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Thread: Civic 2001 exi - rpm drop on ac

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    Default Civic 2001 exi - rpm drop on ac

    Salam fellow pakwheelers.

    This post is on behalf of a friend who has recently bought a 2001 civic exi (7th gen) in karachi.

    Few details for reference:
    - original engine with manual gear
    - Cng is installed but not used
    - odo reading is only 79k kms
    - car has been tuned on petrol
    - new plugs, air filter, oil filter, oil changed 400km back.
    - no check engine light
    - car has been scanned and shows no error codes

    Issues at hand:
    1. Car runs smoothly without a/c. As soon as the aircon is switched on the rpm drops from 900 to 600.

    2. When the aircon is on and we engage first gear to get the car moving, no matter how much we squeeze the throttle, the rpm doesn't go above 1200 and the car simply doesnt get off the line. It seems to run fine in all other gears, just not in 1st from a stationary postion.

    Would really appreciate your help to resolve these issues as it has become quite a headache for my friend.

    Thank you in advance.

    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Had a similar problem with my civic 99 vti with auto trans. After hours of failed diagnosis(trial & error) we finally found that when we replaced the AC compressor the problem went away. The main diff between our problems are that i got fed up when nothing worked & just went to get my AC serviced because it needed one and the guy suggested that try changing the compressor. It was pure luck in my case and i would advise get the AC parts checked if not already done. Hope your problem is solved.

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    Quote Originally Posted by rafay710 View Post
    Had a similar problem with my civic 99 vti with auto trans. After hours of failed diagnosis(trial & error) we finally found that when we replaced the AC compressor the problem went away. The main diff between our problems are that i got fed up when nothing worked & just went to get my AC serviced because it needed one and the guy suggested that try changing the compressor. It was pure luck in my case and i would advise get the AC parts checked if not already done. Hope your problem is solved.
    Thanks buddy.

    The compressor presently running in the car does not make any noise. Never checked whether it has been replaced or is original. Will get that checked.

    Could you clarify if there was any issue with your car's a/c compressor (noise, non-genuine, etc) or was this also part of the experimentation?
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    I think you need throttle body servicing actually there is a valve in throttle body which opens when you turn on AC to increase the rpm to take load of AC and if its chocked than it causes this problem.

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    Quote Originally Posted by jehanzebnasir View Post
    I think you need throttle body servicing actually there is a valve in throttle body which opens when you turn on AC to increase the rpm to take load of AC and if its chocked than it causes this problem.
    Throttle body has been serviced. Even tried a replacement throttle body.

    All in vain
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    I also tried throttle body servicing but to no avail. My car's compressor was the original one and had started to make "click click" noises when idling after (and yes AFTER) the servicing so instead of having it checked i just asked him to get a kabli one as i really did not want my headache to turn into a stroke. The compressor change worked for me that is why suggested you to get it checked too.

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    Thanks @rafay710

    Will give this a shot *fingers crossed*
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    If you have an OBD reader... the cheap ones available on PW or quite handy for troubleshooting small issues...If you don't have a reader, just take it to any mechanic who has one... Now check your engine load readings on with and without AC.

    On my civic, the load without AC is around 25-30% and with AC the load increases to around 40-45% (on idle)... This way you can rule out the possibility of compressor taking excess load.

    If the load is under tolerable levels, i would advise you to check wirings...IACV valve and other AC related wiring.

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    I am assuming your car is a 7th Gen civic. if its 6th gen then just ignore my advise as the 6th gen doesn't have an obd port.

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    If your ecu does not recieve the signal of ac switching on, it will not adjust for idle. It could be one of the reasons.

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    Quote Originally Posted by fahadwizz View Post
    If you have an OBD reader... the cheap ones available on PW or quite handy for troubleshooting small issues...If you don't have a reader, just take it to any mechanic who has one... Now check your engine load readings on with and without AC.

    On my civic, the load without AC is around 25-30% and with AC the load increases to around 40-45% (on idle)... This way you can rule out the possibility of compressor taking excess load.

    If the load is under tolerable levels, i would advise you to check wirings...IACV valve and other AC related wiring.

    I am assuming your car is a 7th Gen civic. if its 6th gen then just ignore my advise as the 6th gen doesn't have an obd port.
    It is a seventh gen bro.

    The car has been scanned a couple of times. Will confirm from the owner whether he had the a/c load scanned.

    But the results of the scan (using Launch Pro) showed no error codes - also no flashing check engine light.
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Quote Originally Posted by metalhead View Post
    If your ecu does not recieve the signal of ac switching on, it will not adjust for idle. It could be one of the reasons.
    I can understand the idle not adjusting to the a/c switching on.

    But what about the car not being able to build up revs from a stationary position when the a/c is on
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Quote Originally Posted by Sha2eb View Post
    I can understand the idle not adjusting to the a/c switching on.

    But what about the car not being able to build up revs from a stationary position when the a/c is on
    This means that there is something wrong with the fuel mixture, injectors, ignition advance with load, filter clogging, air leak in manifold, sticky IAC valve, faulty MAP, faulty TPS... Any of the above can be disturbing the revving up. Rule out all one by one.

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    Such problem occurs in my 7th gen when cng tuning is out.

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    Quote Originally Posted by metalhead View Post
    This means that there is something wrong with the fuel mixture, injectors, ignition advance with load, filter clogging, air leak in manifold, sticky IAC valve, faulty MAP, faulty TPS... Any of the above can be disturbing the revving up. Rule out all one by one.
    All the above have been checked (serviced the serviceable parts and the others were replaced to check if they were faulty) problem still persists.

    Also if any of the above were off, the car would have an issue without the aircon on as well, but it runs fine. The issue only comes up when the aircon is switched on
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Quote Originally Posted by metalhead View Post
    Such problem occurs in my 7th gen when cng tuning is out.
    Currently the car is running on petrol. Need to resolve this issue prior to having cng tuned
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Quote Originally Posted by Sha2eb View Post
    It is a seventh gen bro.

    The car has been scanned a couple of times. Will confirm from the owner whether he had the a/c load scanned.

    But the results of the scan (using Launch Pro) showed no error codes - also no flashing check engine light.
    High engine load on IDLE due to faulty compressor will never flash lights or throw codes. Its a conclusion you draw by looking at the numbers.

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    Quote Originally Posted by fahadwizz View Post
    High engine load on IDLE due to faulty compressor will never flash lights or throw codes. Its a conclusion you draw by looking at the numbers.
    Thanks for the clarification bro. Will have this confirmed
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    An update from today.

    Got the ac compressor checked. No issues and was advised not to have it changed.

    Had the engine load on ac checked out as well. Nothing of major concern there either.

    But was advised to have the car checked out by a mechanic who sits in the lane of kit zone cng on jail road. Apparently the timing belt was not properly aligned. So a couple of hours of work and voila... Car runs perfectly fine now.

    Tuned on petrol and cng with no issues.

    A shout out to everyone for the help. Really appreciate it.

    Mods may please close the thread!
    2015 Suzuki Swift DLX | 2015 Honda City 1.3

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    Quote Originally Posted by Sha2eb View Post
    An update from today.

    Got the ac compressor checked. No issues and was advised not to have it changed.

    Had the engine load on ac checked out as well. Nothing of major concern there either.

    But was advised to have the car checked out by a mechanic who sits in the lane of kit zone cng on jail road. Apparently the timing belt was not properly aligned. So a couple of hours of work and voila... Car runs perfectly fine now.

    Tuned on petrol and cng with no issues.

    A shout out to everyone for the help. Really appreciate it.

    Mods may please close the thread!
    Good to hear about your problem getting solved.

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