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Thread: is there a solution of idle rpm problem of civic on cng???

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    Angry is there a solution of idle rpm problem of civic on cng???

    please tell me if there is solution of idlr rpm problem in civic vti on cng..have done almost every possible thing but of no use..kit serviced,throttle body serviced plugs changed,tappets adjusted,had complete computer check up from honda 3s and found there is no sensor problem of throttle body,tried to increase rpm manually and tunning done thousand times...
    please help me as this is so irritating


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    making a new thread everyday for the same problem wont fix ur car
    i am sure u did not do everything mentioned in ur previous thread

    https://www.pakwheels.com/forums/cng...le-rpm-problem
    Life is short and very unpredictable just like a Quarter mile .....

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    meri civic mein ye masla tha magar ek sensor chok tha. woh machanic nay sahe kiya tu thek ho gaya masla. phir aisa kuch masla nahin aya. it was civic 96 vti
    I Was Born Brilliant; Education Ruined Me

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    Yaar Get the terminals of the battery as well as connections especially where the wires are grounded, checked.
    Another thing is that get your CNG adjusted yourself. Try to experiment with it while doing with the mixer and CNG adjuster knob.
    open the mixer till the car starts missing a little little bit. You can check it be sitting in the car and feeling that thing. You will have to do it as you wouldn't be noticing it much while outside if you are not practised enough. Then close the mixer till that missing is very very slightly present. You wouldn't have to turn the mixer knob many many times for this. That is a very minimal procedure. Then go for the adjuster knob. Adjust it a little bit till the missing is about completely vanished. From missing, I don't mean that your engine will be going down and up again and again but a little vibe of that cylinder missing the burst inside it.

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    if u ve done all the things mentioned above then canhe ur air filter and must check the air filter housing it should not be broken even an inch. must also ensure that air intake is completely open and its not blocked (as many road side fankaar mistrys block the air intake half or quarter , to increase the pick ov the ride,as they say.********)idle rpm problem on cng happens most ov the time due to air blockage. gari suffocate ho jati hai jab puri hawa nahin milti
    No one cares for Toyota more then Toyota

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    otherwise i have seen this problem of idle rpm fluctuation in every second vti . i think this model is bound to give this problem as its not designed for to be run on gas and moreover it has got very complicated wiring system
    No one cares for Toyota more then Toyota

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    Quote Originally Posted by usmanashraf1 View Post
    please tell me if there is solution of idlr rpm problem in civic vti on cng..have done almost every possible thing but of no use..kit serviced,throttle body serviced plugs changed,tappets adjusted,had complete computer check up from honda 3s and found there is no sensor problem of throttle body,tried to increase rpm manually and tunning done thousand times...
    please help me as this is so irritating
    if u r from rawalpindi visit IBRAHIM at shell petrol pump in scheme-3. I got my civic 97 vtech tuned from him n he is an expert.

  8. 09-09-2010, 11:19 PM

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    @vagabondpiper..ok tomorrow i will put a new air filter and will check the whole air filter housing by myself..hope to have good results..
    @farhan 678..ok bro i will give a try to that mechanic u have mentioned..
    @hash4u..i have done everything possible as i mentioned but still not getting any results..

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    yesterday i went to enercon g10..he tunned up the car and MASHALLAH now my half of the problem is solved..now the rpm remains at 800 without ac..but when i turn ac on the car starts vibrating some times but sometimes it remains at 700-750 which is acceptable as the car dont vibrate..the enercon guy said that it is normal but i dont think so..because my car was very fine before this problem and its rpm was at 800 with or without ac..now what i want to ask is that it is still tunning problem or ac system also has something to do with it..and the rpm on petrol is at 800 with or without ac..

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    the honda is dead simple in wiring, the problem with the hunting rpm is that the CNG waalay adjust rpms from the throttle stop screw, that screw should never be disturbed or you would need to calibrate the throttle position sensor to the throttle body, the idle is supposed to be adjusted from the idle speed screw - which sits on top of the throttle body, usually requires a flexible screwdriver to adjust - which many mechanics dont have thats why they tamper the throttle stop. IDIOTS class A++++

    e.g. Ive seen CNG mechanics remove a throttle body from a Geely (chinese stupid car) - to remove that you need to remove the studs holding it OR the brake master cylinder. They removed the stud and then instead of using threadlock on the studs - mixed water with salt and put that on the stud - saying it will soon corrode and hold it tight, I was like W T F - you are relying on corrosion as threadlock. what IQ or mentality was that
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    yes xulfiqar bhai i also doubt the mentality level of all the mechanics..they always do experiments..
    my problem is very irritating..the rpm drops on a/c for about 100-200 from 800 or sometimes from 700 and the car starts vibrating...today the enercon guy told me to change air filter housing..according to him it has some leaks and thats why rpm drops....i want to ask that ,could this be a solution to my problem???

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    nopes - what you need to do is to clean the idle control motor and lube it with oil too, adjust your idle on petrol with the thing disconnected - to 600 rpms connect back and it should come to 850 rpms by itself. Your TPS should be calibrated to 0.45 or 0.5 volts at resting position. Reset the ECU to clear the code and start the car again, let idle for about a minute on petrol then switch to CNG and adjust idle speed from the idle speed air screw on top of the throttle body.

    The biggest culprit of hunting idle is the missing thermostat valve - this causes the engine to run cold and have a raised idle - which our GENIUS mechanics try to control by fiddling the throttle - and then you face the idle drop on A/C and other problems
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Same problem is with my CIVIC 98 EXI Auto...it was alrite i was coming from isplamabad filled my cylinder from bhera n from there it start this masla RPM control nahe ho raha....N and P pa its 1000 but when i switch it to D4 it starts dropiing upto 800 n with AC it will *** to 750
    $#@N!

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    the ecu will always aim for controlling the rpms at 750 on A/C and drive no matter what you try to do
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  16. 27-09-2010, 09:53 PM

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    Quote Originally Posted by Xulfiqar View Post
    the ecu will always aim for controlling the rpms at 750 on A/C and drive no matter what you try to do
    I 100% agree with Xulfiqar, no matter what you do, the ECU will try to control the idle air flow to get the required idle RPMs..We should never ever adjust the idle screw which will disturb the TPS values. As Xulfiqar has mentioned, there is a saparate adjustment available at the throttle body for controlling the idle manually if for some reason it is required.
    @Xulfiqar
    I am surprised with your knowledge and happy as there are few people here who know about the stuff they are talking about..

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    my problem also started after filling cng...before my car was very fine..no vibration and no dropping of rpm..but it suddenly dropped after the refill and after that day i have spent alot of money and time on it but of no use still...

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    Same problem in my '98 vti...and i even changed the choke wich replaces the idle control sensor but nothn happend..my car idles at 1200-1300
    I'm so JDM my blood Type is R

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    is your throttle body worn out? - check by removing and see if there are excessive gaps on the sides of the throttle blade
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    no i dont think so,because i got my throttle body cleaned twice and once honda people adjusted it..no one told me that their is such problem..
    xulfiqar bahi please tell what are the things which could be involved in rpm dropping(on cng)??when the car is hot then it also drops rpm a bit widout a/c and with a/c it drops rpm everytime..

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    ur car needs to be tuned on cng n idle revs needs to be adjusted,any mechanic can do it,not a big prb
    www.facebook.com/performancepartslahore

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