Survey by Qualaroo
+ Reply to Thread
Results 1 to 7 of 7

Thread: Santro CNG Backfire problem, Plz Help

  1. #1
    Senior PakWheeler Follow
    jeepaholic's Avatar
    Join Date
    Oct 2006
    Location
    Other
    Age
    49
    Posts
    1,843
    Follows
    1
    Following
    0
    Mentioned
    8 Post(s)
    Tagged
    2 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default Santro CNG Backfire problem, Plz Help

    Hi all, a friend has sent her CNG santro to me from Attock with backfire problem. The car has been checked from many stations at Attock but no good. I am in Islamabad so please suggest the place in Rawalpind/Islamabad where I can get rid of this problem. Thanks in advance
    To all the extreme drivers, please come offroad like ME to keep others safe on the roads.

  2. #2
    Senior PakWheeler Follow
    spectra's Avatar
    Join Date
    Jul 2005
    Location
    Islamabad
    Age
    40
    Posts
    19,667
    Follows
    3
    Following
    0
    Mentioned
    304 Post(s)
    Tagged
    24 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    can i have a look at the car.
    Keep a cool head and wear seatbelts!

  3. #3
    Senior PakWheeler Follow
    LOGAS's Avatar
    Join Date
    Dec 2006
    Location
    Lahore
    Age
    57
    Posts
    1,921
    Follows
    0
    Following
    0
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    @jeepaholic..................

    May I know the details, kit make, emulator/advancer make etc? if any additional gadget installed, its detail?

    Spectra...................

    Hope you will get it through.........email me some time, to be intouch, Thanx
    Economy With Security And Durability.

  4. #4
    PakWheeler Follow
    hamza_00's Avatar
    Join Date
    Nov 2005
    Location
    Lahore
    Age
    29
    Posts
    487
    Follows
    0
    Following
    1
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Hey ppl im havin exactly da same problem but somehow ive managed 2 get it undercontrol but still....... sometimes when im not drivin wid concentration and in higher gare my speed is less, and i put the accelerator down there is a blast in the bonut "BOOM" and its intensity depends on da amount of accelerator i push, and believe me its sometimes quite intense........
    so plz let the findings of this menace be made public so dat others can also figure it out......
    *Regards*

  5. #5
    Senior PakWheeler Follow
    LOGAS's Avatar
    Join Date
    Dec 2006
    Location
    Lahore
    Age
    57
    Posts
    1,921
    Follows
    0
    Following
    0
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    We call this problem a TB (Throttle Body) or Tuberclosis. When it happens, the Throttle Body becomes a combustion chamber as pre-dominated by a spark or valve problem.

    As known to us, there is two areas that you need to be checking for:

    Electrical Sparks

    The most common is the spark plug. Over here, we recommend that Bosch Super 4 or NGK BP6ES to be used. These spark plug can tolerate high temperature or commonly known as 'Cold Plugs'.

    Using the right spark plug is important as mentioned by several experts in this forum. The reason is simple.

    [red]
    A poor spark plug (or likely Hot Plug) may be still very hot (glowing hot) and can cause a Pre-detonation to next incoming Air/CNG mixture. Since the Intake Valve is still open on 'Chamber 2', the Hot Plug detonate the gas unnecessarily in this chamber.

    Case 1 - HOT Plug
    The fire will travel out from the No 2 Chamber Intake Valve and lighting a fire fuse to all the way up to the Throttle Body, and exploding pre-mixed Air/CNG in the TB. Your vehicle should jerk or choke immediately after that. In worst case, your EFI car will have the Throttle Body Butterfly valve blown out or a burnt airfliter


    Spark Plug Cable Cross-Fire
    Alternatively, using non-original spark plug cable can cause a cross-fire. As the electric coil/distributor gives power (voltage) to Cable 1, the current jumps over to Cable 2 as well. Both spark plug 1 & 2 open fires, and you will experience a situation similar to Hot Plug. But only this time around, the cross-firing is lighting up cable 2 and fire fuse to the TB again.


    [b] Intake Valve

    Some vehicle has an adjustment Valve Tappet. These vehicle needs to be regularly adjusted if NOT the intake valve will not close tightly. Again, the firing of that chamber will light a fire-fuse (via Air/CNG) from the Intake Valve gap and into the TB. Hydraulic Valve is likely not to have this problem.


    Once we experience a special case, the owner of a EFI vehicle complaint about backfire. He has been using his car for 12 months and not such problem before. It just started recently, after he has a radiator flushout. The problem turned out to be - he also replace a non-original electric coil on his EFI-based distributor. We have changed all components and nothing work. Finally we found the problem to be changing the low-amps/voltage electric coil.
    Economy With Security And Durability.

  6. #6
    Senior PakWheeler Follow
    jeepaholic's Avatar
    Join Date
    Oct 2006
    Location
    Other
    Age
    49
    Posts
    1,843
    Follows
    1
    Following
    0
    Mentioned
    8 Post(s)
    Tagged
    2 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Thanks so much all of you answered.
    SPECTRA!! can i have a look at the car. sure how can I contact you in the morning?

    LOGAS!! Thanks for such a detailed reply, please you also tell me your number.
    Take care
    To all the extreme drivers, please come offroad like ME to keep others safe on the roads.

  7. #7
    Senior PakWheeler Follow
    LOGAS's Avatar
    Join Date
    Dec 2006
    Location
    Lahore
    Age
    57
    Posts
    1,921
    Follows
    0
    Following
    0
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Jeepaholic................

    Email me gastec1@gmail.com
    Economy With Security And Durability.

+ Reply to Thread

User Tag List

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •