Quote:
Originally Posted by tim_s
Congratulations on the purchase! Did you go for new injectors? How noisy is it on idle? I'd definitely reflash over the inlet manifold, having said that I never ran mine with a 330 map and 325 inlet, but my suspicion is it makes far more difference even at low rpm and part load than the disa valves. Changing the inlet manifold is a good opportunity to have a poke around to see whether the inlet ports are coked up however.
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Cheers! So when I bought the car, it had a rough idle from a cold start - it'd start absolutely fine, then within a second or two 'go rough', then get a bit better once the engine had warmed up - it was pretty obvious that there were one or two cylinders that had a problem so decided to take it to a BMW specialist a friend recommended (BMS Surrey) who took a look. They confirmed that I needed 2 new injectors, turned out that they were both index 4 and the rest were index 11 - so I had them put 2 new index 11 injectors in. After that, it's running smooth.
It was 'noisier' on idle prior to the new injectors, mostly because you could hear it was running rough (as well as feel it in the car, and see/hear/smell it at the exhaust) - now it's actually pretty quiet but you can hear (what I think are) the injectors ticking - but it's not loud. I hope the rest of the engine is in good health, it seems to be at the moment!
I'd certainly need to take a look at the inlet ports, I imagine they're pretty grotty but I'll probably wait until it's a bit warmer out! If I do go for the map (more likely than not) I'll try to get hold of a manifold, but will do it without if there isn't one available at the time. I hope it'll also improve the economy a little (hovering around an average of 25MPG at the moment according to the OBC), I also have a Z4 3.0 with the old M54 engine - it's less thirsty and noticeably quicker but then it's also more powerful (at least compared to the current N53 tune on the 325i) and probably a bit lighter.