Question about 2001 Audi A4

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Every so often or especially when it rains heavy my car looses power while driving and cuts out when i loose speed. it will start again straight away but will cut out again instantly blowing a lot of smoke out the exhaust

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Unsure if your engine model is same as ours here,but rain or heavy dampness usually shows up leakage in sparkplug wires and insulators.They give this exact problem.this model here has long extended rubber/plastic insulators that run through the valve cover to the sparkplugs.If the sparkplugs havent been replaced for a while(some of these have platimun or iridium plugs that should run 60-100,000km).the current needed to fire them increases.it will always take the easiest pathway to earth,and often it is through the side of these long insulators.Itg will be hard to see as the hole is only pin sized but will have a small build up of black carbon around the hole.'Also when the fault is evident,you should be able to lift the bonnet and hear little crack sounds as they leak and the engine will misfire when this occur.Hence the loss of power,the plugs wont be firing each time that they leak.
A new set of sparplugs and leads should fix this.If it is the direct fire model that has an individual coil over each sparkplug,you can purchase the insulators separately.The coils should be fine or they would fault in any weather.Hope this helps you

Posted on Mar 22, 2011

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