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  1. #1
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    Project 240 t5 has developed a miss fire

    The 240 t5 developed a miss fire this morning, I managed to get the car back home. So this afternoon I've changed over the plugs and coil packs but still it miss fires with a afr of 18 @ idle so she's running lean.

    Could it be a injector or two not supplying enough fuel ? Or I'm barking up the wrong tree 😊

    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,

  2. #2
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    I have some experience of T5 engines having running problems related to the slightest misplacement of earthing leads in their natural environments.

    If you have a transplant into an older RWD car then that might be an area to check.

    Don.
    MTE performance software, Ferrita stainless exhausts, TME stainless exhausts, AP heavy duty clutch kits, KU single mass flywheels and LSDs. 01494 785508. email don@kalmar-union.com

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  3. #3
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    Here is a video of the afr's on start up.


    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,

  4. #4
    Ghost Rider
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    And this is the fuel pressure at idle.


    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,

  5. #5
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    Would I be right in thinking, that the pressure should be 3bar min in your video? and is the mixture ok at other speeds/loads or is this just an issue at idle. Just thinking about the vac/pressure pipe to the fuel pressure valve being ok

    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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  6. #6
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    The fuel pressure should be 3 bar minus vacuum so at 2.5 bar the fuel pressure is about right.

    The more worrying thing was the afr's rising then dropping like a stone, at 3k rpm the afr's climbed to 16

    Anyway it's all sorted now and going like a rocket.

    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,

  7. #7
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    What was the cause then?


    T35, 556Nm/410lbft & 361BHP/317WHP


 

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