3 cylinder gs
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  1. #1
    Fellow Frogger!
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    Default 3 cylinder gs

    Rear left (no2???) Being lazy. Has spark . New leads, new plugs, just refuses to help rest of engine. does seem to be very light on fuel in cylinder. Any one have any ideas .

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  2. #2
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    Hi tassy,
    The most sensible thing to do is to test the compression. You might even do a simple hold a piece of rounded dowell or similar in the plug hole and compare it to a good cyl if you do not have a gauge.
    Another suggestion if no gauge is to turn the engine over by hand and see how the 4 cylinders feel for a comparison of the compression.
    Poor compression, then check tappets, head tightness ?? Or some other thing worse.
    Jaahn

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    Assuming your engine has a single carby, then the only reason for one cylinder to use less fuel than the others will be lack of compression - this will reduce it's ability to suck in fuel/air mixture as piston goes down...

    Cheers

    Alec

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    1000+ Posts Wildebeest's Avatar
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    tazzy,
    Inlet manifold gasket leak on offending cylinder.
    Valve seat recession. Can be picked up by zero valve clearance on same.

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    Give it a stern talking to and tell it to pull itself together.
    Craig K
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    Gave her a new carby, new plugs ,new leads, forgot about the stern talking to, unfortunatelly i don't speak french.

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    Did that work?
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    1000+ Posts Wildebeest's Avatar
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    tazzy,

    "Gave her a new carby ?" After a bit of a headscratch I recalled a 404 having a one cylinder miss. Turned out to be a badly worn throttle shaft on its Solex 34 pbic. This caused the fuel mixture distribution to be non existant on the faulty cylinder.
    Located by 'jiggling' the throttle shaft.

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    The "sophisticated" diagnosis is always the best
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    1000+ Posts Wildebeest's Avatar
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    tazzy,
    ..and the good news is ?

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    1000+ Posts Wildebeest's Avatar
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    tazzy,
    ..and the good news is ?
    Last edited by Wildebeest; 2nd November 2016 at 02:00 PM. Reason: dual posting

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    Quote Originally Posted by Wildebeest View Post
    tazzy,
    ..and the good news is ?
    decided to rebuild one of the heads i have laying around and replace the head completely as i will need to wait for parts could take a little time reporting further, thank you all for your concern will let you when she is up and running again.

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    Hi tazzy,
    Your plan may be a good one, but over the years I have found it is always good to actually diagnose the problem. If you do not, then you run the risk of finding the problem is still there after you replace the head. BUGGER Just saying from experience !
    Jaahn

  14. #14
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    I agree and in saying so have done a dry compression test and came up 150 across all 4 cylinders, will follow up with a wet test just to see. Have ordered new dizzy cap and coil. So having a little bit off fun tracking down her problems.

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    150 is plenty high. Per chance is the timing belt a tooth off? Don't ask me how I know to ask this.

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    Hi
    Yes 150 is ok and if even between the 4 then the problem is not there !

    If you suspect the spark is the problem then the quick answer is to do a check in the dark. Start it and get under the bonnet and give it a full throttle blip, to load the engine for an instant. Not high revs but full throttle required for a second. Repeat as you look at the different parts. So do it where it will not annoy the neighbours

    Observe the ignition leads, boots, dissy cap and coil while you do this. Any breakdown in the insulation will be accompanied by flashes of spark leaking away to the closest metal. You might be surprised how many leaks you see. Use a mirror if necessary. 3 hands is "handy"
    jaahn

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    1000+ Posts Wildebeest's Avatar
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    tazzy,
    Another one from my past, [got a million of 'em].
    Case one. 4 cyl Volvo B20 missfire. Compression test showed all equal and good. Found to be very badly worn cam and follower.
    Inlet valve was opening, just, allowing the compression reading OK at cranking speed. A different kettle of fish with the engine running.
    We need a camshaft guy to explain this better than yrs trly.

    Case two. Volvo B21 E. missfire. comp. tests etc OK. Turned out to be a broken valve spring.


    This is the part of the trade that I've missed. You can stick your ECU's

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