car only revs to 6500

1. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #1 8th June 2010, 22:33

   just put on a unlocked ecu and now the car only revs to 6500 doesnt feel like a hard limit more like a fuel cut
   
   
   
   btw its a vts
2. lyndon Saxperience Forum Bum Joined: Mar 2007 Bristol / Wakefield Posts: 2656 Ph2 172, MK1 VTR

   #2 8th June 2010, 22:38

   Do the ECU's all have hard cut limiters on? It could be softcut?
3. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #3 8th June 2010, 22:40

   but still why would it be at 6500
4. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #4 8th June 2010, 23:21

   dont think it the hard limint
5. Ax_beefy Frequent Poster Joined: Jun 2006 Cannock Posts: 973 Citroen AX VTS

   #5 8th June 2010, 23:27

   Should go up to 7250 atleast mate if its a J4 ecu
6. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #6 8th June 2010, 23:32

   would a vtr ecu run a vts
7. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #7 10th June 2010, 11:45

   any one have an idia
8. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

   #8 10th June 2010, 15:57

   guess not
9. JRC1 Saxperience Forum Bum Joined: Mar 2008 Southampton Posts: 4839 16v'd White Furio & MK5 Golf R32

   #9 10th June 2010, 16:04

   You can't use a VTR ecu with a VTS engine dude.
10. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #10 10th June 2010, 16:05

    so that ruels that out just need to know why its doing it now
11. Ax_beefy Frequent Poster Joined: Jun 2006 Cannock Posts: 973 Citroen AX VTS

    #11 10th June 2010, 16:08

    In theory if the pins on the plug are the same eg. temp sensor etc. then theres no reason a vtr ecu will not run the engine but it will be a bag of shit
12. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #12 10th June 2010, 16:12

    well it runns fine apart from it limiting at 6500
13. user_42881 Frequent Poster Joined: Mar 2010 North Shields Posts: 779

    #13 10th June 2010, 16:36

    could be the rev guage??
14. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #14 10th June 2010, 17:06

    works fine with the old one and i can tell its not where it used to
15. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #15 10th June 2010, 17:16

    A vtr ecu will run it - what model number is the ecu?
16. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #16 10th June 2010, 17:34

    i will have a look didnt think it would tbo
17. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #17 10th June 2010, 17:37

    Someone on here is running a 1.4 ecu on his 16v - doesn't run great but it runs.
    
    Otherwise could be a crank position sensor fault?
18. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #18 10th June 2010, 17:43

    might tri that
19. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #19 10th June 2010, 17:52

    0291206860 and it was from ecu testing
20. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #20 10th June 2010, 17:54

    Does it have 1ap.41 on it? 1ap.81?
    
    I'm not 100% about 3plug codes but could look it up - that the only code on the Ecu?
    
    If this simply happened when you fitted the Ecu then it hints at your problem. Why'd you need to buy an unlocked ecu?
    
    I've never heard of that ecu place
21. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #21 10th June 2010, 17:56

    with the old ecu on it wouldnt idle at all and kept staling but now with this one it idles fine some times cuts out and limits at 6500
22. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #22 10th June 2010, 17:59

    So you were originally running a saxo 'vts' ecu with a more modern complete jp4 engine?
    
    Did you get the last ecu diagnosed as faulty? Did ecu diagnostic place supply you with an ecu for a saxo j4 or for a jp4 engine?
    
    The crank position sensor look okay? It plugs in okay? Is it a 2 pin connector on it?
23. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #23 10th June 2010, 18:03

    i didnt think the jp4 ecu would run onthe saxo and yes the ecu diagnosed as faulty. plug looks fine and yeah the 2 pin conector on it
24. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #24 10th June 2010, 18:11

    You have to be careful as the map on the saxo ecu (j4) will have a slightly different map on it than the optimum map for a jp4 engine.
    
    did the jp4 engine ever run right on the old ecu?
    
    And ecu diagnostics have given you a j4 ecu?
    
    What happens when you hit 6500? Do the revs drop a lot when you hit it? As if the engine loses sense of when to inject fuel/spark?
25. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #25 10th June 2010, 18:17

    yeah the rvs sometimes drop off and the car has cut out when its happend be for and it ran fine at first with the old ecu.
26. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #26 10th June 2010, 18:18

    Who diagnosed the ecu fault? How they diagnose it?
    
    Ring ecu diagnostic and ask the rev limit they put on it
27. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #27 10th June 2010, 18:19

    mainc motors
28. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #28 10th June 2010, 18:21

    How far the revs drop off? To like 6k or like 3/4k?
29. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #29 10th June 2010, 18:21

    about 5.5 / 6 ish but some times looses all power and cuts out
30. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #30 10th June 2010, 18:27

    Quote:

    Originally Posted by john-paul about 5.5 / 6 ish but some times looses all power and cuts out

    Any lights lit up on the dash?
    
    If it's started when you fitted the ecu then I'd speak to ecu diagnostics and first off ask them what they set the rev limit as - then tell them your problems, don't tell them your problems before seeing what they set it at/or if they touched it at all.
    
    It does sound like the limiter is kicking in at 6500 though
31. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #31 10th June 2010, 18:31

    i didnt think the limit could be changed but will ring them tomoro
    thanks for the help
32. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #32 10th June 2010, 18:35

    The limiter can be changed on them with the right tools.
    
    I'd be fairly confident it's an Ecu problem from what you say about it. I'm surprised your old ecu just shat itself at some point and hence was faulty, without there being any causes/other problems
33. s555dan Regular Poster Joined: Feb 2010 Bristol Posts: 493 16v'd Saxo VTR Mk1 Astra G Coupe 1.8

    #33 10th June 2010, 20:58

    Some good diagnostic there thumbs up
34. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #34 10th June 2010, 23:00

    you taking the piss there
35. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #35 10th June 2010, 23:11

    Quote:

    Originally Posted by s555dan Some good diagnostic there thumbs up

    Quote:

    Originally Posted by john-paul you taking the piss there

    I think (and hope) he was talking about me trying to understand the problem and circumstances - otherwise it's a useless post that doesn't really add any value
36. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #36 10th June 2010, 23:20

    i thought he ment the garages sorry about that its late lol
37. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #37 10th June 2010, 23:25

    No worries
    
    Report back what they say about your rev limit/problems
38. john-paul Frequent Poster Joined: Jan 2010 hetton/sunderland Posts: 662 250 BHP jp4 vts

    #38 10th June 2010, 23:30

    will do thanks agen one of my m8s said try the fuel pump its what his jp4 was doing so going to try that 2
39. Ax_beefy Frequent Poster Joined: Jun 2006 Cannock Posts: 973 Citroen AX VTS

    #39 11th June 2010, 00:01

    Mines on a JP4 block running off a j4 ecu and even with horrible compression figures it revs to 7200 without any hassle