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Thread: 1.9cdti 150bhp 55 plate vectra idle speed problem

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    Default 1.9cdti 150bhp 55 plate vectra idle speed problem

    Hia, over the past few months my vectra has developed a strange fault whereby upon bringing the vehicle to a stop at traffic lights etc... seems to cause the idle speed to drop way below normal level and causes the engine to judder, before oddly returning to normal. The idle speed is then fine, all be it to repeat the abnormal symptom the next time.

    Just to let all know I have heard of problems with clogged up EGR valves so I have removed, inspected and cleaned it and although it was badly sooted up and now clean, it has had no evident results.

    Another thread on here spoke of MAF sensor's causing similar irritating symptoms, and was also wandering if anybody knows if they are serviceable, how easily they are removed and where are they located on this model?

    Any help from the people in the know or owners with similar problems would be greatly appreciated.

    Thank you, Jon

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    how long does it drop below normal revs m8, is it just a drop then back up or is it below for few secs ?

    You could try cleaning the throttle body possibly.

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    It can vary, but only slightly. Usually no more than 4 to 6 seconds, then normal idle resumes. May also be worth saying that the engine also occasionally has a slight missfire, but most times idles smooth. No problems with pick up and performance when revving.

    Thanks for the advice, is it difficult to get to? Are there any picture guides on here?

    Cheers

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    If the EGR is open at idle, then that can cause the engine to stall, but you've cleaned that.
    The throttle body controls the air intake between the normal inlet and the EGR, they are known to be sticky and cause erratic idle. Spray some carb cleaner into it to see if it's the cause.

    The MAF isn't servicable AFAIK, but some people use contact cleaner to clean it. Don't use WD40 or anything similar, and don't spray it too close. Disconnect the MAF at idle to see if that's the cause (will make the EML come on though).

    Good luck

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    Thanks, is the throttle body visible from the top of the engine bay? Or better accessed from below? what does it look like?

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    Quote Originally Posted by Whiteknight841 View Post
    Thanks, is the throttle body visible from the top of the engine bay? Or better accessed from below? what does it look like?
    right hand side of engine mate, big pipe goes into it bud, there is a how 2

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    Quote Originally Posted by Whiteknight841 View Post
    Thanks, is the throttle body visible from the top of the engine bay? Or better accessed from below? what does it look like?
    It's on the right hand side as you look at the engine (after taking the cover off). Look for the 'how to' on cleaning it. It's got three allen bolts holding it on and a big air pipe.
    I tried taking mine off, but couldn't get the access to one of the bolts. Plus my allen sockets are made of tin

    Beat me to it!

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    Brilliant stuff, will try both these things at weekend and post weather it has worked or not.

    Thanks for all the advice so far

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    Also check for any splits in the rubber hoses causing an air leak. Particularly the intercooler to throttle-body hose (big fat hose on the right) or small vacuum pipes.

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    Cleaning out the throttle body and indeed the entrance to the intake manifold thoroughly with carb and choke cleaner, appears to have corrected this problem. Now when the vehicle pulls to a stop the tick over calmly returns to normal.
    Just for anybody else who encounters this problem, on the base of the throttle body there is a printed circuit board inside accesible by prying off four metal prongs. I soldered some contacts inside which appeared to have bad joints. Dont know if this was related but could prevent problems long term.

    Throttle body, butterfly valve and entry to intake on the engine were all clogged up severely with snot and carbon. Took a lot of patience cleaning out. But definatley worth it as tick over is much smoother.

    Thanks to all who helped. All the best guys!

    Jon

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