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Thread: Rough idle - a seeming cure at last

  1. #1
    Regular Member Darklord's Avatar
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    Vehicle : Vauxhall Vectra

    Trim : LS/Life

    Engine : 1.8

    Year : 2004

    Default Rough idle - a seeming cure at last

    Well I've tried a lot of things - full services, cleaning the throttle body, new coil pack, ya de da. All these things made incremental improvements, especially the coil pack, noticeably smoother running. But the idle was still Ill mannered at times, with popping and missing.

    But I can cautiously report a solution - a speculative can of "Cataclean" fuel treatment. Now I've tried other treatments previously, and I've done long journeys on full tanks of super unleaded, all to no avail. But this stuff seems finally to have got somewhere. Within about 15 min I could feel a difference, and it's remained fairly steady and consistent for over a week now, with the engine sounding even smoother than before.

    So I'm going to add another bottle next week - clearly it's dissolved something, and given the previous neglect, another dose can't do any harm.

    It's one of only 2 products that I've ever tried that actually made a noticeable improvement - the other being Millars Sport 4 diesel treatment that made a Mondeo tdci run properly.

    So for all you 1.8 owners, I recommend Cataclean - it's certainly made a difference in my car.

  2. Likes vectra ste, northpole liked this post
  3. #2
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    Vehicle : Signum

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    Engine : 2.0T

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    Quote Originally Posted by Darklord View Post
    I've done long journeys on full tanks of super unleaded, all to no avail.
    Good to year that your problem is sorted. Super unleaded, however, isn't designed to tackle problems such as rough idling. It has two benefits; some engines with knock sensors will retard the ignition until knock occurs and then dial it back a little. Super unleaded allows these engines to retard the ignition more than 95 octane fuel. Secondly, SU often has better cleaning agents in it, as an inducement to pay the higher unit price, but to benefit from that you would need to use it for an extended period of time.

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    Vehicle : CDTi

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    I have a friend that bought an Astra with a slight misfire and EML flickering, a lot of money had been spent by previous owner to clear it, a bottle of injection cleaner on a 1/4 tank and it was fixed in about 5 miles, never had a problem after.

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    Vehicle : Vectra C Hatchback Facelift

    Trim : Club

    Engine : Z18XE

    Year : 2005

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    These symptoms can be a pointer to a MAF sensor problem accompanied by DTC P0170...where cleaning the MAF sensor filament might offer a cheap & effective cure..just posted this https://www.vectra-c.com/forum/showt...=1#post2508343 . My experience with an apparent 'dirty' MAF sensor, although I had an engine warning light & the DTC P0170 but non of the symptoms of a rough idle that you had amongst others. It might be of interest to you.

  6. #5
    Regular Member northpole's Avatar
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    I would run another dose if it cured the problem just to make sure.

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