saxo wont rev all the way.... video inside

1. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

   #1 16th October 2010, 18:46

   my vtr wont rev all the way round and its doing my head in, ive changed the engine, map sensor, crank sensor (2nd hand) so might be shit still!
   
   anyone experienced this before....... CLICK HERE FOR ANNOYING PROBLEM
2. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

   #2 16th October 2010, 19:00

   That sounds like it is on the rev limiter. Is is really not revving out or not just revving out on the tacho, meaning what is it like when in gear and driving???
3. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

   #3 16th October 2010, 19:02

   Is that the management light flashing on as well???
4. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

   #4 16th October 2010, 19:04

   nah its not revving all the way it stopps at about 5 and the tacho has a spasm and yes the management light flashes on!
5. LScottBell Frequent Poster Joined: Oct 2009 Posts: 822 Citroen Saxo Vtr 2001

   #5 16th October 2010, 19:13

   Best getting someone to read the engine management code mate and that should pin point the cause ?
6. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

   #6 16th October 2010, 19:15

   will the code be there if it only shows up when driving or will it be stored?
7. bald24 Established Member Joined: Sep 2009 St.Neots Posts: 1443 1.1i '51

   #7 16th October 2010, 19:15

   Unplug battery, let ECU reset?
8. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #8 16th October 2010, 19:16

   How many revs you do at 70mph in 5th - I think your rev counter is under reading myself.
   
   Should be around 3200rpm at 70mph 5th gear
9. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

   #9 16th October 2010, 19:19

   It maybe worth getting the fault memory scanned. The ECU is seeing a problem when it is revving as well so it is likely that it will come up with the problem (stored fault). A bizarre fault!!
   
   I have seem faults like this with the following....
   
   1. Plugs breaking down under cylinder pressure.
   2. Low fuel pressure.
   3. Electrical noise/interference in engine speed (crank) sensor.
   4. ECU faults (not that common as a cause).
   
   Not a massive help I know sorry...
10. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #10 16th October 2010, 19:27

    Quote:

    Originally Posted by bald24 Unplug battery, let ECU reset?

    did that when i changed the engine!
    
    

    Quote:

    Originally Posted by Stevo123 How many revs you do at 70mph in 5th - I think your rev counter is under reading myself. Should be around 3200rpm at 70mph 5th gear

    its got a vts box, so about 3500 - 3700RPM
    
    

    Quote:

    Originally Posted by burgerfeet It maybe worth getting the fault memory scanned. The ECU is seeing a problem when it is revving as well so it is likely that it will come up with the problem (stored fault). A bizarre fault!! I have seem faults like this with the following.... 1. Plugs breaking down under cylinder pressure. 2. Low fuel pressure. 3. Electrical noise/interference in engine speed (crank) sensor. 4. ECU faults (not that common as a cause). Not a massive help I know sorry...

    so, new plugs, and how would i check fuel pressure?
11. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

    #11 16th October 2010, 19:43

    Measuring fuel pressure requires the correct kit with adaptors. I am sure I have seen a normal schrieder valve on the multipoint saxo's.
    
    To me it sounds like it is on the limiter but the tacho is not echoing what is being heard.....is the top road speed right down as well???
12. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #12 16th October 2010, 19:49

    it just sounds really weird when it happens when u drive, but it will rev to right near the redline then just jolts real violently in the car where its kicking back!
13. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

    #13 16th October 2010, 20:49

    Quote:

    Originally Posted by Mint-VTR it just sounds really weird when it happens when u drive, but it will rev to right near the redline then just jolts real violently in the car where its kicking back!

    So apart from this issue the car us pulling well under load right up to the red line??? This would rule out plugs, crank senor, fuel pressure etc I think. I would now just get the fault code memory read.
14. user_26566 Established Member Joined: Aug 2008 harlow/ essex Posts: 1414 stealth Vtr/S

    #14 17th October 2010, 19:01

    crank sensor?
15. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #15 18th October 2010, 09:29

    Quote:

    Originally Posted by toms_vtr crank sensor?

    changed it yesterday still nothing
    
    gonna get it on the diagnistics!
16. furio09 Regular Poster Joined: Apr 2009 london Posts: 449 oyster card for now!

    #16 18th October 2010, 09:54

    earthing? maybe i think this happened to a friend with a retop
17. baker556 Saxperience Forum Bum Joined: Mar 2007 127.0.0.1 Posts: 4826 oem+ sax

    #17 18th October 2010, 10:48

    what sort of speeds do you get out of 1st 2nd 3rd on the limiter this would tell you if the rev gauge was not telling you the correct revs...
18. Aaron Saxperience Post Whore Joined: Jan 2008 ..... Posts: 5231 ..............

    #18 18th October 2010, 11:27

    Lambda or ecu?
    
    single plug ecu or three plug?
19. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #19 19th October 2010, 15:27

    Its a single plug, and you thinking lambda? Ill investigate!
20. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

    #20 19th October 2010, 16:00

    Lambda will not make it limit
21. stroutsy Frequent Poster Joined: Apr 2010 Deal, kent Posts: 625 saxo vee tea are

    #21 19th October 2010, 16:04

    launch control
22. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #22 19th October 2010, 17:34

    Could it be possible that I've melted the loom because there was one incident where the coil pack supressor, black cube coming off the coil pack loom, bypassed ( ie the cube rotted off) and I earthed it with a connector, and when I tried to start it, it smoked and I think I fucked something!
23. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #23 25th October 2010, 18:48

    bump up
24. wesley-saxo Frequent Poster Joined: Aug 2010 portsmouth Posts: 796 corsa sxi saxo

    #24 25th October 2010, 19:22

    get it on diagnistic
25. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

    #25 25th October 2010, 20:04

    Quote:

    Originally Posted by Mint-VTR Could it be possible that I've melted the loom because there was one incident where the coil pack supressor, black cube coming off the coil pack loom, bypassed ( ie the cube rotted off) and I earthed it with a connector, and when I tried to start it, it smoked and I think I fucked something!

    That black thing is a capacitor, know as a suppressor. It's job is to remove electrical noise generated by the coil pack. It passes any electrical 'spikes' straight to the chassis as opposed to it entering the wiring system. If you shorted it you were lucky not to melt part of the loom as it the suppressor is NOT fused. You may have been lucky as this thing is connected to the relay module directly which powers other bits and pieces.
    
    However, with this missing, the higher up the revs you go the more electrical noise will be appearing on all the cars electrical systems. This will cause serious electrical interference!!!!! Contrary to what most people think, this part is not just to stop the clicking you hear on your radio. In modern cars it is critical.
    
    Your first job is to replace it, but you must make sure that you are still getting a 12V supply to it considering you may have fused the wire. You need to be 100% that the wire and supply down it is good or you will be wasting your time.
    
    A diagnostic test will not show this fault up if the missing suppressor is the fault. An oscilloscope would though however.
26. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #26 26th October 2010, 18:33

    wow, thats an answer and a half, u know your shit! so replace the supressor? and test the wires getting a 12v feed!?
27. burgerfeet Infrequent Poster Joined: Oct 2010 Bridgend Posts: 231 VTS 2002 - well the Mrs does

    #27 26th October 2010, 19:48

    Replace the suppressor and test the wire.
    
    I have had a thought since. If at all possible I would try an get inside the relay module if possible. I have no idea if they are sealed with potting compound, never looked at one. It would be useful to look inside just to make sure any circuit board tracks haven't blackened etc.
    
    Try the first two suggestions first.
28. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #28 6th November 2010, 15:46

    been on diagnostics today........
    
29. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #29 10th November 2010, 18:08

    crank sensor changed again, problem solved
    
    cheers guys