symptoms of split intake manifold gasket

[james walker]

im pretty sure ive an air leak coming from the inlet manifold area, im experiencing high fuel comsumption, and poor air to fuel ratios... what would be the symptoms of a split intake manifold gasket guys, im hoping the issues im seeing are down to this as i have a phenolic gasket to fit??

would a split cause high fuel consumption?

cheers in advance

 

[LEE69]

To make sure when the car is idling spray carb cleaner around the inlet, if the revs rise you have a leak.

 

[james walker]

done this, doesnt seem to raise the idle.... but does bubble around the inlet... probably due to heat??

positive its coming from there though

 

[adam cupra 20vt]

I changed my inlet manifold + gasket yesterday for a performance one, I very much doubt the gasket has gone as there a really strong gasket [sort of a metal composit, not cheapy gasket]

I also changed my injector seals, maybe this is your problem?

 

[Willie]

done this, doesnt seem to raise the idle.... but does bubble around the inlet... probably due to heat??

positive its coming from there though

Bubbling would indicated leaking air.
Make up a weak solution of water and washing up liquid, put this into and atomiser.
Start your car and spray this on the piece you suspect to be leaking ie inlet gasket.
You will be able to note the leaking areas as it will 'bubble up'

We use this for noting leaks when pressure testing with air/nitrogen

 

[james walker]

did this with brake cleaner willie, sprayed around the inlet manny where it meets the block, and it bubbles up, lots of tiny bubbles on all 4 cylinder areas. would this indicate a leak, not just the manny hot?

sprayed some on the hot rocker cover and this didnt bubble.

 

[Willie]

If you can easily try what I mentioned, if this bubbles then 100% it's obvious its air and not heat as it blows big bubbles that cannot be confused with 'fizzing/boiling'

 

[james walker]

nah, no bubbles there willie....

definatly a tssh tssh noise intermitantly coming from somewhere though.

 

[Willie]

nah, no bubbles there willie....

definatly a tssh tssh noise intermitantly coming from somewhere though.

Did you try the washing liquid solution?

 

[adam cupra 20vt]

Don't have petrol stains on manifold do you James?

 

[DannyC87]

Don't have petrol stains on manifold do you James?

It not one of the vac pipes coming off under the inlet mani is it?

 

[adam cupra 20vt]

Could be, theres 2 big ones in the middle 2 small ones on the end + one on side for brake servo?...the big one furthest drivers side is prone to splitting.

I only said injector seals as thats what was wrong with mine

 

[Damoegan]

Thought you had a Power Gasket to fit, James?

 

[DannyC87]

Could be, theres 2 big ones in the middle 2 small ones on the end + one on side for brake servo?...the big one furthest drivers side is prone to splitting.

I only said injector seals as thats what was wrong with mine

Most of those hoses under mine were split; I replaced the lot with silicon vac pipe

 

[james walker]

Thought you had a Power Gasket to fit, James?

not got round to it yet damien... its getting replaced anyways, just trying to rule out some obvious things for my lumpy runing, retightened all fmic hoses today, some had worked slack and it runs infinatly better now, bag of spanners when cold, but good when warm, theres a definate hissing somewhere and its still running lean

 

[Damoegan]

Intake gasket is only a 30 min job.

 

[james walker]

i know mate, just weather been gash and time is short at the minute.

monday itl be on.

 

[Willie]

Remember to give all round it a GOOD clean prior to removing this as everythiing will fall in above the cylinders = not good

 

[james walker]

yeah, ill give it a good spray with carb cleaner and the hoover prior to fitting.

any other tips on fitting willie?