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Thread: Fires then dies

  1. #41
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    Quote Originally Posted by oblark View Post
    The hacked M4.4 software from VS will only allow the fault codes to accessed when the engine is running, its something to do with the baud rate.



    Will try this today



    The battery is only a few months old.



    Will try this today aswell.

    I've been thinking about why it won't start,

    When it fires it revs to 1500 rpm then dies, if the throttle is depressed when the engine fires it make no difference.

    To me it's got fuel and a spark as it firing,
    But it won't run - to make it run the ecu needs to know the following,

    Amount of air being drawn in.
    Position of throttle butterfly.
    Position of the crank & cam shafts.

    As its firing you would think all of the above are working, I've changed the MAF for a working one. So today I'm going to start by trying Claymores & PNut ideas if they don't work I'm then going to changing over sensors to hopefully find the fault.
    A couple of other things I would check, or you may have checked already.... do you still have fuel pressure after it has stalled? or could it be the fuel pump is priming & then cutting out when the engine fires & dies?

    are the injectors continuing to pulse as it dies?

    do you have a spark still as it dies?

    what do the plugs look like?

    obviously some of that isn't easy to ascertain if you are working alone!

    I suspect if it had crank/cam sensor issues it would not know when to fire in the first place!

    I guess it may be worth checking the wiring to those sensors as they probably share the same plastic sheilding of the alternator wiring..... maybe you are knocking one of those sensors out when it starts?
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  2. #42
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    And todays update.

    Removed alarm relay and linked out 50E & 50F - no change
    Removed alternator drive belt - no change

    So the first sensor and the easyist to be changed was the cam sensor - no change
    As the crank sensor is pain to get at I decided to have a look at the throttle switch.

    Interesting ..........

    On start up & idle the ecu needs to see 0.5V at CT (closed throttle) and I had 0.0V
    At WOT the ecu needs to see 4.8V I had 0.0V
    So it looked like the throttle switch is fubar'd I fitted one from a standard throttle body.
    And guess what...... the £$%&er started

    So the fault was a throttle switch which had gone open circuit.

    Refitted the orginal cam sensor, MAF sensor and it started again.
    Went for a drive and all was OK

    James the alternator looks to be fine, it's kicking out a good 13.8 - 14.0 volts.

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

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  4. #43
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    Quote Originally Posted by oblark View Post
    And todays update.

    Removed alarm relay and linked out 50E & 50F - no change
    Removed alternator drive belt - no change

    So the first sensor and the easyist to be changed was the cam sensor - no change
    As the crank sensor is pain to get at I decided to have a look at the throttle switch.

    Interesting ..........

    On start up & idle the ecu needs to see 0.5V at CT (closed throttle) and I had 0.0V
    At WOT the ecu needs to see 4.8V I had 0.0V
    So it looked like the throttle switch is fubar'd I fitted one from a standard throttle body.
    And guess what...... the £$%&er started

    So the fault was a throttle switch which had gone open circuit.

    Refitted the orginal cam sensor, MAF sensor and it started again.
    Went for a drive and all was OK

    James the alternator looks to be fine, it's kicking out a good 13.8 - 14.0 volts.
    glad you got it sorted Rob, not something that I would normally suspect, but one to bear in mind as these vehicles age further and are more likely to start chucking up these faults more often

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  5. #44
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    Quote Originally Posted by MoleT-5R View Post
    glad you got it sorted Rob, not something that I would normally suspect, but one to bear in mind as these vehicles age further and are more likely to start chucking up these faults more often
    If it didn't start it was going to get a Basil.


    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

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    glad its fixed!

    Wonder what caused it? or just a bizarre coincidence?
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    She may not be perfect but i love her anyway....

  8. #46
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    Nice one

    Bit odd that it was fine before the alternator change. As PNuT says, wonder why it suddenly went fubar? Autopsy?
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
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  10. #48
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    Quote Originally Posted by Dangerous Dave View Post
    Nice one

    Bit odd that it was fine before the alternator change. As PNuT says, wonder why it suddenly went fubar? Autopsy?
    I had a fuel pump and a MAF fail just like that, one minute working then not.

    When the fuel pump failed a few years ago I parked it up went to start after being left for 5 mins nothing.

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

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  12. #49
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    Quote Originally Posted by oblark View Post
    I had a fuel pump and a MAF fail just like that, one minute working then not.

    When the fuel pump failed a few years ago I parked it up went to start after being left for 5 mins nothing.
    Bloody cars LOL. Oh well fingers crossed it will be a lot less trouble for you now
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

  13. #50
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    Quote Originally Posted by oblark View Post
    I had a fuel pump and a MAF fail just like that, one minute working then not.

    When the fuel pump failed a few years ago I parked it up went to start after being left for 5 mins nothing.
    feel your pain, had this happen on the way to work a five in the morning, tried everything but had to abandon the car and returned 14 hrs later to find I could not get her to go and she was transported home for the second time in 8 years, not bad really that she failed to get me home twice in 8 years

    Quote Originally Posted by oblark View Post
    If it didn't start it was going to get a Basil.


    lol....you'd make a great Basil

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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    Good to hear it's running again.
    Don't you just love random, complete failures?!

    Oh Dave, I love the new avatar gif!

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    Quote Originally Posted by Doingitsideways View Post
    Oh Dave, I love the new avatar gif!
    Cheers bud, was one I made ages ago. Was going to do another more elaborate one but never got round to it. I will eventually The sounds of each action went really well with it too.
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

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  18. #53
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    Quote Originally Posted by Dangerous Dave View Post
    Cheers bud, was one I made ages ago. Was going to do another more elaborate one but never got round to it. I will eventually The sounds of each action went really well with it too.
    I think sound effects made by the mouth like the police academy bloke, but bad, would be ace!

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    Quote Originally Posted by MoleT-5R View Post
    glad you got it sorted Rob, not something that I would normally suspect, but one to bear in mind as these vehicles age further and are more likely to start chucking up these faults more often
    I was interested in the symptoms being very similar to the immobiliser for future issues so unplugged the throttle position sensor on my car & it started ran & brought on the EML so suspect it is more an issue with this particular set up....

    In general I have found very few of the sensors on these will stop the car from running
    http://www.vpcuk.org/forums/image.php?type=sigpic&userid=2552&dateline=1218822  313
    She may not be perfect but i love her anyway....


 

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