thumping from engine bay @ idle

[Jon_VXR]

hi guys,

Quick question for you before I take the ol' girl to the garage.

When I've been sat at the lights a few times recently, I've heard what I can only describe as a thumping noise coming from the engine bay. It happens once every say 5 seconds...then settles down again. It may happen when not idle, but haven't heard it.

Seems to be happening more and more recently... but it's probably just 'one of those things'.

I've checked under the bonnet and haven't found a midget lurking, so any ideas appreciated.

thanks in advance

Jon

[Boosted LS1]

Loose engine mount perhaps. If it's not the engine then somethings moving about. Can you get somebody to look in the engine bay while you blip the throttle?

[crisisjez]

You may just be experiencing drivetrain gremlins caused by the LSD. I had something similar that sounded like it was at the rear of the engine bellhousingwise. Some molyslip cured it.

[Wolfracer]

Alot of cars have an uneven idle which every so often because of the firing order (like you say 5 secs or so) gives a big rock of the car - this coupled with a loose engine mount could account for the thump??

[CV8GTO]

Hi

Try having a look for a loose spark plug lead. I had one come loose and at idle was causing a tapping, it was not firing correctly but under load was sparking and firing no probs.

[Jon_VXR]

Thanks for all the quick responses, will let you know!

[MyM8V8]

Yeah. I got this too, it was terrible! I just increased the idle to about 850 and it doesn't knock me about as much now.