Question about 2002 Audi A4

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Audi a4 18T tubo model 2007 why does it mis only when it idils

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It could be a few things, but my guess is a fouled spark plug. This could also be a sign of a bad ignition coil, clogged air filter or something wrong with the air sensor, or a major issue like a leaky head gasket. Start with the easy stuff like the air filter and the spark plugs. Also, try to borrow or pay someone to read the fault coded with a VAG-COM, at the very least it will tell you which cylinder is misfiring.

Posted on Apr 22, 2013

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Check for any air leaks on the inlet system.these models uses quite a few small rubber vacuum hoses for various functions like manifold flaps, fuel pressure regulator and turbo actuator and dump valve. any air that is sucked in by the engine after the airmass meter is known as false or unmeasured air, resulting in a lean mixture at low revs. get some carb cleaner and spray it all over the inlet system and injector seals while the car is running.if there is a leak, the idling speed will change when it sucks in the carb cleaner.

Posted on Jul 08, 2013

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Peugeot 206 1.4lx 2001 mis-firing and idiling eractically


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it could be a problem with the injector for that cylinder(dirt or electrical).how are the other plugs do they need to be replaced.

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My biuck has a mis i hear it from the tail pipe then while idiling the service engine light comes on then when when i drive it the light goes of is that the coil pack i changed the spark plugs.


This could be from a faulty fuel injector. What I would do, is when the engine is running, pull off 1 injector connector at a time to see which one is bad. When you pull off the connector, engine rpms will drop a lot. If it doesn't, that would be your bad one.

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Very weird, a bad cat should not make it mis-fire, if it is just one cylinder it is mis-firing on, its worth checking the coil pack for that cylinder

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