bad idle or overheating after stopping?
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Thread: bad idle or overheating after stopping?

  1. #1
    Registered User schoppa's Avatar
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    Default bad idle or overheating after stopping?

    Hi,

    today we had about 28 degrees (82.4 F) in Germany. I had a day off and cruised around in the city, basically to buy some beer for Silverstone meeting next weekend (feel free to meet me for a good German Holsten beer from the boot of BI ZT 260) After a short stop and restarting, the engine idled like running rich or some cylinders are missing. Pushing the throttle to 1500 rpm the engine sounds well. After driving a few miles on the high way back home, ideling was well again, no problems. The problem is reproducible in hot weather after each stop and engine turn off. Any ideas?

    Cheerio
    Marcus

  2. #2
    #242 V8 on tour colintf's Avatar
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    Quote Originally Posted by schoppa View Post
    Hi,

    today we had about 28 degrees (82.4 F) in Germany. I had a day off and cruised around in the city, basically to buy some beer for Silverstone meeting next weekend (feel free to meet me for a good German Holsten beer from the boot of BI ZT 260) After a short stop and restarting, the engine idled like running rich or some cylinders are missing. Pushing the throttle to 1500 rpm the engine sounds well. After driving a few miles on the high way back home, ideling was well again, no problems. The problem is reproducible in hot weather after each stop and engine turn off. Any ideas?

    Cheerio
    Marcus
    Don't worry Marcus
    Most do that in hot weather stop start or queues

    See you at MG Live for a beer and a chat
    Where you camping? General or quiet campsite??
    colintf
    Colin Murrell
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  3. #3
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    This is just a hotstart problem due to the high under bonnet temps. What happens is the fuel rail gets hot and the injection system has to get rid of the fuel vapour in the rail. It does this by holding the injectors open longer to let the vapour out of the system. There is no return to the tank in the Ford system which means that unless the car is using more than idle fuel amounts there is not enough fuel flow to keep the injector rail cool.

  4. #4
    Registered User schoppa's Avatar
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    Quote Originally Posted by colintf View Post
    Don't worry Marcus
    Most do that in hot weather stop start or queues

    See you at MG Live for a beer and a chat
    Where you camping? General or quiet campsite??
    Ah, I understand. I know this behaviour from my old BGTV8, but didn't thought that a modern car has this problem too. Okay, if this is normal I have to live with it.

    I'm leaving Germany tomorrow and stay in the south for a few days before going to Silverstone. I contacted the MGOC garage as well and hope that they give me a time slot and can help me with my AC problem (I've posted that a few weeks ago).

    I've booked general campsite. Yes, please come over for a beer!

    Cheers
    Marcus

  5. #5
    #242 V8 on tour colintf's Avatar
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    Quote Originally Posted by schoppa View Post
    Ah, I understand. I know this behaviour from my old BGTV8, but didn't thought that a modern car has this problem too. Okay, if this is normal I have to live with it.

    I'm leaving Germany tomorrow and stay in the south for a few days before going to Silverstone. I contacted the MGOC garage as well and hope that they give me a time slot and can help me with my AC problem (I've posted that a few weeks ago).

    I've booked general campsite. Yes, please come over for a beer!

    Cheers
    Marcus
    Gutes Fahrt Marcus
    See you next Friday
    colintf
    Colin Murrell
    vin 00242 - Probably the only 260 to have driven the full Le Mans circuit?
    MG Car Club Z Register V8 ZT/ZTT Rep.
    MG Car Club V8 Register V8 ZT/ZTT Rep
    MG Car Club MGF Register Regional Rep for Devon & Cornwall and Cotswold Regions.
    MG Car Club MGF Register International Liaison Representative

    http://www.mgfim.org/

    http://www.two-sixties.com/main.htm

    http://www.v8register.net/

    http://www.mgfregister.org/

    http://www.racethemg.com/ http://www.triple-mracing.com/



    Member of MGCC (UK), MGOC, VSCC & TSSC (Triumph Sports Six Club)

  6. #6
    "Beast of the Night" NOCTURNAL's Avatar
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    do you still have this Issue Schoppa ?

    Whilst Mine has it Now, I don't subscribe to the "they all do that Sir" routine, as Mine didn't for 5 Years, so want to know whats changed ...

    Just wondered if you had encountered it at all, ?

    Nick
    Nick

  7. #7
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    Has no one suggested "remove the sound proofing/Under bonnet insulation?.

    That will hold the heat in.
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  8. #8
    "Beast of the Night" NOCTURNAL's Avatar
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    I've seen that Andy, but that doesn't give a reason in my case why it didn't used to do it for the first 5 years plus of ownership, but I have another problem now in that the Fan isn't kicking in so I won't post further on Schoppa's thread.. I commented as I've seen Brians technical description for it (the normal Hot weather/traffic syndrome) and whilst I would never question Brian's knowledge in the slightest, I have zero Car knowledge, However as an Engineer, I'm inquisitive to find out why this should start happening to a car that has previously not suffered?

    My own car had never suffered for years of ownership, I had one incident, looked here and found Brian's equivalent statement in another thread, never had another incident...

    I've recently started getting it the last two summers, and now have similar symptoms that are obviously related to another fault, SO my comment was really why would it start happening to a previously unaffected car? (my current predicament aside as thats different affecting in cold weather as well and one for another thread.)

    Nick
    Nick

  9. #9
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    Quote Originally Posted by NOCTURNAL View Post
    I've seen that Andy, but that doesn't give a reason in my case why it didn't used to do it for the first 5 years plus of ownership, ................Nick
    Umm. I have been lucky it has never happened to me.

    I did remove mine within a couple of weeks of ownership but that was due to it dropping onto the engine.

    There were 5 of us in the 35 degrees of Croatia and it did not happen to any of us, even after 2 days where the cars were parked up in the heat outside the hotel.

    Maybe it is a drop in fuel pressure due to age or a very small hole in the system that is too small to allow the fuel to leak. (Just a complete guess)
    ZTT400 SHM Pearl Black #519 "Super Brick"
    ZTT260 Starlight Silver #428
    ZS180 x 3: 2 x Trophy Blue Hatchbacks, 1 x Le Mans Green 4 door. (Loads of ZS bits For Sale)
    ZR160 3 door XPG, Road Racer, "Rabbit" FOR SALE
    Triumph Bikes x 2. 1999 Speed Triple, 2011 Street Triple

  10. #10
    "Beast of the Night" NOCTURNAL's Avatar
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    Quote Originally Posted by AndyG View Post
    Umm. I have been lucky it has never happened to me.

    I did remove mine within a couple of weeks of ownership but that was due to it dropping onto the engine.

    There were 5 of us in the 35 degrees of Croatia and it did not happen to any of us, even after 2 days where the cars were parked up in the heat outside the hotel.

    Maybe it is a drop in fuel pressure due to age or a very small hole in the system that is too small to allow the fuel to leak. (Just a complete guess)
    (cool thanks Herman, dropping back from WYSIWYG editor has indeed allowed me to quote again )


    Kind of my theory Andy... something must be changing/degrading/wearing out?? I have separate issue now anyway, but am still interested in the resolution to the more general issue.

    Nick
    Nick

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