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  1. #1
    Regular Member gaz1965's Avatar
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    Trim : SRI 150

    Engine : 1.9 CDTI

    Year : 2007

    Default Blanking egr

    Hi all do you think it's worth blanking off my egr? Will it effect performance? I'm getting my timing belt done next week so I might get them to do that aswell what do you guys think?
    Thanks gaz

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    If it aint broke don't fix it.

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    Regular Member Dan_BlackSRi's Avatar
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    Quote Originally Posted by wickedwillie View Post
    If it aint broke don't fix it.
    Always makes me laugh this, it is broke, it is making sure your inlet manifold is getting full of crud and will fail eventually (unless you do 90%+ motorway driving), I did many 000's miles in my old Vec with EGR blanked, and have done over 50K miles is various cars (VX, Ford, BMW) with EGR blanked/bypassed with no issues at all.

    Yes, blanking/mapping out the EGR operation does raise combustion temps, but not to a level where damage will occur, they are only lowered for emissions purposes, not for engine safety/reliability.

    There are very few engines where the EGR operation is built into the engine design to a degree where removing it will cause issues, Renault is one. Even BMW's used to have them vacuum operated with no ECU interference at all.

    At the end of the day its completely up-to the individual as to what they do to the car, but based on my experiences with this engine, blanking/mapping out the EGR has caused no negative issues - I can find no issues caused as a direct result of removing the EGR from a GM CDTi 150 engine.

  4. #4
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    Quote Originally Posted by Dan_BlackSRi View Post
    Always makes me laugh this, it is broke, it is making sure your inlet manifold is getting full of crud and will fail eventually (unless you do 90%+ motorway driving), I did many 000's miles in my old Vec with EGR blanked, and have done over 50K miles is various cars (VX, Ford, BMW) with EGR blanked/bypassed with no issues at all.

    Yes, blanking/mapping out the EGR operation does raise combustion temps, but not to a level where damage will occur, they are only lowered for emissions purposes, not for engine safety/reliability.

    There are very few engines where the EGR operation is built into the engine design to a degree where removing it will cause issues, Renault is one. Even BMW's used to have them vacuum operated with no ECU interference at all.

    At the end of the day its completely up-to the individual as to what they do to the car, but based on my experiences with this engine, blanking/mapping out the EGR has caused no negative issues - I can find no issues caused as a direct result of removing the EGR from a GM CDTi 150 engine.

    To be fair dan if the car is runnin fine with it then I personally wouldn't blank it. I blanked mine as I had a misfire and when I blanked the valve it cure it so my EGR valve was faulty.

    I will agree that if it's broke, I wouldn't be paying Vx for another one.

  5. #5
    Regular Member Dan_BlackSRi's Avatar
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    Quote Originally Posted by Gazza4 View Post
    To be fair dan if the car is runnin fine with it then I personally wouldn't blank it. I blanked mine as I had a misfire and when I blanked the valve it cure it so my EGR valve was faulty.

    I will agree that if it's broke, I wouldn't be paying Vx for another one.
    The main reason CDTi owners are replacing their inlet manifolds is due to the build up of crud from the EGR, so why wouldn't you blank it/map it out before the problems start (if you would when they do)..??

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    Quote Originally Posted by Dan_BlackSRi View Post
    The main reason CDTi owners are replacing their inlet manifolds is due to the build up of crud from the EGR, so why wouldn't you blank it/map it out before the problems start (if you would when they do)..??
    All I'm saying is if it's not broke is there certainty it will? If you're going for a map then by all means map it out but if there's no problem sorry m8 I just don't see the point.

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    Regular Member DAVIDD88's Avatar
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    agree unless its needing replaced leave it

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    I blanked mine but it was giving hassle, as said if it's fine, leave it.

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    Does it have any negative effect?

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    Quote Originally Posted by xtrem3x View Post
    Does it have any negative effect?
    It raises combustion temperatures, hence exhaust gas temperatures at part throttle. Issues which which can arise are turbocharger failure.

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