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Engine has slight mis-fire, which hasn't gotten any worse for about 6K miles. AS it is now due for a major service anyway I want to change plugs before changing anything else. Currently running Bosch Super 4 (FR78X I think), but have been told that these are prone to causing mis-fire as some can fail early (?). Does anyone have experience of this and what other plugs (NGK Model?) are recommended for the non turbo 1.8 20V Passat
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Any misfire is bad news for a catalyst. May be failure time next MOT.
Coils are the usual problem with petrol VAG cars.
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I wouldn't use Bosch plugs from choice- I've had a few faulty ones and some of my garages refuse to fit them as a rule. We get very few probs with NGK one though
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Glakit wee skunner says:
it's usually the coils with VAG. the ADR engine doesn't use the individual coil packs, it uses the dis-unit that covers cylinders 3 & 4, with flying HT leads to 1 & 2. Is it likely to be the Dis-unit or the flying leads. Is it possible to get them tested without having to fork out (the leads are £70 for the pair and the dis unit is £200 +) As it hasn't got any worse for 7K + miles I'm not sure if it's any of the above. Also the timing belt was changed around the same time, if the belt is out by 1 tooth would this cause the same mis-fire/ lumpy runningproblem?
Any help appreciated.
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Use the Bosch original equipment (OE) spec plug which is FR7LDC+.
The FR78X's are the much rationalised/compromised Super 4 range that everyone is wowed by the four earth electrode design.
HTH
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The FR78X's are the much rationalised/compromised Super 4 range that everyone is wowed by the four earth electrode design. HTH
HTH more info please
TIA
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