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Thread: Civic 99 Drinking Petrol like Sharbat

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    Thumbs up (FINALLY SOLVED) Civic 99 Drinking Petrol like Sharbat

    Salam PWs
    My civic is drinking petrol like hell. does only 300 kms per tank on highway & even less in city. The petrol needle can be felt going down while driving. there is no leakage & car moves great on petrol. no problem in driving.
    On CNG it does 200kms per 55cylinder. can u tell me how to increase petrol average. i have the advancer installed and it works. no problem on driving on CNG or PETROL. plz help

    ***EDIT***
    Problem Solved
    For all lazy people like me See Last Page


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    Quote Originally Posted by mohzsin View Post
    Thanks bro for replying...IACV everything was cleaned by Honda mechanics,every sensor was checked.

    But good news is i just opened its airfilter box and felt loose sensor next to TB i guess connected to IACV. I just started the car n simply changed its position i mean rotated a little to center position n walllaaah RPM came to normal n why this sensor was loose bcz there was only one screw which was also not tighten...there was no second screw . Well got it fixed by placing both screws and tightened them. Well finally no idle rpm or high rpm issues.

    Thanks guys!
    Post a pic of that sensor. Are you sure its the iacv and not something else? Did they take off all sensors from the TB while cleaning?
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    @irfan44: what is your car's average now?
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by xsxd View Post
    @irfan44
    i seem to be having the same issue... rough idling...tried out 8 different IACVs and another throttle body but to no avail... tariq semi-sorted (pronounced 'jugarr') it by blocking one hole in the iacv... but... its just not proper... idle is now at 1000 to 1200 rpm
    usually is the TB gasket, IM gasket, or IACV when the top is plugged

    When the engine has a high, hunting idle, pull off the intake and look into the throttle body opening where air flows. You will see two holes or ports on the inside wall of the throttle body. The upper port leads to the MAP sensor whereas the lower port leads to the IACV. Cover the IACV port with your finger. If the idle speed drops and fluctuation stops, then try to adjust the idle screw on the throttle body. If this doesn't work, then the IACV, ECT sensor, or TPS may be bad. If covering the IACV port does not affect the idle speed, there is a vacuum or intake air leak.

    All vacuum hoses connect to nozzles on the intake manifold. Disconnect each hose one at a time and then cover the corresponding nozzle with your finger. If the idle speed drops to normal for any disconnected vacuum hose, there is a leak in that hose system.

    If there are no vacuum leaks, then the throttle body or intake manifold gaskets/bolt torque should be considered next.

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    Quote Originally Posted by xsxd View Post
    does that mean honda peeps are incompetent?

    dnt knw about there incompetency but for sure alot of nuts and screws are missing. Well bad experience with them.

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    Quote Originally Posted by irfan44 View Post
    usually is the TB gasket, IM gasket, or IACV when the top is plugged

    When the engine has a high, hunting idle, pull off the intake and look into the throttle body opening where air flows. You will see two holes or ports on the inside wall of the throttle body. The upper port leads to the MAP sensor whereas the lower port leads to the IACV. Cover the IACV port with your finger. If the idle speed drops and fluctuation stops, then try to adjust the idle screw on the throttle body. If this doesn't work, then the IACV, ECT sensor, or TPS may be bad. If covering the IACV port does not affect the idle speed, there is a vacuum or intake air leak.

    All vacuum hoses connect to nozzles on the intake manifold. Disconnect each hose one at a time and then cover the corresponding nozzle with your finger. If the idle speed drops to normal for any disconnected vacuum hose, there is a leak in that hose system.

    If there are no vacuum leaks, then the throttle body or intake manifold gaskets/bolt torque should be considered next.
    awesome.. i am saving this post of yours... thanks mate.

    Well the finger in the iacv intake does drop the idle speed and there is no recorded fluctuation. So it doesnt seem to be a vacuum leak issue. I've been told its the IACV - that matching an IACV with the engine is a problem. will follow your guide and post back.
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by mohzsin View Post
    dnt knw about there incompetency but for sure alot of nuts and screws are missing. Well bad experience with them.
    i just hate it when mechanics do that!!
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by xsxd View Post
    awesome.. i am saving this post of yours... thanks mate.

    Well the finger in the iacv intake does drop the idle speed and there is no recorded fluctuation. So it doesnt seem to be a vacuum leak issue. I've been told its the IACV - that matching an IACV with the engine is a problem. will follow your guide and post back.
    Trying out different IACVs is not a solution. Follow what 'mohzsin' did.

    Clean out the TB (dont mess with throttle stop screw and the Throttle position sensor), clean out the intake manifold, inspect all vacuum hoses, and while putting everything back together make sure all screws are present and tightened adequately.
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Quote Originally Posted by ahsanonline View Post
    Trying out different IACVs is not a solution. Follow what 'mohzsin' did.

    Clean out the TB (dont mess with throttle stop screw and the Throttle position sensor), clean out the intake manifold, inspect all vacuum hoses, and while putting everything back together make sure all screws are present and tightened adequately.
    had the TB and Intake Manifold cleaned, throttle screw and TPS adjusted every time we put in a new IACV (a total of 9 hours of work). Need to check the vacuum hoses though.
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    The easy way to check a vacuum leak is spraying on every part with a Carb Cleaner Spray. if u feel the engine flutter when sprayed on a specific part then narrow it down caz thats the culprit.

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    Double post

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    Quote Originally Posted by xsxd View Post
    had the TB and Intake Manifold cleaned, throttle screw and TPS adjusted every time we put in a new IACV (a total of 9 hours of work). Need to check the vacuum hoses though.
    You messed with the throttle stop screw. Get rid of the TB, its useless now.

    Get ur TB replaced with a kaabli unit that hasn't been messed with. DO NOT mess with the throttle stop screw, DO NOT mess with the TPS. Its only the IACV and the two holes of Map sensor and iacv that need cleaning.
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Quote Originally Posted by ahsanonline View Post
    You messed with the throttle stop screw. Get rid of the TB, its useless now.

    Get ur TB replaced with a kaabli unit that hasn't been messed with. DO NOT mess with the throttle stop screw, DO NOT mess with the TPS. Its only the IACV and the two holes of Map sensor and iacv that need cleaning.
    i didnt... the mech did... and i even tried a kabli TB, that didnt work too. when the IACV is working fine, thats when i will get a new TB.
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by irfan44 View Post
    ^ u never mentioned abt cleaning of iacv. wat u just got is the cleaned TB & sensors checked. do the following & keep fingers xrossed:
    1. normally when TB is cleaned by spraying cleaner the TB gets cleaned but the IACV becomes dry. so it gets stuck. So get ur IACV out & get it cleaned & then lubricated with 2-3 drops of brake oil.
    2. Check for vacuum leaks. try tightening the bolts which hold on the TB to the intake mani. when TB is taken out for cleaning its gaskit or gene we say needs to b replaced which we normaly dont bother abt & use the old gaskit. but the gaskit is to be changed whenever it is opened.
    So check for vacuum leaks very comprehensively. small misalignment of air cleaner box or small cracks r common.
    Do not ever do that to the ISCV valve, it needs a few drops of engine oil or ATF, not brake fluid.
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    Quote Originally Posted by xsxd View Post
    i didnt... the mech did... and i even tried a kabli TB, that didnt work too. when the IACV is working fine, thats when i will get a new TB.
    Throttle stop screw is factory-set with precision tools. Now the mech has messed with it, and with the tps as well - that is where the problem lies. IACV is not your problem, its working fine.
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Quote Originally Posted by xsxd View Post
    @irfan44: what is your car's average now?
    9km in city & 13km on highway

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    Quote Originally Posted by Xulfiqar View Post
    Do not ever do that to the ISCV valve, it needs a few drops of engine oil or ATF, not brake fluid.
    Oops did i say brake fluid
    i take my words back. its ATF or Engine oil. Xulfiqar is right.
    @Xulfiqar
    thnx for correction

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    Quote Originally Posted by Xulfiqar View Post
    Do not ever do that to the ISCV valve, it needs a few drops of engine oil or ATF, not brake fluid.
    dont worry... i didnt.
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    the TPS can be adjusted... but i dunno why everyone here is adamant on setting it to 0.66 instead of the standard 0.45-0.5
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by xsxd View Post
    the TPS can be adjusted... but i dunno why everyone here is adamant on setting it to 0.66 instead of the standard 0.45-0.5
    Which is why the idea not to mess with it!!

    All idle problems of iacv can be sorted out by cleaning out iacv only.
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    ah... well... so should i reset it back to 0.45 - 0.5?

    Which is preferable? 0.45 or 0.5?
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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