Help! My dad used to service my car, but he recently died, so I am trying to remember what he taught me. I changed the spark plugs on my Daihatsu YRV, which had 3 prongy-things, but the ones that I was assured by the motoring shop were the correct ones, only had 2 prongy-things. After having driven about 30 miles, the malfunction indicator light came on (orange, engine logo).
I rang Daihatsu who were surprised that 2 prong-thing sparks would have caused this to happen, and suggested putting the old ones back in, which I have done. I started the engine after putting the old sparks back in, but the MIL was still on, which is really confusing me.
Is it possible that changing the spark plugs did this? I replaced the air filter at the same time.
Does it take a while for the light to go off, after all, it took a while for it to come on?
Have I knackered the engine?
Is there some other reason for the light coming on?
I'd be grateful for any help, especially since my oracle is no longer at the end of the phone to help me.
Cheers
FF
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I'm afraid I can't help you too much with regards to why the engine light did come on. What I can say is that, I *think* (dangerous for me) that even if you fixed the fault that caused the engine light to come on, it would need to be reset before it goes out. Therefore, applying that logic if it was the spark plugs that caused it, putting the old ones in may well have fixed the fault even though the light still stays on.
I seem to remember reading somewhere that the Vauxhall Omega resets that light if the fault has been fixed after so many ignitions on.
I should point out for your safety that I am in no way mechanically minded.
I just like helping people :-)
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Adam
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thanks Adam. My husband also wondered about the resetting business, as he says that is typical computer behaviour. The only thing to add is, I understand the engine is the same as in a Toyota Yaris - not sure if this is correct, but it's a 1.3.
F-F
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Bit thick - I don't know what bump means! Hope it's good, though.
I think you were right about the re-setting after a certain number of ignitions - the light didn't come on after my mammoth weekly shop yesterday. Phew. Correct spark plugs are now on order.
Cheers.
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Bit thick - I don't know what bump means!
It means that Adski has 'bumped' it back up the list in an attempt to grab some fresh ideas. Another way is to post 'BTTT' (back to the top)
DD.
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Let us know when you've fitted the new plugs.
If the light's gone off then I shouldn't think it'd be too serious...
...he said.
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Adam
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Modern engines often have a knock sensor that detect pre-ignition -- the mixture burns so fast it produces a pingk sound. (we used to call it pinking) If it pinks it can put the light on, depending on how the electronics have been designed.
I would expect the light not to come on again, when you re-start the car, unless it is still pinking, but this is dependant on how the electronics have been set up by the anufacturer.
You should ensure that you use plugs as specified for the car. They have to be of the right heat rating. If they glow hot they can cause this trouble.
(Incidently, I thought 3-prong plugs went out with the ark?)
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(Incidently, I thought 3-prong plugs went out with the ark?)
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That's right. They went in two by two. Adam would only have needed to take on board 2 prongs.
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The current BMW twin cylinder bike engine has three earth electrodes. No way to adjust them once they are out of tolerance.
What is their advantage- less prone to causing misfires maybe?
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I wasna fu but just had plenty.
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I was under the impression that the only difference between three and two pronged plugs was that the 3 pronged plugs last longer. The spark will just jump to the nearest electrode. Three prongs last longer than two.
I shouldn't think that putting two pronged plugs in would cause the problem you are having. Maybe something was knocked, or maybe a co-incidence?
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I have finally fitted the new spark plugs and success - the engine warning light has not lit up! Thank you all for helping,
F-F
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