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Hard to start - Leaky Injector(s)?

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by snicklefritz, Nov 7, 2018.

  1. snicklefritz

    snicklefritz Member

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    The VR reg is a slightly different design but looks like it mounts very similarly (Mine had a philips head screw). I wouldn’t be surprised if it was interchangeable.

    The Haynes manual I have covers VN, VP, VQ, VR & VS, 1988 - 2000 yet only makes one mention of fuel pressure:

    240 - 260 KPa at idle
    280 - 320 KPa with engine off

    Which to me would suggest they are all pretty much the same?

    I wonder if it would be worth grabbing a VR one and seeing if it bolts up etc?
     
  2. woteva

    woteva NEED 4 SPEED

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    Just pulled the VR fuel reg off the rail.
    Numbers on it below with a Bosch symbol.
    3.0bar. 469
    0280 160 529

    Looks just like your VS reg pics.
     

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  3. snicklefritz

    snicklefritz Member

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    Thanks for doing that, much appreciated.

    Looks to me like the only difference is the location of the vacuum line which is nothing really.

    Nowhere local sells these things so i’ll have to order one online.

    Just in case anyone else finds themselves in the same situation i’ll report back in about a week or so with my results.

    Cheers
     
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  4. RWD4ever

    RWD4ever Member

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    Didn't they increase the pressure slightly in the later engines, to get a few more kW on the glossy brochures?
     
  5. Wozza

    Wozza Well-Known Member

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    No Idea :) but shouldnt hurt
     
  6. snicklefritz

    snicklefritz Member

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    Well the new reg finally arrived...

    Bad news though, it doesn’t fit in the end of the fuel rail. The old reg is 10mm and the new one seems to be 12mm.

    Not sure what my options are at the moment.

    Thinking maybe just mounting a universal reg to the firewall and plumbing it inline with the dud one.

    That should work shouldn’t it?
     

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  7. Wozza

    Wozza Well-Known Member

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    Bummer...Id suggest milling out the end of the fuel rail but the fact they are different sizes prob means there are other differences as well...
    A 2nd hand Vt/VX fuel rail might be a cheaper option and give you a little more time before they become obsolete....but no idea if its even doable...
     
  8. snicklefritz

    snicklefritz Member

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    I put the old reg back on so at least it is driveable until I figure out what I want to do with this ute.

    I was planning to have the engine out in a couple of weeks to do the rear main seal, sump gasket, clutch + flywheel but I’m seriously considering just putting this whole thing on the back burner for a while whilst I consider my options in regards to either a super6 or v8 conversion.

    It’d probably be cheaper to buy a newer ute, but I prefer the look of the VS and it’s otherwise in pretty good condition.

    I guess this issue can be considered resolved for now.

    Thanks everyone
     
  9. snicklefritz

    snicklefritz Member

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    Just in case anyone was interested...

    I did manage to source another fuel reg and it didn’t solve the problem. I also replaced the coil packs and the engine ran better but it didn’t help with the starting issue. I was going to replace the dfi module however the one I ordered from Sparesbox caused the engine to have a nasty misfire so I put the original back in.

    I ended up replacing the fuel injectors since I already had them and gave the throttle body and plenum a good clean.

    It now starts first time, 90% of the time, and seems to run better than it has in a long time.
     
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  10. VS_Pete

    VS_Pete Donating Member

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    Thanks for letting us know.:)
    Cheers Pete
     
  11. jeepster

    jeepster Member

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    I had similar problem with mine. When stopped for more than an hour, it was hard to start unless you primed it 3 or 4 times. The pressure regulator had been replaced 3 years ago by dealer workshop. I suspected the fuel pump check valve and put a non-return valve in where the fuel filter goes. That made quite a difference, however if standing 24 hours, it is still hard to start, so I suppose I have a leaky injector.
    I compare it with my mum's low-mileage VS [only used once a week] and that starts instantly after 7 days!
     

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