Hunting idle, then a stall...!

[s2driveruk]

Hi,

Fitted a new starter motor to cure that problem over the weekend (a How to will appear shortly) but seems that a new prob rears its head... When the car is started the idle would normally sit at 6-700 but its hunting for a couple of secs before finding the level.

I took the car out for a quick spin, on coming up to a roundabout, dipped the cluth on pulling to a halt and ......stalled

I think it must be to do with either:

ISV?
Lambda?
possible air leak?

Can you suggest anything else to look at......? My instinct tells me its the lambda as the fuel consumption has been creeping up a bit recently but any help appreciated.

Cheers,

David

[Greg_S]

check your ISV and give it a clean and also your lamda. Had a similar prob with mine sometime ago.

Greg

[rotoryboy]

check your ISV and give it a clean and also your lamda.
Greg

What does the ISV look like? Where is it? (sorry to sound stupid) Mine has just started doing the same.
Thanks
Mark

[s2driveruk]

look towards the centre-back of the engine bay, there will be a metal cylinder directyl above and behind the IM.....so where the black inlet pipe runs along the rocker cover, then there is a small rubber section and a L shaped metal pipe which connects directly to it It connects to two rubber hoses, the one off that small diameter metal L pipe and one directly below the ISV.

HTH,

David

[Stick Insect]

ISV?
Lambda?
possible air leak?

Can you suggest anything else to look at......? My instinct tells me its the lambda as the fuel consumption has been creeping up a bit recently but any help appreciated.

Cheers,

David

David I have been having problems with poor fuelconsumption on my Mondeo 100K. The mileage has been down to 16 MPG and is about 22 normally. I have just swapped the Lambda sensor and it is miles better. on Saturday I swapped the fuel filter and another massive improvement.

Lambda sensors seem to last about 100K. I bought a 4 wire sensor from a Ford specialist and changed the plug to suit my Mondeo. it was £20 instead of £75 +VAT from Ford. The £20 sensor was made by Ford anyway!

I would suggest a fuel filter as they are about £5. It could be well and truly blocked. This in turn could lead to poor fuel delivery and also pump failure.

The Audi has a steel tank whereas the Mondeo has a plastic one which does not rust. My audi has a 3 wire sensor.

HTH

David

[s2driveruk]

Thanks david......will check them off :-)

David

[blu_s2]

Very simple one but have you reset the ECU (fuse pull). On the ABY it seems to have a learning idle which sometimes needs 're-learning' *may* have got upset during the starter motor failure.

[s2driveruk]

oh interesting - no havent tried that, which fuse is it, do you know the number and I'll give that a shot.

cheers,

David

[APNess]

26/27 orange covered ones.

[s2driveruk]

Also, is it possible to change the lambda without using the special, specific socket?

David

[martinjs]

David, if you remove the airbox you can get at it with a 22mm spanner, you have a cone though dont you? should be easier

martin

[s2driveruk]

cheers, yes i have a cone so access seems to be fine...thanks martin

[s2driveruk]

Hi, car is now back to how it should be, changed the Lamda which is a true 5 minute job if you dont have an airbox, took her for a spin and holly sh*t i have sweet boosting across all gears and noooooooo hesitation and lumpy idle/stalling. Nailed the nuts off it last night just to be sure all was well However this morning, boosted to .8bar then a strange almost beeeeep sound. On arriving at work realised that i had clean blown one of the jubilee clips of th short section of samco leading up to the rocker cover.....so i guess i am creating peak boost

Pics to follow on the lambda, the original bosche one was superceeded with a nkt (or something) as recommended in the bosche parts catalogue...they dont look the same but it sure works!

Cheers,

David

[s2driveruk]

old versus new.....old on the right

[Stick Insect]

old versus new.....old on the right

Changing the Lambda probe makes a big difference. I changed mine on the Mondeo and I have a different car to drive now! 100K miles.

David