Hi all

Need some help with my 99 Turbo 2000 Wagon. Its completely standard, no mods or remaps (old git with family!) last week its started stalling at roundabouts, hot or cold, no real pattern. Also when idling in traffic the revs are very "lumpy" and it seems to be hunting for the correct idle speed.

Runs absolutely fine at speed, still accellerates well and makes progress as normal (its done 114K now as well).

Had this problem years ago with my 205 1.9 gti (did I say I was old) and it was cured by cleaning the air flow meter which was mechanical. Just took mine out of the scooby and its a passive thing that sits in the pipe so there is nothing to clean. (I assume the acronym MAF is the same as what us oldies call an air flow meter)

Have tested the battery and alternator and voltages are all good although when the idle drops the voltage drops but I dont think the standard scooby alternator is designed to work below 600 rpm, above 1000 the voltage is a steady 14.2 Volts so I don't think its a battery issue.

What other sensors could it be (and where are they in the engine?) I am guessing they will be on the crankshaft, turbo, and the bit the accellerator cable is attached to. But there are probably others.

I also note that the exhaust smells a bit rich and that also makes me think the Lambda sensor may be a bit cooked as well (where is the lambda sensor?) although I do a lot of Mway driving (500 miles a week) at a reasonable pace and fuel economy is still much the same (29 ish mpg same as when I got it with 45K on the clock)

Is it worth trying an ECU reset by taking the battery off for a couple of hours?

And the dreaded prices, what do air flow sensors, Lambda etc cost?

Many thanks

Nathan

 

sounds like the maf needs replaced

easy on your model

 

Does sound like maf. Had this prob with mine on weekend. If revved upto 3/4k and then back off it drops to almost stall point before bouncing a few times back to normal.

around £80 from Subaru. You'll need a security Torx bit to remove the maf (Sold in sets - £8 from motor factors and £17 from Halfrauds)

It may have screwed your Lambda sensor too which will make it run rich and a little lumpy off-boost.

Am off to change my Lambda sensor now.


Bob

 

I think it is the MAF, absolutely no other running problems except the irritating idle, and even that is variable.

Getting a new MAF this week to see if that sorts it.

 

Make sure you take it easy.

 

Where is the Lambda sensor on the Subaru, I recall from my Peugeot it was a real pig to get at and the same with a Vauxhall I had

 

On the downpipe where it connects to the turbo. There will only be one plug coming out of it.

Bob

 

same place as on my 205 then, working a bit blind on the Scoob as I dont have a haynes manual for it

 

Update time

Got the MAF throught eh post this morning, went to fit it and saw I need not just a normal Torx bit, but the ones with a nipple in the middle.

Off to Halfords magestore thingy down the A1 and the words chocolate tea pot spring to mind.

Whilst there would be no problem chaving up a Nova so it looks like a spaceship and sounds like an asthmatic dalek do you think I could get either the tool, or a vague idea where to get some from. Nope, it was like trying to raise the dead, even Doris Stokes would have had trouble getting something out of that lot.

The guy I spoke to would have trouble blowing himself up if he walked into a live minefield.

Luckily, local garage just did her indoors Merc so I popped in and the nice man there will loosen the nuts and retighten them so I am off down there to get it done.

Woosah......

 

Did this work after changing your maf or did you need to change your lambda sensor too ??

ta.