f7p kangarooy and cuts out

[frazeb]

iv only got the downpipe on at the moment will that affect anything because when im driving at low rpm it kangaroos a bit then cuts out when i stop at lights or a junction, i had this same problem with a bmw i used to have that turned out to be a hole in a intake pipe

[Bodyman]

What's the idle like ?

[T.J.]

What sort of fuel system are you using?
Where's the pickup?
what size pipe?
what type of pump?

[frazeb]

ok, slightly lumpy. erm im not sure the answers of an of those questions, i just had a new crank sensor do you think they could have put it in wrong cauing these problems or something along those lines

[T.J.]

Was it ok before you had the work done?

[frazeb]

i think its the hg thats gone im getting water out the exhaust and when i rev it loads of bubbles in the radiator

[T.J.]

Ohh, doesn't sound good.

Ways to prove it:

1)Have a look for milky residue in the oil filler . Chances are it's gone between a combustion chamber and waterway though so you might not see anything

2) Have the plugs out and look for dodgy colours/water deposits. You can also spin the engine over with no plugs is and see if water flies out

3)get a compression test done.

[frazeb]

got some milky residue on the filler cap and a small puddle out the back of the exhaust and i took the rad cap off sand revved it and there was loads of bubbles

[Speedy88]

Yep sounds like BHGF. It's not too bad on these, but you'll need to go to a machine shop and get the head skimmed as they're alloy before you put a new gasket down.

[frazeb]

will it be ok to skim again as it was skimmed last year

[Speedy88]

As far as I understand it, skimming alleviates slight warping by making the surface flat again? So unless it's warped in exactly the same way, different bits will be cut.

Basically I don't think you've got a choice, you may as well try.

[frazeb]

i see what you mean