Exhaust making the engine jerk!?

1. Mick1989 L-plater Joined: Oct 2006 Kent Posts: 73 Ford Focus 1.6 16v Ebony Black

   #1 9th March 2007, 18:53

   Hey people my local garage told me my exhaust (3" Peco) is probably causing the problem on my 1.1. it jerks when putting the accelerator down in all gears, sometimes badly and sometimes not at all.
   
   Then sometimes the engine light comes up and goes later, and the diagnostics has been done twice and there is no problem, and the plugss and coil pack been replaced. What else could it be? do i need to go back to a standard exhaust, or will the vtr exhaust fit onto the 1.1? I got a feeling the engine cant handle the exhaust pressure. is this making sense?
   
   Any help appreciated. Thanks
2. riggsy Saxperience Post Whore Joined: Jan 2006 West Sussex Posts: 6280 Mk2 Saxo Vts

   #2 9th March 2007, 18:55

   Has it got a decat?
3. Mysticp Scotland Joined: Jul 2005 Edinburgh Posts: 9556 Saxo 1.6i 16v VTS, 2 Classic Minis

   #3 9th March 2007, 18:57

   If your traveling at a constant speed and u back off the accelerator ever so slightly to let the engine begin slowing the car, does it jerk then?
   
   And if you were to ease back onto the throttle again would it jerk then?
   
   Might be your differential, also i wouldnt rule out the rear engine mount, depnding on the kind of knock it is!
4. Mick1989 L-plater Joined: Oct 2006 Kent Posts: 73 Ford Focus 1.6 16v Ebony Black

   #4 9th March 2007, 19:04

   no decat riggsy. And it never jerks when going at a constant speed, it is more so when are slow down to turn and start accelerating outta the turn and it jerks: when i go back on the throttle.
   
   You don't think it is the exhaust; as i had no problem when i had the standard one on. And thats what the mechanic saying
5. riggsy Saxperience Post Whore Joined: Jan 2006 West Sussex Posts: 6280 Mk2 Saxo Vts

   #5 9th March 2007, 19:07

   Nah dont think its the exhaust then.
   
   One of the things Mystic said i think.
   
   Mine jerks when you let off the gas when its cold, but thats because it has full system manifold decat bla bla.
6. Mick1989 L-plater Joined: Oct 2006 Kent Posts: 73 Ford Focus 1.6 16v Ebony Black

   #6 9th March 2007, 19:09

   yeh i think the mechanic is talking shit
7. Holmes23 Regular Poster Joined: Sep 2006 Chesterfield Posts: 310 Saxo 1.1 X

   #7 9th March 2007, 19:09

   i have got (4") exhuast on my 1.1, does not cause any problems for me
8. riggsy Saxperience Post Whore Joined: Jan 2006 West Sussex Posts: 6280 Mk2 Saxo Vts

   #8 9th March 2007, 19:11

   Even when you let off the gas when cold? ^^
9. Mick1989 L-plater Joined: Oct 2006 Kent Posts: 73 Ford Focus 1.6 16v Ebony Black

   #9 9th March 2007, 19:13

   what is the rear engine mount mystic?
10. Mick1989 L-plater Joined: Oct 2006 Kent Posts: 73 Ford Focus 1.6 16v Ebony Black

    #10 9th March 2007, 23:12

    anyone any other ideas?
11. saxo8 L-plater Joined: Feb 2007 Posts: 40

    #11 11th March 2007, 17:57

    Quote:

    Originally Posted by Mick1989 anyone any other ideas?

    rear engine mount for definate mate my vts did the same so i changed both bushes on the bottom engine mount connected to the underside of the car problem solved!