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Thread: 1.9CDTi Auto Hesitating Problem

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    Default 1.9CDTi Auto Hesitating Problem

    Hi everyone.
    I've got a Sept 2006 150 CDTi SRi Auto which I aquired when it was about a year old from a car supermarket. The car ran fine once moving but from pullaway I noticed a tendency to 'hesitate'. Just slightly - when you pulled away it started to move but then a moments hesitation followed before it got it's act together. Also, never had a turbo before but, at around 30-40 mph, there was very noticable surge as the boost came in. I understand turbo lag but I'm surprised that a modern 'family car' would be put on the market with such an ailment so I wonder if there is an association with the hesitation problem.
    Car went into vx under warrenty and they said it was the swirl chamber and replaced the manifold (and bracket?). There was a marked improvement in the performance but the problem was still there. Now, however, it was every so often rather than all of the time and much more noticable when it did happen - effectivly total power loss for at least a second or two. I noticed the problem seemed to be more prounounced after a period of sustained high speed driving and then coming to a total stop, say, at a roundabout. It went back in and they changed the EGR valve. That made a signifcant improvement and I had a full 5 or 6 days without the problem but then back it came - infrequent but pretty bad when it did happened. It's recently been back in again and this time they have played around with the gearbox settings. No noticable change at all regarding the hesitating but now the car is less tractable to drive.
    As with many problems you can drive round it but I won't let my wife drive the car on busy roads - it's one thing when it lets me down but I wouldn't like to put her through the experience of having a 40 footer bearing down on her when you pull out on a main road and the power goes on holiday!
    Looking around the site I have seen one other reference to hesitating but all suggestions have already been carried out bar the mod to the wiring loom. Could that be the problem? If anyone has any advice before I put it in for it's service I would be very grateful.
    cheers

    Malc Farmer.

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    Regular Member mushy2007's Avatar
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    I had the same setup on a siggy and if what you mean you press the gas and it doesnt responed straight away, unfortunately thats the vx auto for you.

    I have driven loads of autos and the vx one appeared to be the slowest to respond.

    In the end I kept the brake half way up as the engine kept the gear engaged ready to go.

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    I know what you mean about keeping the throttle down and using the brake to keep the car from pulling away but no, this is a definite, drop in power.

    I guess the best way I can describe it is to liken it to an old Ford 4 cylinder Kent petrol engine (as per Anglias and early Cortinas/Escorts) with a faulty accelerator pump/jet in the carb. Engine ticks over fine but when you put your foot down to pull away, the butterfly opens and the engine gets lots of air but no splash of fuel and for a few seconds the engine starves and dies. Then, as the revs pick up the running jets are able to provide enough fuel. Showing my age there a bit but probably best way I can explain it.

    The difference is that this is infrequent and on a modern diesel with engine management etc.

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    ive got an 1.9cdti sri auto and mine is the same nothing then wham ! bit scary when pulling away lol! but am looking into the air box mod and getting a re map by dap performance that is what others have said will help a lot but not full cure hope this helps

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    Regular Member Blagmeister's Avatar
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    Is this not something to do with the "intelligent" neutral facility built into the auto box, when the car is stationary
    ?
    I have found that if I bring the car to a complete standstill, and then subsequently pull away, there is a moments hesitation - almost as if the car is going from neutral to having drive engaged. However, if I don't allow the car to come to a total stop, then response is immediate.

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    Regular Member Jeff Lynne's Avatar
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    Had a similar thing with my 535d, as it always pulled away in second from a standstill. If you gave it some welly, then it would change into first. Not good at a roundabout as there was a delay while it changed down. By the time it had, you had your foot down even more due to the delay, and all hell broke loose at the rear tyres.

    I got round it by selecting sport mode when pulling away. This was easy on the BMW as you just pushed the lever across into sport mode and it would then pull off in first.

    Not familiar with the VX auto but does it pull away in second normally ?

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