Got a strange noise.

[Jakeymd]

I've had a strange grumbling noise coming from my engine. But it is only when the car is cold and just after starting or if there is an ancillary/electrical load. When the engine is warm the engine sounds normal, but if i turn on the lights, heated screens or air conditioning or other electrical loads the noise starts. As soon as it is turned off it stops. When i have my indicators on the noise will intermittently start and stop along the the indicators. Any ideas what it could be?

I think it's something to do with the ancillary belt stuff, ie idler or alternator. I have had a charging test done and it is charging the battery okay.

 

[Loz]

Worn bearing in the alternator maybe?



I didn't get that idea from wheeler dealers, honest.

 

[Jakeymd]

Will this be easy to check if I take the alternator off and have a look?

 

[turbonutter69]

Have you had the bonnet up and had a listen?

 

[Jakeymd]

Yep, there was definatly a noise

 

[turbonutter69]

Yes but which part of the engine?

 

[Jakeymd]

It was fairly hard to tell where it was coming from over the noise of the engine. It's a deep rumble so it's not very directional. By which I mean it's hard to tell where it's coming from.

 

[turbonutter69]

I'd suspect the alternator but couldn't be sure without looking/hearing myself.

 

[Prince]

Does the engine use rollers for the belt? It could be one those as they have a little bearing inside as well.

 

[Jakeymd]

Do you mean a tensioner/idler?

 

[Prince]

Do you mean a tensioner/idler?

They're rollers on my engine but yeah idlers would be the same.