Trying to diagnose a new engine noise - help would be great! - Mazda Forum
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post #1 of 1 (permalink) Old 02-23-2019, 05:37 AM Thread Starter
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Trying to diagnose a new engine noise - help would be great!

Hi all,

My 2007 Mazda 3 MZR (diesel) has just started with an unusual whine/squeal upon a cold start; it lasts for a few minutes then disappears - can anyone tell me what is causing it?

Auto admin says I can't post links yet (fair enough) but I've uploaded a 30 second vid to Youtube. You'd need to add https:// to the below:

A couple of points:

1) I had some electrical problems a little while ago and the car still needs the idle reset - I'm assuming that rough as balls sound has something to do with that

2) The video was taken at 5am, which is why it's pitch black. I started the car and moved round to the engine to get a clearer sound, which is why it gets louder.

The car has 190,000km on the clock and has had a hard life (I'm in rural Australia with dust/dirt roads etc) so I'm expecting something to need replacing at this point. Injectors were replaced about 50,000km back. The noise only appears on a cold start, lasts for a few minutes then disappears - there is no impact on performance.

If it's a straightforward pull part out/put part in issue then I'll do it myself but anything vaguely resembling complicated and it'll be off to a pro. Any help pinpointing this would be very greatly appreciated by both me and my poor empty bank account.

Thanks folks

MattNSW is offline  
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