Mgzt260 slight missfire
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Thread: Mgzt260 slight missfire

  1. #1
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    Default Mgzt260 slight missfire

    Hi all

    just got my zt260 this weekend and loved driving it back from leeds

    couple small things I need to iron out....sometimes when I start it there?s a a slight missfire like it?s slightly flooded and has to clear it?s throat....it?s just had a new set of coils and plugs so not sure if a sensor is misreading or the injectors need cleaning

    it?s also just had an inlet manifold but before I start second guessing thought I?d ask if there?s anything common

    im a rover nut and also got a rover 827 vitesse mk1 that I?ve restored but love the zt260 especially as it has the XPower exhaust on it....love the burble

    also think might need front arm bushes and 4wa but will get round to it soon

    regards Rick

  2. #2
    #829 called 'Olive' David's Avatar
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    Welcome, Rick!

    Get a code-reader on to the OBD-II port and see if there any codes or pending codes showing. That may give you a clue. Do you have service history? Were the plugs and coils changed in an attempt to resolve a known misfire for example. If the intake has been changed, check that there is no coolant in any of the plug recesses. The gaskets can leak if the intake is badly torqued down (Dorman-type intakes tend to be more unreliable than the OE Ford or MGR intakes; do you have any indication of the make of intake was fitted?). If it has been raining recently, look for any sign of rainwater in plug recesses, particularly #8 is at the back, right hand side as you look at the motor from the front. That one gets the screen-washer jet/rainwater leakage sometimes.

    As you probably realise, there are many possible reasons for a slight misfire, and it is very difficult to be more specific without some clues, or having the car in front of you.

    Do you have the last 3 digits of the VIN, please? That may yield some information about the car's history which could help. I any event, it's a good idea to join the club as a full member, which will give you access to a wealth of valuable information, some of which is in Forum Sections for "full members only". Essential for a 260 owner.
    Send a PM to Tim here to get a questionnaire (please excuse blatant advertising !!).

    David
    Last edited by David; 16-06-2020 at 09:42 PM.

  3. #3
    Administrator Nich's Avatar
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    Welcome along Rick, I can only echo what David has already posted.

    Nich.
    Nicholas John Peter Tinker - # 484

    Manufactured on Tuesday 27th April 2004 @ 12.17.47.
    Commission Number: 24468.
    Brochure Model: M3 Tourer 4.6 V8 260PS.
    Specification Code: L01B.
    CICode: D1511.
    Trim Level: TL8.9 (M3).

    65th ZT-T 260SE to be made out of 115.
    11th ZT-T 260 SE in Pearl Black (PBT) out of 23 produced.

    Manufactured in the UK by MG Rover Group Ltd.


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    Thanks david

    ill plug a code reader in at work Thursday...

    I know it’s number 107....I think he had it done at a mg specialist....I’ve got receipts so will have a look on parts etc....my mechanical work is a v8 nut and an ex hola ya race engine builder so will get him the have a look....I’m taking my race car to rollers tomorrow...Bmw v8 that one but will investigate....the car had just been washed so might be a water issue....just want to check the usuals before I start throwing money at it....really appreciate the help...love the car and looking forward to getting some jobs done on it

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    Sorry holbay

  6. #6
    #829 called 'Olive' David's Avatar
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    Quote Originally Posted by Racerm5 View Post
    Thanks david

    ill plug a code reader in at work Thursday...

    I know it’s number 107....I think he had it done at a mg specialist....I’ve got receipts so will have a look on parts etc....my mechanical work is a v8 nut and an ex hola ya race engine builder so will get him the have a look....I’m taking my race car to rollers tomorrow...Bmw v8 that one but will investigate....the car had just been washed so might be a water issue....just want to check the usuals before I start throwing money at it....really appreciate the help...love the car and looking forward to getting some jobs done on it
    Sounds good. I think the car had done very few miles over the last couple of years. When brought out of hibernation it may have had some 'old-fuel' problems. Worth looking at the fuel filter under the rear seat squab (passenger side). Could be partially blocked. Check for garbage under the filter too; often missed, and will get sucked up. Check that a plastic clip has been fitted to keep the two halves of the filter held together (so called "orange clip", but often white!).

    Guess I can remove Jimmy Hutchinson's car from the 'Complete List of 260s For Sale' then

    David
    Last edited by David; 16-06-2020 at 10:04 PM.

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    Lol...yeah jimmy can be removed...nice bloke and honest about the car so I’m well pleased with it

    good call on fuel filters etc....I guess the 260 tank is quite different...are they the same as any Bmw parts

    I will fully join as plan to be a long term keeper

    i own a bmw approved body shop so happy to help with any body or paint issues if anyone is stuck

    i also race a 4.0 v8 Bmw 1 series and have Rob from Afm racing work for me...I will look into the mustang engine for mods over time Not that I plan to modify it much but he has already talked about e92 m3 throttle bodies ��

    im back at work tomorrow so will start to look into it

    anywhere better for parts ?

    thanks again

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    Registered User SCP440's Avatar
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    Just because it has new coils I would check what make they are, there are some very cheap options on the market and if they were fitted by a garage who knows what was fitted.

    Some of the performance options work well like MSD and make starting a lot better and not even a bad price if purchased from the right source.

    Steve

  9. #9
    #829 called 'Olive' David's Avatar
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    I think the intake and gaskets are at least the right ones (genuine Ford PI), since the ex-owner asked me specifically which ones on the Summit Racing list of items were the best to buy. He said at the time that he was going to do the intake swap himself. Not sure if he did take that route in the end. I mentioned MSD's to him too, but again don't know which direction he took. If they are red, Rick, they are probably MSD's; not certainly so though!

    The club shop sells a few handy bits engine wise, including a larger throttle body, silicon hoses, cold-air intake tube etc.
    Other important bits like brake discs and pads, heater valves, shock-absorbers and so on too. Only open to you when you become a full member though.

    David
    Last edited by David; 17-06-2020 at 11:45 AM.

  10. #10
    Registered User anthony27's Avatar
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    Mine has always been a bit hiccoughy when starting a warm engine, but works fine otherwise. It's good to leave the ignition on for 5 seconds before you turn the starter.

    Do check the fuel filter - it is a 'fit for life' item and often is never changed. But it can disintegrate after 18-odd years.

    Welcome and have fun with your 260 !
    MG ZT-T 260 in X-power grey, n° 555, LHD
    MG TF 160 BRG, LHD
    Lotus Evora 2010 Platinum silver LHD

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