having power issues at around 2000rpm

1. megabob Regular Poster Joined: Mar 2008 Camborne Posts: 287 Saxo VTR

   #1 28th May 2008, 08:53

   I’ve had a new engine fitted to my mk1 saxo VTR which is a grey top from a mk2 VTR, it seems a good engine and had only done 37k. when i did the engine swap i used the old gearbox and had a new clutch, timing belt, manifold and exhaust system.
   the manifold and exhaust is all supersprint.
   
   ok now onto the problem, when im driving my saxo at about 2000rpm in any gear and put my foot down all the power is gone, its like im driving a 1 litre engine and then when i reach about 2300rpm it kicks into action and off i go.
   also sometimes when i stop at a junction the rpm will go wild between 1000-400rpm almost on the verge of stalling.
   and another thing is when i let my foot off the accelerator i get a popping sound but the engine doesn’t slow the car down, but in some cases the engine will not make the popping sound and then you can feel the car slow down under deceleration.
   
   i thought that the manifold may need tightening as it might be letting in some air and screwing up the exhaust gas outlet.
   or the ECU needs calibration, I’m not sure.
   
   Sorry for the long post but i thought it best to get all the info up
2. littleracer Trouble Maker Joined: Feb 2008 hook,hamshire Posts: 3426 black citroen saxo mk2 & focus ST '225',merc C180

   #2 28th May 2008, 10:10

   Quote:

   Originally Posted by megabob I’ve had a new engine fitted to my mk1 saxo VTR which is a grey top from a mk2 VTR, it seems a good engine and had only done 37k. when i did the engine swap i used the old gearbox and had a new clutch, timing belt, manifold and exhaust system. the manifold and exhaust is all supersprint. ok now onto the problem, when im driving my saxo at about 2000rpm in any gear and put my foot down all the power is gone, its like im driving a 1 litre engine and then when i reach about 2300rpm it kicks into action and off i go. also sometimes when i stop at a junction the rpm will go wild between 1000-400rpm almost on the verge of stalling. and another thing is when i let my foot off the accelerator i get a popping sound but the engine doesn’t slow the car down, but in some cases the engine will not make the popping sound and then you can feel the car slow down under deceleration. i thought that the manifold may need tightening as it might be letting in some air and screwing up the exhaust gas outlet. or the ECU needs calibration, I’m not sure. Sorry for the long post but i thought it best to get all the info up

   
   ok first off the idle problem is the idle control vavle,clean or re-new it.
   the popping sounds like normal if you de-catted,its just hydrocarbons being burnt in the zorst.
   as for slowness,you got to remember its a vtr,my advice is do a good service on it,oil,filter plugs etc and see how that goes.
3. megabob Regular Poster Joined: Mar 2008 Camborne Posts: 287 Saxo VTR

   #3 28th May 2008, 10:57

   Quote:

   Originally Posted by littleracer ok first off the idle problem is the idle control vavle,clean or re-new it. the popping sounds like normal if you de-catted,its just hydrocarbons being burnt in the zorst. as for slowness,you got to remember its a vtr,my advice is do a good service on it,oil,filter plugs etc and see how that goes.

   i'll have a look at the control valve.
   it’s had new gear and engine oil and its not slow because its a VTR there’s a noticeable slowness and then a sudden jump in power, which isn’t progressive, its very sudden
4. littleracer Trouble Maker Joined: Feb 2008 hook,hamshire Posts: 3426 black citroen saxo mk2 & focus ST '225',merc C180

   #4 28th May 2008, 11:04

   Quote:

   Originally Posted by megabob i'll have a look at the control valve. it’s had new gear and engine oil and its not slow because its a VTR there’s a noticeable slowness and then a sudden jump in power, which isn’t progressive, its very sudden

   eeerrr,you must have a 2 stroke with a power band,or tuboed lol,
   
   nah defo have a look at the valve and have you changed the plugs?air filter etc.what about fuel filter?
   
   have a look at these things bud.
5. megabob Regular Poster Joined: Mar 2008 Camborne Posts: 287 Saxo VTR

   #5 28th May 2008, 11:19

   Quote:

   Originally Posted by littleracer eeerrr,you must have a 2 stroke with a power band,or tuboed lol, nah defo have a look at the valve and have you changed the plugs?air filter etc.what about fuel filter? have a look at these things bud.

   most of the parts from my old engine were moved over but fuel filter was changed but not the plugs, but they have been cleaned.
   i may have to plug it into a diagnostic to see if that comes up with any answers.
6. Rogz Frequent Poster Joined: Jun 2007 Sunderland Posts: 726 Banned.

   #6 28th May 2008, 12:22

   could be a sticky injector mate? im not sure... try some redex, then get it diagnosed
7. megabob Regular Poster Joined: Mar 2008 Camborne Posts: 287 Saxo VTR

   #7 28th May 2008, 14:19

   Quote:

   Originally Posted by Rogz could be a sticky injector mate? im not sure... try some redex, then get it diagnosed

   yegh i asked my dad as he uset to be a mechanic and he said it might be a sticky injector, ive put redex in through the petrol but not the air inlet, will do that later in the evening
8. pug205gti87 Frequent Poster Joined: May 2007 Birmingham, West Midlands Posts: 704 Saxo Vts

   #8 28th May 2008, 19:29

   water temperature sensor, my vts is doin this, try one, it only costs around 13pound
   let me no the result
9. megabob Regular Poster Joined: Mar 2008 Camborne Posts: 287 Saxo VTR

   #9 29th May 2008, 13:35

   Quote:

   Originally Posted by pug205gti87 water temperature sensor, my vts is doin this, try one, it only costs around 13pound let me no the result

   ok cheers, i'll get hold of one