... is it because of bad ground wiring ?

biloo (Bilal) 2017-05-15 19:24:12 +0500 #4

What car is it and from where did u get your Tb serviced? And was this problem present before TB cleaning as well ?

saadahmad.shaikh (saadahmad.shaikh) 2017-05-15 19:45:19 +0500 #5

the car is Honda City 2000 model... this problem was there before TB service as well and now again appearing.. I got TB service from a mechanic based in FB area

biloo (Bilal) 2017-05-16 11:13:53 +0500 #6

Looks like a problem with your idle control valve . Or prolly the TB wasnt installed back properly. Get a 2nd opinion from some other mechanic imo

saadahmad.shaikh (saadahmad.shaikh) 2017-05-16 11:18:51 +0500 #7

could it be due to some bad ground wiring???

munirbhatti (munirbhatti) 2017-08-21 13:38:37 +0500 #8

This is not normal, Please clean the Throttle Body, Problem will be resolved, I checked this several times and success from last 5 years..

defiance599 (defiance599) 2017-08-21 14:37:33 +0500 #9

this happens usually due to a vaccum leak. check to see if the throttle body is seated properly and there is no improperly connected or cracked pipes causing a vaccum leak after the throttle body

mmalam_pk (mmalam_pk) 2017-08-23 15:45:19 +0500 #10

My exis City 2000 have same problem, are you able to resolve it yet?

dhaphasevi (Ahmed Farooq) 2017-08-23 16:45:04 +0500 #11

Actually as the person says its in idle and a.c. Is on may be due to a.c. Compressor working more due to less gas and this can make rpm bounce due to a.c.. As throttle body is cleaned let them check this.