engine flat spot!!

1. matt_wolves Regular Poster Joined: Apr 2010 Braunton Posts: 330 BLACK SAXO VT?

   #1 31st March 2011, 09:22

   when im driving normal or hard when i go between 2000-3000 rpm it hits like a flat spot and doesnt like going quick through the revs then sudenly when you hit 3000-3500 its like the cams kick in and it flys. Its a vts.
   
   why is it doing this?
   
   ive changed loads of sensors because i had a bad idle. icv, lamdba, both temp sensors, map sensor,tps,spark plugs (NGK iridium), coilpack
   
   cheers matt
2. Gareth_R Established Member Joined: Mar 2010 Basildon, Essex Posts: 1042 Citroen AX VTS

   #2 31st March 2011, 10:16

   That is normal
3. matt_wolves Regular Poster Joined: Apr 2010 Braunton Posts: 330 BLACK SAXO VT?

   #3 31st March 2011, 12:07

   really well my vtr wasnt like that so i cant see how its normal.
4. VTRGT L-plater Joined: Nov 2010 Posts: 54 VTS

   #4 31st March 2011, 16:20

   I've just bought a VTS and it feels the same as that too. I still have my VTR and it feels a lot torquier than the VTS.
   
   I'm going to change the fuel filter on the VTS to see if it improves the performance as I don't think it's ever been changed. You could give that a go, if not you could try a rolling road to see wht it's putting out.
5. Gareth_R Established Member Joined: Mar 2010 Basildon, Essex Posts: 1042 Citroen AX VTS

   #5 31st March 2011, 19:46

   It's not a vtr though is it - the 16v behaves a bit differently to the 8v
   
   I've got a vts engine in my ax - feels flat low in the revs and then picks up as it goes above 3500 revs. Know a few others with the 16v engine and everyone says the same. Makes for good mpg when you're not ragging it though
6. matt_wolves Regular Poster Joined: Apr 2010 Braunton Posts: 330 BLACK SAXO VT?

   #6 31st March 2011, 22:11

   oh ok but when im lower than 1500 rpm it misfires and doesnt want to move??
7. Gareth_R Established Member Joined: Mar 2010 Basildon, Essex Posts: 1042 Citroen AX VTS

   #7 1st April 2011, 07:01

   That is probably an unrelated issue, the sensors you changed did you buy new ones?
8. matt_wolves Regular Poster Joined: Apr 2010 Braunton Posts: 330 BLACK SAXO VT?

   #8 1st April 2011, 09:00

   yh all of them were new
9. BertieG Established Member Joined: Oct 2009 exeter, devon Posts: 1224 Clio 172

   #9 1st April 2011, 09:17

   Quote:

   Originally Posted by matt_wolves oh ok but when im lower than 1500 rpm it misfires and doesnt want to move??

   thats because the engine has no power under 1500. i can just about cruise at about 20 at 1500 rpm, but it certainly wont accelerate
10. matt_wolves Regular Poster Joined: Apr 2010 Braunton Posts: 330 BLACK SAXO VT?

    #10 1st April 2011, 09:35

    oh ok haha its just so different to my vtr
11. VTRGT L-plater Joined: Nov 2010 Posts: 54 VTS

    #11 1st April 2011, 12:15

    My VTR feels very punchy through the rev range but has nothing left at 6000rpm. The VTS feels pulls way past that though I've no doubt the VTS would be quicker but the VTR just feels quicker