Lambda Probe question

[pjeast73]

Hi all,
does a faulty lambda probe show up on vagcom? My fuel consumption has dropped by 1-2mpg and I feel a very slight 'surging' at constant throttle and a very slight fluctuation in rpm at idle.
Is the lambda the first likely suspect? Anyone know the price of these? Are they from Vagparts?
And if I do proceed, if this an easy job - or am I going to see Tim (QRSports) again?
Cheers

[rotoryboy]

I would clean your MAF and ISV first

[pjeast73]

just picked up a bottle of IPA - plan on doing the MAF tonight. what's the ISV? and where is it? and how is this cleaned? is there a thread already on this. I'll try a search. thanks

[pjeast73]

OK - the search came up with - close one end and spray WD40 into the other. is this correct - but still don't know where it is (ISV). can anybody help on this. will aim to do both tonight.

[Billman]

Idle Stabilization Valve! It is a round thing near the Inlet manifold at the back of the engine!It has 2 hose connections and a cable!

[rotoryboy]

This is the ISV

[pjeast73]

thanks guys! will report back if these make a difference.

[porkkis]

Bad lambda tends to enrichen rather than make it run lean.

[pjeast73]

ah - bad wording I think on my original post. What I meant to say was - I am getting 1-2 miles less per gallon.

[porkkis]

I'm a bit lost with your measure units every now and then and now again

[BrianSmith_S2]

cleaning ISV

Hi, visit 20v.org/engprob.htm for a good guide to cleaning the ISV. Its for the 20v 7a engine but the same guidance should work for your car.

[dan_b]

@Pjeast

A bad lambda does indeed show up on VAGCOM, and also gives you exactly the symptoms you've described: rough running, surging/hesitation at constant throttle, lumpy tick-over and less boost. I know because I've just had the same issue - you can read my thread here if this helps

http://www.s2forum.com/forum/showthread.php?t=9292&highlight=awful+running

New Lambda probe is a doddle to fit: from VAGParts a genuine item is about £70 inc VAT and delivery. Worth cleaning your MAF and ISV as well though!

Good luck, let us know how you get on.

[pjeast73]

Cheers Dan (and everyone else). Going to order a new Lambda from Vagparts - hope they can get it me quick and I'll fit this and do the cleaning at the weekend. Dan's thread does sound a lot like me - so fingers crossed.

[dan_b]

VAGparts took about 7 days to deliver the probe to me. Apparently you can get generic ones from other suppliers, but I don't know anything about that.

Good luck!

[martinjs]

Apparently you can get generic ones from other suppliers, but I don't know anything about that.

Dont bother with those, BTDT and it was a right joke. Stick to OEM.