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russdeebrown
22-07-2009, 09:25 PM
Audi A4 B6 1.8t

Have fault code

16684 - Random/multiple cylinder misfire detected.
P0300 - 001 Upper Limit Exceeded.

Any ideas

Crasher
22-07-2009, 09:33 PM
Not necessarily, it has not picked up an individual cylinder ID which is what you would expect to see in addition to the random/multiple code.

russdeebrown
22-07-2009, 09:42 PM
My mistake. Full Reading

Just ran VAG

Given me fault code

16684 - Random/multiple cylinder misfire detected.
P0300 - 001 Upper Limit Exceeded.
16686 - Shareware Version. To Decode all DTC's
P0302 - 001 Please register / activate

Take it the second code is for cylinder 2 but its not a registered copy.

Any ideas. Didnt realise the second was to do with the car but with unregistered copy

Crasher
23-07-2009, 01:07 AM
“16686 Cylinder 2 misfiring detected”, probably the coil for cylinder 2 then…

saabsalltheway!
23-07-2009, 08:15 PM
if you think its the coil and want to make 100%sure do this
crear the codes then swap coils 1 and 2 run engine for half hour then rescan the engine and see if the miss fire has moved to cylinder 1
hope this helps
paul

Crasher
23-07-2009, 09:22 PM
Good idea but the only reason I don’t suggest this is that removing the coil pack often causes them to fail, especially if you don’t have the correct puller.

russdeebrown
23-07-2009, 10:05 PM
All sorted. Got a genuine coil pack with the -R at the end of the part no.

Just had to work out what cylinder 2 was, what was easy by the process of elimination.

For anyone else, with a similar problem. It appears that cylinder 1 is at the very front of the car moving backwards.

Can someone else confirm the sequence of the cylinders.

Thanks for everyone help.

Russ

Crasher
24-07-2009, 03:24 PM
Ohh err 1, 2, 3, 4 front to back with the firing order being 1, 3, 4, 2.