exhaust noise

1. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

   #1 3rd July 2010, 19:07

   got a mk2 vtr had new bk box and new car fitted last year.when i first had cat done could hear noise.basically sounds like a ball bearing in a can when i put foot down.is this faulty cat or lamba.have taken bk as under warranty and garage saying i need diagnostic to prove it faulty ca.is there anyway of knowing when lamba has gone or is that a diagnostic as well.Thanks inadvance guys
2. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #2 3rd July 2010, 19:23

   dodgy lamba should cause the engine management light to come on tbh but sometimes it wont, best to whack it on a diagnostics test
   
   the sound could be the baffles disintergrating or disintergrated though
3. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

   #3 3rd July 2010, 19:25

   cant be baffles in bk box as new and noise was there before,middle section new and cat noise wasnt there before new cat fitted.havnt had engine managment light come on either
4. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #4 3rd July 2010, 19:28

   so the exhaust is all new right??
5. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

   #5 3rd July 2010, 19:31

   yeah bk middle and cat,as i said preds noise appeared after cat was put on.
6. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #6 3rd July 2010, 19:36

   between manifold and cat/centre did they use a fire gasket??
   
   id also check the actual sensors to make sure there not loose
   
   make usre the bolts that hold the manifold to centre/cat are tight too, sometimes the springs can cause the sound your on about, also the exhaust is it a standard or aftermarket??
7. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

   #7 3rd July 2010, 19:43

   not sure on the gasket lame question but is the lamba sensor the one on th downpipe and is that the only sensor.gonna get diagnostic next week.just bit worried as mot next month preds.u know how they go..like the lottery lol.
8. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

   #8 3rd July 2010, 19:51

   you should have a oxygen sensor and lamba sensor
   
   lamba should be before the cat and the oxygen after the cat
9. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

   #9 3rd July 2010, 19:53

   something else i didnt know,cant you tell havnt had many saxos.will diagnostic pick up faults on either sensor so if it is sensor will machine state which one.
10. Predator_R32p Super Moderator Joined: Mar 2003 Durham (England) Posts: 37932 1. AX 2. Mk2 Saxo VTR 3. MK4 R32 DBP

    #10 3rd July 2010, 19:56

    it might it might not mate, only way ok knowing is to put it on the machine and hope it comes up with some error code `
11. jaytay Frequent Poster Joined: Feb 2010 birmingham Posts: 858 saxo vtr 2000 black modified

    #11 3rd July 2010, 19:58

    nice one preds,see what machine says next week.nothing to major i hope.