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Thread: EGR Cleaned: Electrical Connection Query

  1. #1
    Regular Member barkzz's Avatar
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    Default EGR Cleaned: Electrical Connection Query

    Hi Everyone,

    My car went into VX the other week, i told them the performance was flagging on my sri 150. The said nothing, wrong, "laptop says no" scenario.

    Anyway, curiosity got the better, and ive had the EGR valve off today, which was choked full of ****. Needless it's all nice and clean, and the valve is moving much more freely now.

    I have however a potential problem:

    The electrical connection, that pushes up back onto the EGR seems broken. It was a swine to remove, but doesnt seem to lock in place when pushed back up?

    Ive pushed the yellow clip up into "lock mode", but am still able to pull the connection off. I've pulled it up as far as i can, but it doesnt seem t "lock" back on.

    Ive took the car out for a spin, and its performaing brilliantly without issues (No spanner lights, errors codes etc.), and much more responsive. So:

    1. Is there a way to remedy the clip- in connection? Have anyone had the same issue?
    2. If the electrical connection came off, would this result in limp mode/spanner light
    3. If it does come off, whilst driving will this cause any damage to the engine, and inlet?

    I'm just a bit worried that it's going to come off or something daft.

    Feedback greately appreciated

  2. #2
    Regular Member Ste's Avatar
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    Tie wrap it into position, or use another additional mechanical method of holding it there.
    No engine damage would occur if it came off, unless the loose wire went into the pulleys and belts and that would then make mincemeat of the wire

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    Full Member Big Sig's Avatar
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    Now I need a turbo to keep up!

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    Regular Member barkzz's Avatar
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    Quote Originally Posted by Ste View Post
    Tie wrap it into position, or use another additional mechanical method of holding it there.
    No engine damage would occur if it came off, unless the loose wire went into the pulleys and belts and that would then make mincemeat of the wire
    This is kost likely what ill do.

    Say it did disconnect (or isnt connected properly now), I would definately have some form of engine management light on wouldnt i?

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    Regular Member Ste's Avatar
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    Probably not immediately, but I don't know what the OBD reporting methodology is of this failure on your car.

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    Regular Member barkzz's Avatar
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    Quote Originally Posted by Ste View Post
    Probably not immediately, but I don't know what the OBD reporting methodology is of this failure on your car.
    Hmmm...based on the fact that i dont know if it's connected properly thts got me thinking?

    Ok..looking at it another way, the perforamnce would be dire if it wasnt connected then?

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    Regular Member keithsimmo's Avatar
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    Just out of interest did you clean both sides of the EGR Valve? The valve side and the Electrical solenoid side as well? ( requires a hole drilling and punching out )

  8. #8
    Regular Member Ste's Avatar
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    Isn't the valve operated by vaccuum? If so, the electrical connection is for the detection of the valve moving, and therefore reporting valve position.

    If the valve was moving, but the reporting was off, then the ECM would fuel according to default values (assuming NO MIL and derate interventions). Now firstly, would the ECM assume fuelling rates or fuel according to it's map and the sensory input and commanded throttle???? If it did, and it ignored that the EGR valve reporting was defective, then it would either assume a closed EGR valve and fuel accordingly (this would result in poorer performance, as the O2 content would actually be lower than assumed, as the EGR valve is actually open and working and therefore combustion wouldn't be as complete or as quick, resulting in more smoke).
    If the ECM assumed a position of the valve based on default maps, it could be wrong and it could restrict fuelling (and therefore performance) as to not cause any issues.

    OR if the engine recognised that the EGR position feedback was duff and it did take action, it would be to reduce fuelling and therefore performance to prevent other issues or problems.

    Or it simply could be getting the calculation wrong due to a missing input.

    Have I waffled on long enough?

  9. #9
    Regular Member barkzz's Avatar
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    Quote Originally Posted by Ste View Post
    Isn't the valve operated by vaccuum? If so, the electrical connection is for the detection of the valve moving, and therefore reporting valve position.

    If the valve was moving, but the reporting was off, then the ECM would fuel according to default values (assuming NO MIL and derate interventions). Now firstly, would the ECM assume fuelling rates or fuel according to it's map and the sensory input and commanded throttle???? If it did, and it ignored that the EGR valve reporting was defective, then it would either assume a closed EGR valve and fuel accordingly (this would result in poorer performance, as the O2 content would actually be lower than assumed, as the EGR valve is actually open and working and therefore combustion wouldn't be as complete or as quick, resulting in more smoke).
    If the ECM assumed a position of the valve based on default maps, it could be wrong and it could restrict fuelling (and therefore performance) as to not cause any issues.

    OR if the engine recognised that the EGR position feedback was duff and it did take action, it would be to reduce fuelling and therefore performance to prevent other issues or problems.

    Or it simply could be getting the calculation wrong due to a missing input.

    Have I waffled on long enough?
    Yes it's vacuum, hence the gasket between the EGR, and the inlet, to prevent air from escaping.

    So in a nutshell reduced performance as suspected .

    May have another look at the electrical connection today, as im not entirely convinved it's on properly. I've got it as far as it will go, but considering it doesnt lock on, and can just be pulled off concerns me.

    The only thing that may have happened, is the plastic retention clip getting damaged when removed, hence it doesnt lock back up again?

  10. #10
    Regular Member Ste's Avatar
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    Did you drill the back and knock out the bits for a clean, as the 'How to' describes?

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