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can anyone help? a renault megane scenic with no fault codes after running for 20 mins starts to hesitate on excelleration,new plugs fitted and one new coil.
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tony
These can be exasperating if they won't give you a code to identify which cylinder has the faulty coil. Try sequentially alternating your new coil with the others. [Or, if they're Sagem and dated before 330-3; try getting a whole new set free from Renault. Go for Denso ones if you can.] Those new plugs: were they genuine plugs from the dealers - these things just hate some makes of plug.
Given recent weather conditions and the Scenic's well-known scuttle design fault; any sign of rain water in any of the plug wells?
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ngk plugs.i will try alternating the new coil. water was not in the plug wells but rust staining was found on cylinder 2 and 3. the new coil is fitted to cylinder 3 the make is beru.
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Tony
The coils are wired in two series. 1 and 4; 2 and 3. Usually it's a HT side fault, so that doesn't cause a problem; but if one coil shorts internally on the LT side, it can also affect it's "pair."
The plug-well "tide mark" is significant; once the water gets past the coil's rubber seal and gets trapped, it causes internal tracking inside the coil and that could fit your symptom. Beru are a lot better than Sagem; but not quite as good as the Denso ones - I've never seen a [dry] Denso one fail yet.
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