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Thread: Occasional engine noise, slight rough idle, poor MPG

  1. #1
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    Default Occasional engine noise, slight rough idle, poor MPG

    Hello Guys, this is a complicated post to describe but hopefully a list of symptoms may help.

    I have a 2005 CDTi150 estate with 90,000 miles on the clock. Its been a great car but a few subtle issues have come up lately. 1st off my mpg is poor (I think) it averages 350 - 400 on a tank and computer says 35 -38 mpg. I thought it also had poor acceleration below 1700/2000 rpm but was told (by Vauxhall) it is turbo lag. I looked on forums and found mention of EGR valve issue which I took off and examined and was free as a bird so just cleaned it and put it back; I did not check it electrically. Also when cold and particularly when the weather is cold it had a distinct weird sort of rattly sound on engine decel as you take your foot of the gas. Once warmed up it seems to disappear. If you listen the idle sometimes I kind hear a very short version of this rattle, about 0.5- 1 s long; almost like a quick clatter. I have also noticed, and again it is not all the time that the idle speed cycles very slightly like from 800 to 780 and back.

    I took it to vauxhall and they said my 'swirly flaps' are likely sticking and/or motor that drives it may have failed. There cost is £1300 and 7 hrs work !! After the shock I wonder is this a DIY job and any way to verify. They also said that my flywheel was out of balance slightly and again said this would cost a similar figure?? So after being presented with more than £2500 of work I am understandably concerned. Any help suggestions would most gratefully received. Many thanks in advance.........

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    Full Member Big Sig's Avatar
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    I'd agree with what they said, although shop around.
    Now I need a turbo to keep up!

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

    Default

    Sounds exactly like sticking EGR symptoms.

    You can do a visual check of your swirls, check for movement and gunge etc.

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    Regular Member winnie2457's Avatar
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    Could be semi blocked dpf best advice I can give you is get some one to rev car and check your swirl rod moved if
    it does and moves back again it's fine

    Egr valve and boost sensor give a good clean

    check 3rd injector wiring and give it a squirt of wd40

    cHeck vacuum pipes on your engine sticky thread at top of this section

    Last of all give it a good rag and redline it
    in a few gears once warm to blast out the dpf and cat of soot build up


    And as for flywheel just live with it untill it gets too noisey then replace

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    Little update guys and many thanks for your help on this.

    I took engine top cover off a noticed the bar that links the flap valve mostly disconnected. It looks like I'll give Pete MCs washer repair a go. One thing I couldn't fathom is how the bar is actuated. It seems to have a hole where I presume some other linkage moves it?? I could see no evidence of some other part that moves this bar and thus rotates the flaps??

    Do I need to remove any further parts to gain access?? f things are much worse and I needed to change the manifold itself, is this a DIY task? How long would it take and what needs to be taken off ? any special tools etc?

    Also (excuse my ignorance) but what and where are the dpf and boost sensor?

    Again many thanks for your help guys

    Best regards
    Neil C

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    Regular Member barney490's Avatar
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    http://www.vectra-c.com/forum/showthread.php?t=88845 that link will help with the boost sensor. The DPF is the big box in the exhaust system, near the front with vacuum pipes going to it. It catches soot and performs occasionally what is called a regen, which incresaes mpg temporarily, as it pumps extra fuel though the system to increase the temp in the DPF to, i believe, around 600 degrees. This process happens when the car detects differential pressure in the DPF, ie as it starts to block. normally a good high speed run down the motorway help clear alot of crap.

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    Regular Member winnie2457's Avatar
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    the swirl bar is driven by the motorised black disc which is the 3rd one in from left looking at the engine the bar is connected and the 3rd one movesd which in turn moves the bar which move the rest in unison

    once br is back on then they should all move again if not then its a new motor thats needed which sits under the inlet manifold and is a pig to change with the manifold in situ they cost about 130quid for motor but ideally its best to do inlet manifold too which is about 450quid for the part

    hope this helps

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    and the manifold is a diy task if you have exprince and some balls but its quite a task i think garages take about 6hours to do it

    its possible if you have the tools and patience

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    Thanks to all who helped on this one. So far I went for the 99 p washer fix and so far so good; it has stayed on for a few days so far and moves fine. I cleaned the boost sensor and the EGR valve which were pretty sooty. The EGR valve was free to move; I also measured the coil resistance which was 10 Ohm; not sure if this is good? After all seems good the car again, it seems to drive a little better but no stellar change. Maybe my MPG will be back.

    On talking to vaux again; although you cannot buy the said bar hat connects the swirl flaps together (part no. 24437715), there is a service kit with the dubious title 'gasket set' but contains amongts gaskets a new bar and the flapper valves aswell as a 'field remedy' #2233. The part no. given for this was 93171601. Now, has anyone had experience of fitting this service kit? It is cheaper at £190 for the kit but is it easy to fit??

    Many thanks again in advance
    Neil C

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