Cosmo

Can anyone help, i've just finished putting my 3dr back together and got her running thanks to a lot of help from people on this site.

My trouble now is that she's idling around 2500 rpm way too fast. I bought some "easy start" this morning and when i spray it on the inlet manifold (where the gasket joins the block) the revs drop back down to normal for a second then raise back up again. I'm a little confused becasue i fitted a new gasket when i re-built the engine and the bolts are really very tight on it, for there to be a leak is strange?

I've got the metalic side of the gasket against the block and the fabric or whatever it is side against the inlet, firstly is this correct?

Secondly why is easy start dropping my revs? Surely it would raise them? could some of the vapours be getting into the injectors or else where etc.

I've unclipped my ISCV to see if that made any difference and nothing changed, the revs stayed exactly the same which is wierd also??

Anyone got any ideas - i'm dreading the manifold being on wrong (not tight enough or something) as the engine's all built and getting to all the nuts looks vertually impossible!!!

tabetha

The fact that it did anything shows there to be a leak, it is dangerous using easy start as it contains ether, which is mighty flamable, much better to just use wd40, you will hear a note change when it is sucked in.
The iscv may be jammed, but you need to fix the leaks you know about first, the iscv is easy to discount simply by removing and using a paint brush handle or similar bit of dowel to block hole underneath where it went, it will then only be able to draw purely on the air by pass on the underside of the housing, or any other air leaks.
tabetha

Cosmo

Am a bit concerned as i'm pretty sure your right, it must be a leak, trouble is i've been on the nuts that hold the manifold on today and i fear if i put any more force on them i'm going to break/strip the studs in the block, its clamped down pretty tight I used a new gasket when i re-fitted it, am wondering if this has been comprimised somewhere (pinched or something during re-fitting, although i cant see how?) Do you know if i've done right using the metalic side of the gasket facing the block?

tabetha

You only need a normal amount of pressure on them, any leaks after that then there most likely is a bad distortion.
I think it unlikely to be the problem as it is so simple a thing, but any leak has to be between the throttle flap and the engine so a few more areas to investigate, not forgetting the iscv itself, this also needs discounting, I assume that you have tried all adjustment on the base screw as well ?
tabetha

joffy

iTrader: (1)

had exactly the same problem when i rebuilt mine, turned out to be one of the 5 sensors etc the screw in the side of the manifold cover, spent ages checkin the little things and missed the bloody great hole infornt of my eyes lol

Cosmo

The manifold was fine when i removed the engine out my last car but i took it off and replaced the gaskets etc when i was tiding it all up so i dont think there's distortion. I figured it was the connection between the block and the inlet because when i sprayed the interface thats when the idle dropped? Still dont know why it dropped instead of risen though either?? Its a puzzler, unless i damaged the new gasket when re-installing.

Cosmo

Oh and my idle screw is solid at the moment, i undid the retaining nut on it and tried to turn the screw but its stuck fast at the moment

I did fit a new outter case (chrome) on the inlet when i refitted too (with a new gasket) it could be a problem here too, but i'm not spraying near that when the revs drop??

cosy trav

iTrader: (1)

You sure you turning the right nut there Lee . I dont think it has a nut on it , that might be the inlet damper bolt your trying to turn . Its a flat head screw in a hole right under where the inlet pipe goes on from the intercooler . I will call round at weekend if need be . Just gotta sort my cossie out , only firing on 3 cylinders at the moment .

Cosmo

Eh up mate, just got back off my holl's
I'm sure i'm on the right screw, flat head job right under the inlet pipe, no idea why mine's got a nut on it (and why its proper solid!)

Have you got your's sorted pal? Hope it was nothing too drastic?

Am taking my lad away for a few days (yes another holiday PMSL) until Saturday but then am back under the bonnet to try and sort this out, the car is so close after 2yrs of building and i'm itching to get it finished!

If i can help at all with yours fella just let me know!