EML and rough idle

[jmblack]

I'm not at home and wife has called to say that that "there's an ornge light on the dash and the car is revving itself when stopped". I think this translates to EML on and rough idle. Seems to be running OK

It's on a 2006 Dame Edna Estate, 2.3t auto with 80k.

She's going to take it to the dealer and get it plugged in.

Any best guesses - would this be first symptom of a faulty DI cassette?

Mnay thanks!

[RussJ]

In my experience its unlikely to be the cassette. They don't usually throw a CEL and when mine was failing,  it caused high speed misfires rather than a lumpy idle.
Could it be a faulty lambda sensor?
If you have an OBD reader you could pull the codes which ought to give you a clue.
Or take it to your local dealer and hook up to thier Tech2.
Russ

[jmblack]

Thanks for quick reply - off to dealer I think for a read of the code.

[jmblack]

Local dealer too busy to do today, but will do tomorrow for one hour's labour.......

Does it not just take 5 mins to plug and read code.................

[Max Headroom]

Good luck Jmblack - dont forget to fill us in on the conclusion 

[jmblack]

My wife said the car's running fine except at idle when it is intermittently revving high. Not a problem except when she was queueing in a car park when everyone else had her down as some crazed impatient nutter.......

[sgould]

Could be many things.  But a check on the vacuum pipes and non-return valves in the breather system or the EVAP system is DIY.

[jmblack]

Thanks - will have a look at that tomorrow in the daylight before going to the dealer. Have had a chance to try it tonight and what seems to be happening is it is nearly stalling at idle then there's clearly a quick push in the throttle and revs peak up to about 2000 then settle down before trying to stall again. Under throttle and in use it's fine.

[TomPaine]

It's funny how dealers differ in this regard. Others have said, similarly, that dealers charge labour etc for a Tech 2 readout - and given that the kit costs it's not inherently unreasonable. But I must say my own local one has never done so, no doubt rightly calculating that when they say, "it's the DI, it's failing, we've got one on the shelf, £xx.xx fitted", I'll just say ok then and trudge to the coffee machine for a refill.

[jmblack]

Which is why for most servicing I use local independent who unfortunately is not a saabspecialist.... He did manage to get my last Saab through 130k without drama but he doesn't have tech II. Im sure they'll do me a "free health check" to identify other work I should get done and probably wash the car too. Super!

[jmblack]

Umpteen different error codes that were misfire related. Turned out to be a simple poor connection on crankcase ventilation hose. Nothing worn or split which is all I could look for - needs to be obvious for me to see it. Simples....

And for £70 + VAT I have a couple of amber advisories on my discs (they've been like that for a while....) and a washed car.

[jmblack]

Not that simple - home this evening and its a revving monster on idle again.....

[jmblack]

Had a look myself yesterday and found the problem. Not a vent as the dealer said, but what looks like its a vacuum system for the brake servo? I'm at limit of my competence I fear. There's a t-join on a hose running from the brake servo at 12 o'clock as you look at the engine. The bit that's popping off is on the vertical part of the t just below what I think might be a one way valve/diaphragm. I've firmed it up by attaching with cable clips to the larger air intake. dealer repair was to place it back together without resecuring or trying to assess why it popped off in first place.....going back today to get light reset and ask what they can do to repair properly.

Any one got experience of this popping off? Does it Suggest the valve/diaphragm is not working and pressure is forcing it off? Or just a loose connection through age? Can you get a replacement for the section of hose and the diaphragm on its own and, if so, whee from?notxsure what to call it...

Any help appreciated!

Thanks

[sgould]

It should all be one piece of hard plastic.

One branch goes to a silver vacuum pump under the big inlet pipe.  Vac pump is driven by the camshaft.  It's only on autos and it assists the sucking out of the air from the servo.  The other end goes to the inlet and only gets suction on overrun.  When the turbo is blowing and the inlet is at positive pressure, you don't want this pressure  getting to the servo.  That's what the non-return valve is for. 

So I assume the pipe is broken and pops apart when the turbo pressure gets to the break.

[jmblack]

Correct - just below the non-return valve it's detaching from the short (about 1") of hose. It slots back in but there's no "grip" to stop it popping back out as you suggest. The definition on the workshhet from the dealer of "crankcase ventilation fault" seems a bit inaccurate.......

I've got it fixed in place with cable clips which seem to be working for now.

Dealer says they can't find the part on the computer so they're going to SAAB UK parts (or whatever they are now) to ask them what they can supply. Awkward always seems to equate to expensive..........

What woulds it be called - is it servo vaccum hose? Trying to see if I can get one elsewhere?

Many thanks

J