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blowing exhaust

Discussion in 'Motors' started by Malt_Vinegar, 10 May 2006.

  1. Malt_Vinegar

    Don

    Joined: 20 Oct 2002

    Posts: 15,258

    Location: In a house

    I have a quick question, does a blowing exhaust affect MPG?? Noticed mine is blowing from where the first box manifold looks a bit knackered.

    I blocked up the tail pipe on idle and it kept running, could hear the gases escaping from that join.

    Noticed my MPG being rather poor at the same time, kinda hoping its related :p
     
  2. Vipernet

    Mobster

    Joined: 18 Oct 2002

    Posts: 2,789

    Location: 2 doors down from Subo

    yes, muchos
     
  3. Malt_Vinegar

    Don

    Joined: 20 Oct 2002

    Posts: 15,258

    Location: In a house

    Sorted, i shall be under the car this weekend then :p

    Cheers chap :D
     
  4. Dogbreath

    Capodecina

    Joined: 18 Oct 2002

    Posts: 16,653

    Location: Devon

    Leaks at the front of the exhaust can cause poor economy if there is an oxygen(lambda) sensor fitted as the air drawn in will cause a weak mixture to be registered by the ECU which will add more fuel to compensate. If no lambda sensor then small leaks make very little difference, apart from causing lots of popping on the overrun.
     
  5. agw_01

    Capodecina

    Joined: 11 Apr 2004

    Posts: 19,690

    Heh, I've noticed loads of popping from my exhaust.

    It's blowing just where the centre pipe meets the cat... if I get my foot down hard and lift off quickly, I can get it to make a rather loud bang! :D
     
  6. cymatty

    Capodecina

    Joined: 27 Sep 2004

    Posts: 13,305

    Location: South Yorkshire

    Thats not the zorst. ;) :p
     
  7. Malt_Vinegar

    Don

    Joined: 20 Oct 2002

    Posts: 15,258

    Location: In a house

    Its the very first join at the bottom of the manifold, i actually dont know if my car has Lambda...

    I shall google...
     
  8. Lopéz

    Man of Honour

    Joined: 17 Oct 2002

    Posts: 27,696

    Location: LE9/OTK

    Blowing exhausts really aggravate me.

    I've got 2 choices tomorrow - I can either:

    Drop my exhaust, get out the MIG, attempt to lay some bird droppings across the cnetre hanger, and re-fit

    OR

    Drop my exhaust and hurl it into the nearest bin, get out the MIG, and try and knock up something concocted from standard components, OMP components, and Magnex components.
     
  9. Malt_Vinegar

    Don

    Joined: 20 Oct 2002

    Posts: 15,258

    Location: In a house

    Option 2 sounds good to me :D
     
  10. ZG002

    Capodecina

    Joined: 22 Jul 2004

    Posts: 10,524

    Location: Up north in Sunderland

    yeah im having the same problem.. think im gonna have to order the parts and fit them. my MPG is mega low atm..
     
  11. Gaijin

    Don

    Joined: 18 Feb 2003

    Posts: 8,499

    Location: Brighton/West Wicklow

    is there no kind of sealant that can be used to sort blowing out?
     
  12. Malt_Vinegar

    Don

    Joined: 20 Oct 2002

    Posts: 15,258

    Location: In a house

    I have no idea what the actual leak looks like yet. Once i know what its like i will make a judgement as to what is required.

    However at the moment there is some doubt if my car actually has a lambda sensor!!
     
  13. ZG002

    Capodecina

    Joined: 22 Jul 2004

    Posts: 10,524

    Location: Up north in Sunderland

    there is yeah.. exhaust putty and exhaust bandages..

    but they are only temp fixes really.. i had done mine and it was ok for a couple months.. but its proper blowing now.. so new parts time.. yey
     
  14. Lopéz

    Man of Honour

    Joined: 17 Oct 2002

    Posts: 27,696

    Location: LE9/OTK

    Sealing compounds tend to dry out and crack up with vibration, so they don't last very long.
     
  15. Bat

    Hitman

    Joined: 19 Oct 2002

    Posts: 986

    I used plumbing sealant on my bike exhausts. It's clear and never dries completely solid. Working a treat so far.
     
  16. Tesla

    Capodecina

    Joined: 19 Jan 2003

    Posts: 17,410

    Location: Bristol, UK

    How true is it that stainless steel exhausts cost almost the same as a regular one?

    I think my new mondeo has a tiny hole somewhere as if I boot it then around 4k rpm it sounds like it's blowing, but only around 4k rpm for about 500rpm.

    Also, doesnt always do it. Werid!
     
  17. needmorespeed

    Mobster

    Joined: 18 Oct 2002

    Posts: 3,497

    Location: Harlow, Essex

    a stainless steel exhaust will cost £200-300 for a mondeo you could get a normal one for half that maybe less excluding the cat :)
     
  18. Tesla

    Capodecina

    Joined: 19 Jan 2003

    Posts: 17,410

    Location: Bristol, UK

    What about just cat-back?

    I think I need to get my car up on some ramps to check it out, also I can screw on the engine floor tray I kept off of my last mondeo.
     
  19. needmorespeed

    Mobster

    Joined: 18 Oct 2002

    Posts: 3,497

    Location: Harlow, Essex

    that is cat back :)