h25 miss new plugs and coils tested

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benorange
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h25 miss new plugs and coils tested

Post by benorange »

what could it be? it gets worse the hotter it gets. could dirty fuel fuliter do it.
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Smurf
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Re: h25 miss new plugs and coils tested

Post by Smurf »

HT leads breaking down?
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benorange
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Re: h25 miss new plugs and coils tested

Post by benorange »

Smurf wrote:HT leads breaking down?


does not have them cos has coils on top of each spark plug
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churchill
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Re: h25 miss new plugs and coils tested

Post by churchill »

AFM? Have you done a compression test?
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benorange
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Re: h25 miss new plugs and coils tested

Post by benorange »

churchill wrote:AFM? Have you done a compression test?



think in wrong sort of miss as it comes and goes. like it only small when idling and there when driving but if you plant it it will sometimes kick in.
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Big-AL
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Re: h25 miss new plugs and coils tested

Post by Big-AL »

my brother had this on his 1800cc suzuki wagon, which has the same 4 coil over spark plug set-up. he found that he had to run it on 95 petrol. 91 and it had the miss, 98 and it had the miss, 95 and it ran perfect :? maybe a slight timing issue???
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benorange
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Re: h25 miss new plugs and coils tested

Post by benorange »

Big-AL wrote:my brother had this on his 1800cc suzuki wagon, which has the same 4 coil over spark plug set-up. he found that he had to run it on 95 petrol. 91 and it had the miss, 98 and it had the miss, 95 and it ran perfect :? maybe a slight timing issue???



odd but will have a play with that
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kernels
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Re: h25 miss new plugs and coils tested

Post by kernels »

If you're pretty sure it's not spark related, then I would check the fuel injectors, sounds like it could be fuel injector not opening properly - when idling there is just a little miss because it doesn't have to deliver as much fuel, under load it delivers more fuel or fails to do so and you notice a bigger miss-fire. Maybe a dirty connector or dodgy fuel injector ?
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benorange
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Re: h25 miss new plugs and coils tested

Post by benorange »

kernels wrote:If you're pretty sure it's not spark related, then I would check the fuel injectors, sounds like it could be fuel injector not opening properly - when idling there is just a little miss because it doesn't have to deliver as much fuel, under load it delivers more fuel or fails to do so and you notice a bigger miss-fire. Maybe a dirty connector or dodgy fuel injector ?


yea was going to play with that tonight till a workmate droped a heavy brass valve on my head and then put me in a nd e to get scalp stapled back together and being told not to do anything till monday. (planning to work on it tomorrow.)
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