New Mini owner - Cylinder 4 misfire and System too rich Bank 1 - HELP! - Page 6
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Thread: New Mini owner - Cylinder 4 misfire and System too rich Bank 1 - HELP!

  1. #51
    MT Regular
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    No, you are not Direct Injection.

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  3. #52
    MT Plus Member Astroboy's Avatar
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    Honestly mate, buy or borroe a compression tester
    Edit....now I'm getting my misfire threads muddled up

  4. #53
    Settling in at MT Emin-j's Avatar
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    Plugs and combustion chambers look pretty oiled up to me.

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  6. #54
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    Quote Originally Posted by Astroboy View Post
    Honestly mate, buy or borroe a compression tester
    Edit....now I'm getting my misfire threads muddled up
    Haha, not me! I already know that cylinder 4 has lost compression
    Also the head is currently off so zero sign of compression anywhere...


    Quote Originally Posted by Emin-j View Post
    Plugs and combustion chambers look pretty oiled up to me.
    Forgive the lack of knowledge - what is that a sign of?

  7. #55
    MT Plus Member CarsOrBikes's Avatar
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    they just look wet,

    compression? Rings worn, broken, or stuck, cracks, bore wear or gaskets as you say, worn or damaged pistons, bore wash, loose plugs, bad timing, bad cam, worn/defective or failed hydraulic lifters or rocker arms, aged or broken valve springs, sticking valves, burnt valves. Valve seat deterioration is reasonably common, and on these rings/bores perhaps if a hard life. All you can do really is remove the valves and inspect visually the seats with a view to lap them all in again, add new stem seals and refit the head. That part's dealt with then. You could while apart add some fuel or paraffin to each bore in small quantities and observe leak away as with the head, you could do it with the piston near the top, middle, bottom etc. You can try it after oiling each cylinder also in case they've become washed at all.

    Ultimately if it needs to come apart again it wouldn't be the first, but when someone has already removed it denying you an opportunity to do a leak test you have few options really I think, I certainly would rather pull the head a couple of times rather than wade in with a hone and rings or more like some choose to do but that's me. Going back to earlier comments I suspected there was more than one issue, I'm still of the same opinion in that it's possible but you're going to have to tackle one to explore another anyway which may just be ancillary.
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  8. #56
    Settling in at MT Emin-j's Avatar
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    Quote Originally Posted by timmyk86 View Post
    Haha, not me! I already know that cylinder 4 has lost compression
    Also the head is currently off so zero sign of compression anywhere...




    Forgive the lack of knowledge - what is that a sign of?
    I think if it were me I would be looking at overhauling the engine, ok if you have the time, tools and some mechanical experience, if not speak to COB.

  9. #57
    MT Virgin
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    Okay, so another twist in this tale.

    I took the cylinder head to an engine shop today, they vacuum tested the valves and guess what - they all seal well. No leaks. They also commented that the exhaust valves themselves looked fine.
    They kindly took some time with me to look at everything and the only thing they could come up with was worn valve guides, but not too bad and as I said they seemed to seal relatively well.

    So now I'm back to square one. A mini that misfires when warm and idling, and is currently in about 20 pieces. And it doesn't seem to be the cylinder head that's the problem.

    Where do you think I should look next?
    Also is there somewhere I can find a guide on how to refit the cylinder head properly? It might be that I do this and start back from the beginning.

  10. #58
    MT Virgin
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    CoB, did you see my PM to you?

  11. #59
    MT Plus Member CarsOrBikes's Avatar
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    https://www.newtis.info/tisv2/a/en/

    yes, thanks, will reply
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  12. #60
    MT Plus Member Astroboy's Avatar
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    I'd be more than half tempted to pull the pistons (which takes all of five mins with the sump off) and clean/inspect them. Then throw it all back together with ARP fasteners. It could potentially be something daft like your ring gaps have all aligned and got gummed up like that

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