Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: Z18XE MOT Failure.

  
  1. #1
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Z18XE MOT Failure.

    Hi,

    Looking for maybe some advice or something, i know or have read somewhere the Z18XE ECU's are common to failure?

    Basically, the cars failed due to Emissions, here are some resaults

    Last Year:
    Fast Idle Test,
    CO: < 0.20% Vol (Limits) - 0.00% Vol (Actual Value)
    Natural Idle Test,
    CO: < 0.30% Vol (Limits) - 0.00% Vol (Actual Value)

    This Year:
    Fast Idle Test,
    CO: < 0.30% Vol (Limits) - 4.79% Vol (Actual Value)
    Natural Idle Test,
    CO: < 0.50% Vol (Limits) - 9.09% Vol (Actual Value)

    So, from last years resaults to this year something major has happened. The ECU has been reporting the O2 Sensor1 Bank1 as faulty, it was replaced, it still persisted to say this was faulty, so i put another on... It still said it was faulty so i gave in and left Management light on for the past 6 months. AFM has also been replaced.

    Today, i got those figures from the MOT. We tried putting a 1.5v Battery on +/- of the Lambda sensors connector (So basically disconnecting the lambda and putting a battery on +/-) figures were still the same.

    We plugged in the scanner, the lambdas were reading 4.12v thats both PRE and POST. Reved the car a couple of times, the lambda readings went to 4.30v ... again PRE and POST.

    Could it be possible my ECU is shot causing this issue being that it repeatedly reports a faulty sensor.

  2. #2
    Status
    Offline
    ntsri's Avatar
    AOC Newbie
    Join Date
    Jan 2007
    Posts
    23
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    have you chacked for any airleaks or that the coolant temp sensor is working properly? most of the time lambda probs can be caused by air leaks or other things

  3. #3
    Status
    Offline
    jimmywrc's Avatar
    AOC Regular
    Join Date
    Feb 2008
    Posts
    210
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by nyzrox View Post
    Hi,

    Looking for maybe some advice or something, i know or have read somewhere the Z18XE ECU's are common to failure?

    Basically, the cars failed due to Emissions, here are some resaults

    Last Year:
    Fast Idle Test,
    CO: < 0.20% Vol (Limits) - 0.00% Vol (Actual Value)
    Natural Idle Test,
    CO: < 0.30% Vol (Limits) - 0.00% Vol (Actual Value)

    This Year:
    Fast Idle Test,
    CO: < 0.30% Vol (Limits) - 4.79% Vol (Actual Value)
    Natural Idle Test,
    CO: < 0.50% Vol (Limits) - 9.09% Vol (Actual Value)

    So, from last years resaults to this year something major has happened. The ECU has been reporting the O2 Sensor1 Bank1 as faulty, it was replaced, it still persisted to say this was faulty, so i put another on... It still said it was faulty so i gave in and left Management light on for the past 6 months. AFM has also been replaced.

    Today, i got those figures from the MOT. We tried putting a 1.5v Battery on +/- of the Lambda sensors connector (So basically disconnecting the lambda and putting a battery on +/-) figures were still the same.

    We plugged in the scanner, the lambdas were reading 4.12v thats both PRE and POST. Reved the car a couple of times, the lambda readings went to 4.30v ... again PRE and POST.

    Could it be possible my ECU is shot causing this issue being that it repeatedly reports a faulty sensor.
    if u got 02 sensors and it say bank 1, how long as it been like that?? could have done the cat in ?

  4. #4
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    No airleaks, temps are all fine.

    It has reported bank1 for around 11 months now, its been replaced twice.
    Ive had a different manifold on for 6 months and same. (Still standard manifold)

    Changed AFM, basically the only thing that hasnt been changed is the lambda in the downpipe which id presume is sensor2

  5. #5
    Status
    Offline
    Pete 2's Avatar
    AOC Obsessed
    Join Date
    Dec 2003
    Posts
    1,138
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by nyzrox View Post
    so i gave in and left Management light on for the past 6 months
    NEVER, EVER leave the management light on for long periods.

    This neglect can literally KILL your car.

    A build up of faults can happen, & u will think it is only your O2 sensors giving the error.

    You could now be facing a BIG bill, depending on the damage that has been caused.

    Get Vauxhall to plug it in to a Tech 2 or something.
    This will tell you exactly what 's wrong.

  6. #6
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by Pete 2 View Post
    NEVER, EVER leave the management light on for long periods.

    This neglect can literally KILL your car.

    A build up of faults can happen, & u will think it is only your O2 sensors giving the error.

    You could now be facing a BIG bill, depending on the damage that has been caused.

    Get Vauxhall to plug it in to a Tech 2 or something.
    This will tell you exactly what 's wrong.
    Scanned it today, P0130 - Lambda bank1 sensor1 as always
    cleared it off, back on in 15 mins

    Weve used Dataloggers, Scanners on the car.

    Hence me getting the voltage information etc.

  7. #7
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Problem = ECU. Earth is ****ed on it by the looks, its been looked at for 5 hours.

  8. #8
    Status
    Offline
    Toms1989's Avatar
    Soft Top VTEC :)
    Join Date
    Dec 2007
    Posts
    11,356
    Mentioned in
    0 Post(s)
    Quoted
    1 Post(s)
    Just replace the earth then

    Have you not tried just disconnecting the battery for an hour?

    resets the ECU completely
    FULL Black Leather Heated coupe interior for sale! £200!!!
    Click Here

  9. #9
    Status
    Offline
    nyzrox's Avatar
    AOC Obsessed
    Join Date
    Apr 2007
    Posts
    1,675
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Quote Originally Posted by Toms1989 View Post
    Just replace the earth then

    Have you not tried just disconnecting the battery for an hour?

    resets the ECU completely
    Looms are fine, tried disconnecting the battery i did this 11 months ago, ive had odb2 scanners on the car. Used a datalogger on it, a auto electritian been on it for 5 hours.

    Ground looped, ECU is knackered.

  10. #10
    Status
    Offline
    Toms1989's Avatar
    Soft Top VTEC :)
    Join Date
    Dec 2007
    Posts
    11,356
    Mentioned in
    0 Post(s)
    Quoted
    1 Post(s)
    Dam

    Hard luck mate, hope it all gets sorted
    FULL Black Leather Heated coupe interior for sale! £200!!!
    Click Here

Page 1 of 2 12 LastLast

Similar Threads

  1. Suspected ecu failure on z18xe.....
    By calvert in forum NA Engines (Non-turbo petrol) inc. Transmissions
    Replies: 10
    Last Post: 08-12-2013, 23:15
  2. Head gasket failure, thermostat failure, new timing belt :(
    By malfunkshun in forum NA Engines (Non-turbo petrol) inc. Transmissions
    Replies: 14
    Last Post: 08-10-2012, 23:29

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •