The Air?

Well air quality can affect how a petrol engine runs, so I would expect it to have a similar affect on a diesel. I can't see it being the answer to your problem though. Mike.

Probably nothing to do with it but my Citroen HdiSX diesel developed a horribly knocking rattle under load over 3000 rpm. I feared the worst but it turned out to be a knackered crankshaft pulley (which has an internal shock absorber) that had failed.

Tim

Yes. On cold crisp dry mornings the denser air can make a car feel more powerful and responsive compared to a hot humid day.

I can't see that the air would be responsible for that though.

Not just feels more poweful, it *is* going to be more powerful.*

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And jolly nice it is, too. All frisky.

All of the turbodiesels I've driven *love* cold, misty mornings in comparison to warm afternoons...

And going past just about to explode oil terminals gives that real boost.

Bad wording on my part. I meant that the difference in power is significant enough to be felt rather than a tiny theoretical change

I really hope thats not it because i've been there and done that and bought the new 125 quid part quite recently.

My local mechanic has used a stethoscope like device (maybe actually a stethoscope) to pinpoint a chirping noise that nobody here could/would identify a while back, which I think must be from the same source at different speeds. That seems to be coming from the top - the region of the camshaft pulley. There isn't much written about those though.

although this maybe true i prefer the warm weather which increases my mileage per gallon and makes my car run a lot smoother.

Ah , but I have the climate control on in warm weather so that reduces economy

It must be the same for petrol cars as inevitably air density is higher (this I guess detected by the MFM to trigger extra fueling). But turbo cars are probably more sensitive (why they can have intercoolers). In hot weather with slow traffic can turn into a real slug..!

On 14 May 2006 11:48:36 -0700, I waved a wand and this message magically appeared from snipped-for-privacy@yahoo.co.uk:

That's why you get a car with a BFO engine ;o)

The 405 with it's unshielded K&N cone filter ran like a pig till you got moving on really hot days, drinking only that red hot engine bay air till a bit of flow got going and the feed could do it's job.