12 replies to this topic

[truezie.]

hi all....

im getting a hising noise (sounds like air coming out somewhere?) under the bonnet and just wondering if it is normal or somethings wrong!

its a 1988 city 998cc with an lcb

any help much apprectiated

thanks

[liirge]

Depends...what type of Air filter do you have, as the cone filters can make a loud hissing induction noise..

[shorty]

Depends...what type of Air filter do you have, as the cone filters can make a loud hissing induction noise..

sounds like what mine is doing

[truezie.]

its just the standard filter in the box thingy and the filter in side was changed like a week ago.....

oh and this was on idle and when it was reved if that would make a diffrence?

Edited by truezie., 01 June 2009 - 09:44 PM.

[wmkccwhite]

Is it running normal? If its idling a little high it could be a vacuum leak or as stated already just your air breather.

hi all....

im getting a hising noise (sounds like air coming out somewhere?) under the bonnet and just wondering if it is normal or somethings wrong!

its a 1988 city 998cc with an lcb

any help much apprectiated

thanks

[liirge]

Yer if she is running ok then, it is still most likely your Carburettor sucking air in. is the filter casing back on properly?
If there are some anomilies with Idle, and revs then there might be an Air leak around the manifold.

[truezie.]

it dosent run properly when the choke is fully in when driving...

is there any way of checking any of these?

thanks for the replys

[liirge]

So are you driving around with the Choke out? Did you have the car set up properly when the LCB was installed? sounds like its running a little lean and could do with a Rolling Road Setup.
to check for an air leak spray WD40 all around the intake manifold and carb, see if the engine note and running changes at all..

[truezie.]

sorry to bring this up again but....

when ever i went to check it it was normal again but i was driving to kfc and on the way there it was fine but on the way back it started again and seemed like it had nothing atall to give....?

i tried pulling the choke in and out ti see if it helped but i didnt :S

any ideas?

thanks

[just_st3v3n]

sounds sill but is the vacuum advance pipe connected??
its a thin pipe that runs from the carburettor to the distributor..... my first mini never had one <---lil did i know at that time

id also just check/tighten all the bolts where the exhaust connects to the engine, could be leaking gasket from there?

steven

[baileyboi_01]

May be a silly answer but just a thought.

Between the water pump and the cylinder head, is usually a small by-pass hose. I had a problem with these splitting regularly, spraying coolant onto the block and causing a hissing effect. If it did not his on the way to KFC (maby because the engine wasn't hot enough, and/ or pressure hadn't built up in the system) but did on the way back because the engine had heated up this could be causing your noise. May well not be this, but may well be worth a check.

Regards Alex

Edited by baileyboi_01, 10 June 2009 - 10:44 PM.

[zebidee]

sounds sill but is the vacuum advance pipe connected??

That shouldn't create any adverse effects if it wasn't connected.

As for the bypass hose...its main use is to allow a small circulation of coolant around the head to prevent hot spots as the engine warms up to normal running temperature, before the thermostat opens, so if it was split you would of found out straight away

Its odd that it happens on & off...obviously a vacuum leak would appear permanently. Still, carry a a can of WD40 with you and the next time it occurs just give the engine a quick spray when you can, see for the changes in note.

Also, have you had it setup properly yet? If you can get away with driving with the choke out permanently without flooding your engine its definitely running to lean! Its worth getting that sorted if not

Edited by zebidee, 10 June 2009 - 10:57 PM.

[truezie.]

thanks for the replys guys ill check all and carry some wd40

its has been set up on a computer but not a rolling road.....