This thread will be dedicated to the C18NZ - a cracking engine when looked after (as with any engine really)
I will update the thread as and when I find new things (and when I have time to type all the things I've learned so far.)
I use the following when doing a full service
5w40 Mineral Oil from Halfords / 10w40 Semi Synth GM (£13 on trade
)HAL201 Oil Filter or VOF93 (£1.50ish trade)
GM OEM Plugs (£4.85ish trade)
Bosch HT Leads (Halfords Trade Card - £17 as opposed to £34)
Genuine GM Panel Filter (£5.60ish Trade)
Top tip 1.
If our car is idling roughly try removing the pipe from the EGR valve and blocking it with your thumb to see it it improves at all - worked wonders with my idling. Permanently blocked the pipe up with a trim screw.
Top tip 2.
Check your oil breather pipes - Mine where filled with so much crud they will all have to be replaced in time - make sure the pipes aren't cracking at the ends as this can lead to problems later on (i.e. bursting hoses).
Tip 3. Submitted by Shrink.
another tip...
there's a pipe leading from just above the manifold back into your air box, this helps with cold starts and pulls some warm air back into the engine, but the rest of the time it can end up trickling small amounts of warm air back into your breathing system
so try taking the hose off the manifold cover, and routing it into the front of the car so that it gets a cold air feed, doesn't do any harm and in some cases can do some good.
More to come..
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this is fantastic, i think i'll have to employ some manners soon