Glanza Cat/manifold

[Perkins]

As you may tell from the title, i have a problem with disappearing bolts.

I'm not very good with cars, but the best way i can explain it is that its the bolts which hold the cat onto the exhaust manifold from the engine.

Its on an EP91 Glanza.

Anyone have any ideas why this keeps happening? I've had them done at the garage before and am angry cos i'm gonna have to go again.

Also, how can i change the tickover revs of the engine, cos its revving wuite low whilst idleing, and is vibrating quite a bit.

Cheers.

Rob.

[philmel]

The bolts can possibly be lock nutted ,that is two nuts on each thread tightened against each other/and or a spring washer added.