reeeeally bad idle that dies after a few seconds...

[alxlaw]

its fine to drive just so long as your foot never comes off the terror pedal, i cant get to pips till next weekend  so was going to have a peroooz myself - the idle screw on the side of the inlet will upp the idle breifly but then goes down to 400rpm then dies.... im aware of a hissing/air leak behind the schmintercooler so was gonna rip that off tomorrow and have a gander anything i should be looking for? whats behind there anyway? and what the hell is a ....le engine anyway? lol!:yes

[L18M]

http://www.mazdarotaryclub.com/forums/showthread.php?t=58840&highlight=doritos

in short:
1) magic
2) 2 doritos on a stick :rollin

the latter one is the best :rollin

[Prof]

its fine to drive just so long as your foot never comes off the terror pedal, i cant get to pips till next weekend so was going to have a peroooz myself - the idle screw on the side of the inlet will upp the idle breifly but then goes down to 400rpm then dies.... im aware of a hissing/air leak behind the schmintercooler so was gonna rip that off tomorrow and have a gander anything i should be looking for? whats behind there anyway? and what the hell is a ....le engine anyway? lol!:yes

That\'s almost definitely an air leak you\'ve got there - possibly from main throttle inlet to intercooler hose, or it could be one of the wee hoses from the back of the intercooler that dissapear down the back of the throttle body.
 
In any case - you\'re getting unmetered air which is what kills your idle.  If you up the revs (by playing with the thottle, you reduce the fuel/air inbalance so it runs.
 
Getting the intercooler off isn\'t too difficult - I am pretty sure you\'ll find what\'s wrong having done that.:Thumbs-up

[alxlaw]

http://www.mazdarotaryclub.com/forums/showthread.php?t=58840&highlight=doritos

in short:
1) magic
2) 2 doritos on a stick :rollin

the latter one is the best :rollin

lol!!! i was being silly i have a vague idea how it works lol!

That\'s almost definitely an air leak you\'ve got there - possibly from main throttle inlet to intercooler hose, or it could be one of the wee hoses from the back of the intercooler that dissapear down the back of the throttle body.
 
In any case - you\'re getting unmetered air which is what kills your idle.  If you up the revs (by playing with the thottle, you reduce the fuel/air inbalance so it runs.
 
Getting the intercooler off isn\'t too difficult - I am pretty sure you\'ll find what\'s wrong having done that.:Thumbs-up

RIGHT in which case im off to rip the intercooler off see you in a couple of hours!!!

[m1tch]

Im thinking split/perished pipe at the back of the intercooler

[alxlaw]

uuuggg..... all went a bit .... got it off easily enough and found a pipe just poking about, had a bit of a search and found what looked like the right place for it to go put it all back togeather feeling really pleased - had made no difference, stalled strait away, so off it came and i took some pics of said items -

this is where it looked like it wanted to be connected to (1 of three pipes life there)



this is of the pipe in situe and where it was found and the direction it wanted to go in to find the above \'male\' pipe (lol) -




and this is where it is in relation to the rest of the engine if it helps



anyway i screwed a screw in the end of the pipe to see if that helped - didnt

had a listen and the leak seems to be coming from nearer to the idle screw than anything, couldnt see anything untoward there either and in the 2 hours of tinkering i had the engine on for less than 5 mins - and its given me a huge headache and i feel sick   - so gassing me for fun again as usual - pos!

[m1tch]

There should be a row of solinoids along the side of the oil filler neck, they are different colours, are they all connected up?

[alxlaw]

i shall check 1 min............

[alxlaw]

yea all the solenoids have a wire coming from each individually and at the end there is a big plug dangling around next to the expansion bottle?

[alxlaw]

lol! checked wrong ones.....brb (i checked the ones in the front bumper.....)

[Prof]

Sorry to hear you gassed yourself
 
On both the front and back of the throttle body, there are several vacuum pipes.
 
On the back - which sounds like where you\'re leak is coming from, there is a short pipe that goes to a 4 way divider - this is called the vac spider - and feeds vacuum to the oil injectors.  It\'s under the upper inlet manifold so you won\'t easily see it.  There are also 2 further pipes that come from the back of the throttle bodies and go to the injector bleeds - one to each pair.  Not sure what the 4th one does - I think it may be connected to the warmup stuff on the throttle body - as I\'ve still got all 4 on the back of mine and still have that connected.
 
Looking at one of your pics - one of the above hoses has come off for sure - you shouldn\'t have any of those pipes uncapped or not connected on the throttle body - as that will leak vacuum.
 
I\'ve attached a diagram that I hope will help.

[alxlaw]

cheers prof, yea that kinda helps, hope pip doesn\'t want another million pounds to fix this one!, iv put the vac pipe back on, im gonna leave it alone till i take it down on the weekend dont wanna mess it up anyfurther

[alxlaw]

well came back from wgt, was a pipe round the back where prof\'s diagram shows - it blows off everytime i drive it......hmmm.....  im hitting fuel cut at 0.75 bar randomly and this is what knocks it off, it goes on the metal bit you can see in my pics, so whats the answer?? once the pipe has blown itself off i no longer hit fuel cut and it keeps pulling but dies when it tryes to idle...................................................... grrrrrrrrrrrrrrr!!!!

[Prof]

That makes sense.
 
It\'s a small vac/boost leak so under idle conditions it will allow unmetered air in and this will kill the idle.
 
Under boost, it will leak some of the boost limiting the pressure the MAP sensor see\'s - which means you won\'t get fuel cut.
 
Those pipes are only push fit, so if it\'s that lose the hose needs replacing - the ends to expand over time.

[dthebuk]

sounds like you could do with an fcd aswell