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Thread: Chevy-chevrolet joy car drops rpm on 2nd gear

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    Question Chevy-chevrolet joy car drops rpm on 2nd gear

    Ever since I got a tunning from 2-3 places in Rawalpindi....my CNG setting is out....car runs perfect with very good mileage on petrol.

    But when in CNG mode especially with A/C on the RPM in 2nd gear drops...i have to give lil acceleration and then release clutuch for it to take pick in 2nd gear.....

    I tried few mechanics.....some say throttle body....some say CNG setting....some say CNG kit needs a over hauling......

    My joy is 2008 model in very good condition....I need you guys to comment who is the right mechanic to approach as company is charging too much and they even replace old items with cars new ones.....I dont wana take any chances.....more over only chevy outlet is only in I-9 islamabad ....others have perished with time

    Help me !!!!!!!!!!!!!!!!!!!!


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    One more problem is ....my car used to run on A/c CNG at 150 km/hr but not its not going to even 130 km/h without a/c even.....I dont know wht the problem is ....as I have ran the car on CNG upto 150 km/h and 170 km/h on petrol on Motorway with A/c Still on!!!!!

    Guide me a mechanic who can help dignose the real problem in its pick and top speed....forgot to mention i changed its tyres 6 months back and installed 13 number dunlop 165....pehlay 12 number thay....does it affects top speeds???

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    changes tyres does change topspeed aswell as your mileage. There is a tyre size calculator. google it and you can find it. it will tell you the difference. However my chevy exclusive has 14's 165 and as far as i know the drive is smoother but it eats up more petrol.
    Baat karo haq ki, chahay hatt jaye sabki

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    14 kaisay ?? i had to use a spacer on back springs to ensure the tyre doesnt touches the mudguards.....warna wo tou lag rahi thee car when at full load....

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    um. i have been driving it for quite some time and its trouble free. doesnt touch at all.
    tire size is 165/70 r14
    Baat karo haq ki, chahay hatt jaye sabki

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    Help me !!!!!!!!!!!!!!!!!!!!

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    Ever since I got a tunning from 2-3 places in Rawalpindi....my CNG setting is out....car runs perfect with very good mileage on petrol.

    But when in CNG mode especially with A/C on the RPM in 2nd gear drops...i have to give lil acceleration and then release clutuch for it to take pick in 2nd gear.....

    I tried few mechanics.....some say throttle body....some say CNG setting....some say CNG kit needs a over hauling......

    My joy is 2008 model in very good condition....I need you guys to comment who is the right mechanic to approach as company is charging too much and they even replace old items with cars new ones.....I dont wana take any chances.....more over only chevy outlet is only in I-9 islamabad ....others have perished with time

    Help me !!!!!!!!!!!!!!!!!!!!
    <!-- / message -->

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    Quote Originally Posted by bottlechain View Post
    Ever since I got a tunning from 2-3 places in Rawalpindi....my CNG setting is out....car runs perfect with very good mileage on petrol.

    But when in CNG mode especially with A/C on the RPM in 2nd gear drops...i have to give lil acceleration and then release clutuch for it to take pick in 2nd gear.....

    I tried few mechanics.....some say throttle body....some say CNG setting....some say CNG kit needs a over hauling......

    My joy is 2008 model in very good condition....I need you guys to comment who is the right mechanic to approach as company is charging too much and they even replace old items with cars new ones.....I dont wana take any chances.....more over only chevy outlet is only in I-9 islamabad ....others have perished with time

    Help me !!!!!!!!!!!!!!!!!!!!
    <!-- / message -->
    hello bhai, did you find any solution for this?

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    hello,
    there could be different root cause, i need to know what was changed when problem starts. you have to check the following things.
    1. Check if the STAP100B (spark timing advance processor) is working properly.
    if it is not, it could be power loos on CNG and as a result engine has to work hard to get the desire speed, high RPM could cause the high consumption.

    2. Air Fuel mixture is not good:
    you will find the Lambda sensor at exhaust pipe, this sensor will give you the information if the fuel mixer is OK or lean or rich.

    3. Air reducer : if you are using mixer system and find the lean mixture at 2nd gear, absence of air reducer could case and can be solved by putting an air reducer.

    thank you,
    Murtaza

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    did yur problem solved same with me to

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    You need to perform IDLE LEAN PROCEDURE, to do it yourself see idle lean procedure jb683 - Bing=

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