Rumble/growl Under Hard Acceleration

[pdaly]

I have a strange problem with the galaxy.... when you put your foot down and accelerate hard, there is a strange loud noise coming from the centre/left hand side of the engine block.

 

Cannot hear it when at standstill, only when under load. So it’s hard to determine the precise location. It happens at any speed, in any gear. ....foot down, turbo kicks in and the noise is there from approx 1700rpm all the way up to the redline.

 

The best way to describe the noise is that it’s growling. It sounds like a golf ball rattling/resonating in the air ducts (low pitched rattle/rumble and someone’s taken off the air filter cover (deep echo rush of air). In my mind it sounds like the turbo is rattling like hell or a pulley is slightly loose and vibrating as I put my foot down.

 

I have taken the engine cover off, manually inspected the turbo pipes, can’t see any splits, tried to feel underneath the pipes, no spilts as far as I can feel. Also checked air filter box, ensured ducting connected and foam padding fitting correctly around intake.

 

Anyone know what might cause this noise? I did read that maybe turbo spindles are worn. Or injector issue. Or even engine mounts. But to be honest I’m scratching my head with this one as there is nothing I’ve researched that points to anything obvious.

 

The car is a 2007 2.0 tdci galaxy with 150k on the clock and has barely had any issues in the last 10 years except for corrosion in cooling fan cable and lights blowing more frequent than normal.

[BrianH]

Don't know if the mk3 is the same, but there is a bearing on the drivers side driveshaft (it supports it just above the inner cv joint). Are you sure it isn't related to driveshafts and is definitely from the engine? (the bearing is screwed to the back of the engine roughly in the middle of the car if its the same as other fords?)

[pdaly]

Symptoms suggest engine related as it only happens under heavy load, regardless of gear or speed. Otherwise it runs smooth.

 

I did see a video online showing similar noise in similar acceleration and it turned out to be a faulty injector causing it to misfire upon hard acceleration, but fine on idle.

 

I’m hoping to try plugging in the elm32 with forscan to see if there’s any errors and check the graphs on the injectors. I’ll double check the turbo pipes too.