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PostPosted: Sat Nov 18, 2017 1:19 pm 
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Joined: Wed Oct 25, 2017 3:14 pm
Posts: 25
Location: Lincoln
Car Model: 9-3 Aero
Hi guys,

So changed the spark plugs a couple weeks ago which resolved the judder issue under heavy load. Then a week ago I get the CEL one morning. Code comes back as P0300. On cold mornings she takes a little longer to fire up and needs a bit of right foot to catch, but idle is rough for around 20 secs, then settles.

Took her out this morning and once warm I cleared the code and it has not appeared again, but I suspect it will reappear in the morning. When I changed the plugs I put some di-electric grease on the porcelain part of the plugs (as per several YouTube vids) and wondered if this was the cause. However a Google hunt shows this could be the dreaded intake valves issue, which sounds expensive to fix :(

Anyway, assuming it is that, are there any other jobs/upgrades you folks recommend carrying out at the same time in order to save cash and improve performance? This all depends on how much the repair is and if I have cash left over of course :D

Thanks all, and sorry for the long post :oops:


2008 9-3SS Aero
Now at Stage 1 (NoobTune)

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