Misfires and Engine stuff

[ulfilias]

Hi There,

Originally Posted by sloss

It's interesting a plug can blow out but leave the thread OK.

Seems it was never tightened properly and managed to unscrew itself.

The 15k plugs etc - why did you have/keep them?

The car had been running fine and untouched on the engine for about a year or so, which came as a big surprise. The coil pack was destroyed (2 pieces) and the plug was clear of the engine.

The older plugs were from when I had timing issues with the cam tensioners a long while back and the engine was partially rebuilt and serviced. I got a new cam belt fitted as well at the time, though the current one had only done 20K on the basis that fitting new made sense since the labour was paid for etc......I'm a bit of a hoarder of old bits that 'may come in useful'

[Dezzy]

I'd double check the thread in the head, that's easier said than done i know. Hopefully it is deffo ok and something else has caused it but sounds like the plug has been shot out.

[ulfilias]

I'm fairly certain the thread on cylinder 6 is fine. The plug went in with ease and tightened up all ok!

Interestingly just swapped Coil Packs 6 & 7 and that fault went to 7!

[ainarssems]

There you go then - it's faulty coil pack.

[ulfilias]

Hi There,

Swapping 7 (faulty) for 8 moved it to 8 too.

Just been on a lumpy journey to TPS and got an new audi coilpack (06B905115E) and we'll see what that does. Interestingly looking on ebay for that gives loads of other cars with that model, but the compatibility checker rarely gives up an A8/S8....am presuming the checker is wrong. Am tempted to get a cheap second hand one as a spare!

Lee

[ulfilias]

Hi There,

New coil pack and the missfires have gone.....However I've just gotten this instead ???

17924 - Intake Manifold Valve (N156) : Open Circuit

Have I knocked something ??? Or is this a new or related issue ???

Lee