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Thread: Scvs. . . . Who knows the ins and outs??

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    Default Scvs. . . . Who knows the ins and outs??

    Right it's beginning to wind me up. . . . . Who actually knows how they work???
    I say this as I have had the P0093 code come up a few times, which is app the code for knackered scvs if u have not had the software update.

    But my problem is weird, the car will only run on light throttle, literally 1,500 revs anymore and the car shakes and holds back with pulsating bursts.
    Now I always thought the scvs go under load?? I also have a knackered EGR ( which is ordered) which is confusing the situation as it goes in and out of limp mode at will :-(

    Thanks
    Nick

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    Regular Member m8internet's Avatar
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    Take your car to a mechanic with experience of the Isuzu Y30DT
    They should be able to diagnose the issue within 30 minutes

    When one of the SCV failed on my car there was no fault code and this is what confused the dealership
    They confirmed the engine was going into safe mode, but nothing was being returned, and it took a second visit with the Area Technician to confirm almost instantly what the issue was

    The SCV is part of the fuel pump, of which there are two to feed each of the three injectors
    When one is blocked the fuel is not supplied correctly to the three injectors, hence the erratic running you experience
    When it is completely blocked no fuel will pass and this usually puts the engine into safe mode (and if it has the upgraded EMS software will return the error code for incorrect fuel pressure)

    If you are having an issue on idle then it is NOT a blocked SCV (unless both are completely blocked)

    Once you have repaired or replaced the EGR then compare

    Given all the trouble you are having over the last year you would probably be better buying something like the AA Repair Warranty
    Wait 6 weeks then commence a claim

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    Thanks mate, I am changing the egr on Thursday as that is confusing the problems.
    Am I right in saying scvs will normally have a problem underload? The other weird thing is, when the car is running awful, if I turn ignition off and on it goes!!!! Surely if the scvs are blocked that would not clear them?

    Nick

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by s2yob View Post
    Am I right in saying scvs will normally have a problem underload?
    That is correct, unless both SCV are blocked then it will become very obvious (and this is the stage mine was at towards the end)

    Quote Originally Posted by s2yob View Post
    if I turn ignition off and on it goes!!!!
    That suggests an issue with the exhaust which is then reigniting the fuel
    I've had that before, and again dealership scratched their head
    Took the car to National Tyres for them to inspect the centre section, they confirmed the baffles had failed
    A new centre section solved that issue

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    Regular Member Innes's Avatar
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    I don't know anything about the 3 litre diesels but it sounds like a vacuum problem I've seen on the DTI and 1.9cdti when they have a vacuum leak. Does this engine use vacuum pipes to operate swirl flaps, turbo actuator etc?

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    you need to see live data and have a look at what actually happening when its having the problems mate

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by Innes View Post
    Does this engine use vacuum pipes to operate swirl flaps, turbo actuator etc?
    Yes the Y30DT uses various vacuum pipes
    Thankfully most are easy to access and inspect
    However, most are shrouded in heat proofing and it is almost unheard of failure or any requirement to replace them
    The only one that does seem to get reported is the one near the battery, but that is due to it being very exposed, but again it is very easy to examine as well as replacing

    The swirl flaps are designed to lock open, if the vacuum pressure falls
    I understand there is also a sensor so that this easier to diagnose, but as yet noone on the forum seems to have reported this
    The symptom with this will be large amounts of black smoke at idling, this does not match what has been reported

    The turbo actuator is a known issue
    Sadly the entire component has to be replaced
    Symptoms for this are the turbo not responding with the engine at or above 2000rpm, so that doesn't match what has been reported either
    Last edited by m8internet; 8th November 2011 at 20:26.

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    When my SCV's were knackered they threw up all sorts of codes from turbo pressure, EGR faults, fuel pressure...It's because the car never runs in limp mode / restricted power mode. The ECU thinks everything is fine, but under load or certain revs (I had the same problem as you do now) the lack of fuel pressure triggers all other problems. New SCV's fitted and no more fault codes.

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    Regular Member omega63's Avatar
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    Quote Originally Posted by s2yob View Post
    Thanks mate, I am changing the egr on Thursday as that is confusing the problems.
    Am I right in saying scvs will normally have a problem underload? The other weird thing is, when the car is running awful, if I turn ignition off and on it goes!!!! Surely if the scvs are blocked that would not clear them?

    Nick
    If you are replacing the EGR valve, WHY!!!! not carry on and replace the SCV,s. You need to remove the EGR valve complete to get to the High pressure injector pump, the SCV,s are on the back of this pump. When i did mine i posted pictures on this website showing the entire middle of the engine dismantled to access the pump and SCV,s....

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    Quote Originally Posted by Celes View Post
    When my SCV's were knackered they threw up all sorts of codes from turbo pressure, EGR faults, fuel pressure...It's because the car never runs in limp mode / restricted power mode. The ECU thinks everything is fine, but under load or certain revs (I had the same problem as you do now) the lack of fuel pressure triggers all other problems. New SCV's fitted and no more fault codes.
    Mmmmm interesting , but op com is stating egr every time, sometimes it says it's not present then as soon as I drive it comes up red and says its a present fault.
    Well got egr coming Thursday so will change that and then see, and will have to do scvs if needed.
    Does anyone on here change them or is it main stealers??

    Thanks for all ur input

    Nick

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